Backend Development Jobs

I need a complete unilevel-based MLM system that runs primarily through an Android app and sends real-time crypto trading signals to every member—similar in flow to the SignalMax WordPress notification experience I referenced. Core experience Members should be able to register, view their downline, and receive push notifications the moment a new signal is published. An intuitive user dashboard must show current rank, personal volume, group volume, and wallet balances. I also want an admin space where I can issue signals, upload short training videos, manage plans, and monitor overall network health without touching code. Key functions we must hit • User dashboards • Commission tracking with automatic unilevel calculations and daily/weekly payout runs • Sale...

I am looking for an experienced full-stack developer or agency to build a high-performance, scalable freelancer marketplace platform. The goal is to create a site with similar functionality and user experience to Gigfy Online. The platform will serve as a bridge between service providers (Sellers) and clients (Buyers), focusing on ease of use, secure transactions, and a clean professional interface. Reference Site: Login/Register: Please check out the above website, I need something similar. You need to look at the internal dashboards and work flows of a freelancer and a client/employer.

I'm looking for a skilled web developer to create a short-term rental website. The site will feature a booking system and an investor blurb. Key Requirements: - Integrate an existing booking engine - Include an investor information section Ideal skills and experience: - Proven experience in developing rental or similar websites - Strong knowledge of booking system integration - Familiarity with creating investor information sections

I want to purchase a 100% complete, fully functional, production-ready voice chat app similar to Xena Live, Bego Live, or Coco Live in terms of all room interaction systems and monetization features. I am NOT looking for a demo, partial build, or unfinished template. I need a fully working system ready for launch, with full source code, backend, database, admin panel, and full ownership transfer, supporting both Arabic and English languages. Here are the exact requirements: 1️⃣ Professional Voice Room System Public and private voice rooms Multiple mic seats with full host/moderator control Mute / kick / ban users In-room text chat Stable, high-quality real-time voice with no lag 2️⃣ Room Bomb System Special “Bomb” gifts with full-screen animations Instant room point increase Bo...

I am looking for an experienced developer to help fix a bug in the account management system of my finance project. The system is currently experiencing an issue where user account updates and transactions are not being saved correctly, causing inconsistencies in account balances and reports.

We are looking for an experienced developer to build a custom car configurator for a WordPress website similar to the reference configurator below. Please find attached file figma Reference Example: The configurator should allow users to visually customize a car by selecting different options such as exterior colors, wheels, interior materials, roof options, and accessories. A product configurator is an interactive tool that allows users to customize product attributes such as colors, materials, and features with real-time visual feedback. () The goal is to create a high-quality visual configurator experience similar to a digital showroom. Main Requirements The configurator must be developed as a WordPress plugin and should work on the product page. Users should be abl...

Need just adjust the shipping sections and shipping variants

Ich plane ein flexibles Abliefernachweis-Formular, das sich per Drag-and-Drop wie ein Baukastensystem erweitern lässt. Kernfunktionen, die ich benötige: • Eingabefelder: einzeilige und mehrzeilige Textfelder • Auswahl­elemente: Dropdowns sowie Checkboxen für Mehrfachauswahl und reine Bestätigungen • Unterschrift: digitales Signaturfeld direkt im Formular • PDF-Erstellung: Nach Absenden soll automatisch ein druckbares PDF des ausgefüllten Dokuments generiert und bereitgestellt werden Zusätzlich sollen folgende Integrationen aktiv sein: • automatische E-Mail-Benachrichtigungen • Speicherung der Datensätze in einer Datenbank • Anbindung an bestehende CRM- bzw. ERP-Systeme Ich erwarte eine komplett ein...

Marketplace Platform for Booking Short-Term Professional Services Project Description: I am looking for a developer or small development team to build a web-based platform that connects businesses with independent professionals for short-term work assignments. The platform will operate as a two-sided marketplace where businesses can post available shifts or temporary work opportunities, and professionals can create profiles, upload credentials, and apply for or accept these opportunities. A key component of the system will be compliance and credential verification, ensuring that professionals meet the necessary requirements before they can accept work. To confirm you have read the full description, please begin your proposal with the word ‘Marketplace’. If you are an AI dra...

We are looking for an experienced Flutter developer to build Android and iOS apps for our existing LMS platform. We purchased the Academy LMS script and made some minor custom changes: The website is already running on CodeIgniter (PHP) + MySQL. The script also provides a basic mobile app APK, but we want a custom Flutter app connected to our existing backend. Main Features -Login / Register -Course browsing and video lessons -Student progress tracking -Instagram-style reels feed (like, comment, share) or like tiktok -Chat and gifts -Wallet system -Instructor dashboard -Push notifications Requirements -Flutter app for Android & iOS -API integration with existing backend -Source code + Play Store / App Store support -Please share Flutter experience, timeline, and cost.

A full business website will be built for my Kathmandu-based service company. The site must present clear service listings, showcase customer testimonials, and support separate spaces for both clients and agents. Core requirements • Dynamic service listings that I can add or edit from an admin panel. • A testimonial section that pulls quotes and ratings directly from the database. • Secure profile areas: one for clients, one for agents, each with basic editing and document upload. • A real-time booking system that lets visitors choose a service, pick a time slot, and receive confirmation emails. • Mobile-first, fast-loading front-end with clean UI; I am flexible on the tech stack as long as it can be maintained locally. • Admin dashboard to manage...

I need a full website development service focused on a complete e-commerce site and I’m looking to launch as soon as possible. Here’s what I expect: • A modern, responsive storefront that works smoothly on desktop and mobile. • Simple product catalog setup with categories, search, and filters. • Secure checkout with at least one major payment gateway ready to accept live payments. • Basic order-management dashboard so I can track, fulfil, and update orders without touching code. • Clear hand-over notes that let me update products, prices, and images on my own. Speed is critical—the sooner you can deliver a functional, customer-ready site, the better. If you have a proven track record in website development and can move fast without cu...

Laravel Developer Needed to Review and Finalize Existing POS / Inventory System We have a custom-built POS and Inventory Management System already developed and running. We are looking for an experienced Laravel developer to review the system, correct issues, and finalize it for real-world daily use in our store. The system is already functional and deployed, but requires refinement and testing to ensure everything works correctly and links together as a proper POS system should. This project mainly involves reviewing existing code, correcting issues, and improving usability where needed. About the Business We operate an automotive parts business specializing in Mercedes-Benz, BMW, Audi, VW and Toyota parts. The system manages: Inventory Sales Quotations Barcode labels Customers...

**Backend Developer – Loan Application Platform** We are looking for a skilled Backend Developer to design, develop, and maintain the server-side architecture of our digital loan application platform. The ideal candidate will be responsible for building secure, scalable, and high-performance backend systems that support loan processing, user authentication, data management, and API integrations. **Key Responsibilities:** * Develop and maintain backend services for the loan management system. * Design secure RESTful APIs to support mobile and web applications. * Implement business logic for loan applications, approval workflows, and repayment tracking. * Integrate third-party services such as payment gateways, credit scoring APIs, and KYC verification systems. * Ensure high levels ...

Apptixx Pty Ltd — MPX Client Portal (Phase 1 Development) Ownership: All code, architecture, and IP produced under this contract will be fully owned by Apptixx Pty Ltd, with unrestricted rights to commercialise, resell, white‑label, or license the platform. 1. Project Overview Apptixx Pty Ltd is developing a modular, enterprise‑grade platform designed for the construction, design, and real estate sectors. This project represents Phase 1 — the creation of a core client portal that will act as the central hub for all future modules. The platform must be built with scalability, modularity, and multi‑tenant capability in mind, as future modules (quoting, contracts, compliance, payments, AI tools, etc.) will be integrated into this core. 2. Objective of Phase 1 Develop a secure, mod...

I need a full-featured e-commerce website focused on selling service packages, specifically freelance work. The goal is to let visitors browse clearly defined service offerings, add them to a cart, check out, and receive an automated confirmation without friction. Core requirements • Clean, modern front-end that makes each freelance package easy to compare • Secure checkout flow (Stripe or PayPal preferred, but I’m open to other well-supported gateways) • Simple admin dashboard where I can create, edit, tag, and price new services without touching code • Responsive design that looks great on desktop and mobile • Basic SEO setup so the main pages are crawlable and index quickly If you already have experience launching service-based stores rather than...

I need a app development team, who can develop the app as per the requires and give me support for 1 year , for deployment and maintains especially , this is for business so its very especial for the system to be operational and if any bugs it must be fixed asap , the app will have 16 screen and admin panel also Dev budget is 50K and support is 20K all will be paid as milestones . You can use ai to develop not an issue but import thing is maintenance

We have an application based on Node JS . We need some work , intergration and ongoing work for it

I’m a developer and data scientist expanding my automation contract work and need a subcontractor to help with CRM and backend automation builds. I work primarily in Claude Code and require someone who can vibe code effectively and has a good knowledge based for optimizing Claude Code. If you enjoy real-time collaboration, clean architecture and a bit of creative “vibe coding” with AI tools, let’s get started.

I already have a hosted HTML/CSS site with several sections roughed in; now I need it taken to a polished, production-ready level. The priorities are clear: refine the visual design, tighten the navigation, and reorganize the content so everything feels purposeful and professional. Beyond aesthetics, I want real functionality. Clients must be able to register, log in, browse and purchase our services—consultations, programs, and other offerings—then complete payment in one seamless flow. After checkout they should immediately upload any required documents, so an integrated file-upload step is essential. Product/service management, a shopping-cart experience, and secure payment-gateway integration all need to sit on top of the existing codebase without starting over. Curre...

LeadExec API Integration Developer (Lead Posting, Ping/Post, Call Leads) We are looking for an experienced backend/API developer to implement a full LeadExec lead receiver integration. This is not a basic webhook job. You must have real experience with lead distribution platforms, ping/post logic, and handling async responses, offers, and delivery status. Experience needed with the following software: 1. 2. 3. You will integrate multiple LeadExec endpoints including: - Standard lead submission - Ping > Post (Inbound PING & Inbound Post) - Call leads & call transfer leads - Offer handling (1-to-1 consent) - Duplicate checks - Lead status & delivery results - Offer acceptance callbacks Scope of Work: - Implement LeadExec v2 API endpoints: /v2/insert/general, /v2/insert/...

Our production Android app is stable in the market, but I now need a rapid, one-month push to get the entire platform ready for a broader launch .The existing codebase will be shared the moment we agree on the scope, after which I need you to work end-to-end across web services and mobile. Here is what has to happen during the sprint: • Backend upgrades – Refactor database management for speed and reliability – Tighten user authentication flows and token handling – Clean up and extend API interactions so both mobile clients consume a single, consistent layer – Add real-time notifications (push and in-app), advanced analytics collection, and payment processing • Front-end polish on the current Android build – Refresh the user in...

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I need a fully-featured mobile app published on both Google Play and the App Store so my patients can reach me easily and securely. The core experience is a private messaging channel between each patient and myself, backed by phone-number authentication with a one-time password flow (no email or social log-ins). Inside the chat screen patients should be able message and also start voice with a single tap. All conversations, calls, and bot interactions must remain HIPAA-compliant and encrypted in transit and at rest. I am open to the tech stack—React Native, Flutter, or native Swift/Kotlin are all fine—as long as the final build passes App Store and Play Store review guidelines. You will also set up the lightweight backend necessary for OTP verification, real-time messaging, ...

We are looking for an experienced backend developer to help us build a WhatsApp integration system using WhatsApp Business API with webhook-based communication. Currently, the WhatsApp Business setup is not providing a QR-based authentication, so the connection will need to be handled via webhook configuration and backend session handling. The main objective is to build a scalable backend system where each user can create and manage multiple WhatsApp instances, maintain persistent connections, and handle messaging events efficiently.

I am looking for a quiz system for a website that I have that will be for people to watch a YouTube video and after the video is done running they would be presented with the first question in the quiz about the content of the video. Each subsequent question would be displayed after they answer a question until they are done and it would show them their score and send me an email that this person has submitted the quiz successfully with their score. It would have a scoring system based on the number of questions asked and there would be one single correct answer from a series of three or more possible answers. I would like a method by which I can enter an email address into a table and if the person trying to take the quiz does not have an email in that table they would not be able to take...

I’m building a social-networking experience exclusively for Android and need an end-to-end developer (or team) who can take the idea from wireframes all the way to a polished release on Google Play. Here is what I expect: • Design and implement a clean, modern UI that feels native to current Android versions (Kotlin or Java is fine, Jetpack Compose welcome). • Set up the complete back-end, authentication, real-time data exchange, push notifications and analytics using tools you are most comfortable with (Firebase, AWS Amplify, custom REST—open to recommendations). • Deliver a thoroughly tested APK / AAB plus full source code and clear build instructions so I can compile future versions myself. Acceptance criteria: 1. App installs and runs on A...

I’m building a social-networking experience exclusively for Android and need an end-to-end developer (or team) who can take the idea from wireframes all the way to a polished release on Google Play. Here is what I expect: • Design and implement a clean, modern UI that feels native to current Android versions (Kotlin or Java is fine, Jetpack Compose welcome). • Set up the complete back-end, authentication, real-time data exchange, push notifications and analytics using tools you are most comfortable with (Firebase, AWS Amplify, custom REST—open to recommendations). • Deliver a thoroughly tested APK / AAB plus full source code and clear build instructions so I can compile future versions myself. Acceptance criteria: 1. App installs and runs on A...

I need to finalize the system. It's an open-source system, so it requires a high level of expertise. Freelancers need to review the system for further discussion.

I have a series of small, rolling jobs that touch PHP, MySQL, CSS and HTML. Every few days I post a short list of 3–5 items, you look them over, place a quick bid, and—if your quote fits the lean budget I work under—I’ll hand you SSH credentials so you can jump straight into the codebase. Communication stays inside Freelancer chat; I’m online to clarify logic, database structure or front-end expectations whenever something isn’t crystal clear. Once you confirm the fixes or tweaks are finished, I’ll review on the server, release the payment for that batch, and ping you again when the next set of tasks is ready. If you’re comfortable with lightweight jobs, clear guidance and fast turnarounds, let’s start on the first task list right awa...

I’m working on a project with the AVR-IoT Cellular Mini (Sequans Monarch 2 modem), where I modified the Arduino-based firmware myself to periodically transmit GPS latitude and longitude data to my backend (BE) over HTTPS. The objective is to send GPS data (latitude, longitude, and timestamp) to a REST API endpoint at a defined interval and confirm that the data is successfully received and visible on the backend. At the moment, I’m blocked by a TLS issue while attempting to configure the CA certificate for HTTPS. When I try to add the root CA certificate (ISRG Root X1 – Let’s Encrypt) to the device/modem, I get an error that says: “CA certificate input too long” Because of this issue: • The TLS handshake fails. • The HTTPS request does no...

I am looking for a code savvy assistant to help me with my ideas. I would like to build a workflow for building tools and apps. I am interested in customizing an AI model to be a useful virtual assistant that understands my workflow and designs. I am a coder by trade, but old school, so I also want someone to teach me! I am not interested in automated bids. If you would like me to consider your bid, include human written text that is obviously written by you! Tell me something about yourself! You could really get my attention if you mention something about current events related to Magic The Gathering, The SF Giants, or DJing / Dance Music. This is the AI slop generated by my prompt I guess its ok lol: "I’m rolling up my sleeves to create “tools for building tools...

1️⃣ Project Overview We are looking for an experienced Full Stack Developer to build Loan Pay Pro, a Fintech Loan Application Platform where users can explore different loan products and apply for loans online. The platform should provide a modern, responsive, and user-friendly interface optimized for both mobile and desktop devices. Users will be able to: Explore multiple loan products Calculate loan EMI using built-in financial calculators Check their free credit score (CIBIL integration) Apply for different types of loans online Track their loan application status The system will also include an Admin Dashboard to manage users, loan applications, lending partners, and platform content. 2️⃣ Project Scope Frontend Development Pages required: Homepage Loan Products Section Lo...

Vision This is an education technology platform focused on improving MCAT CARS performance through efficient content delivery and intelligent processing. This project is the first step toward a larger system. The goal is to build a simple, clean, single‑page prototype that accepts a URL, sends it to a backend endpoint, processes the content, and displays the extracted text on the same page. This prototype will be used to validate core functionality before expanding into a full product. Project Overview Build a minimal, production‑ready single‑page web application with one input field for a URL and a content display area that updates dynamically based on backend output. The backend will fetch the URL, extract readable text, and return it as JSON. The frontend will display the returned co...

I need a app development team, who can develop the app as per the requires and give me support for 1 year , for deployment and maintains especially , this is for business so its very especial for the system to be operational and if any bugs it must be fixed asap , the app will have 16 screen and admin panel also Dev budget is 50K and support is 20K all will be paid as milestones . You can use ai to develop not an issue but import thing is maintenance

Senior Development Agency Needed — Real-Money Skill Gaming Platform Project Overview We are hiring a development agency, not individual freelancers, to build a real-money skill gaming platform based on a completed SRS, existing UI wireframes, an active GitHub repository, and existing payment/compliance providers. This platform is a full rebuild from a prior Unity implementation into a custom architecture with: • a React Native player app • web dashboards for Admin, Affiliate, and Customer Support • a server-authoritative real-time game engine • Plaid Identity / Auth / Transfer • PayPal integration • tournament systems, fraud controls, geo restrictions, and support tooling The platform is designed to support large-scale tournament play, multiple...

I need a complete website built first, followed by a lightweight Android utility app that complements the site’s core features. The site will serve as the public-facing hub, while the app will handle on-the-go tasks that users might prefer outside a browser. For the website, bring responsive front-end skills and a solid back-end framework of your choice; speed, clean code, and scalability matter most to me. Once the site’s foundation is stable, we will move on to the Android build. The mobile component is a pure utility tool—simple, fast, and focused on one primary function—so lean architecture and a minimal footprint are key. Deliverables • Fully deployed, production-ready website with tested APIs • Android APK (and Play Console assets) wired to...

I need a complete website built first, followed by a lightweight Android utility app that complements the site’s core features. The site will serve as the public-facing hub, while the app will handle on-the-go tasks that users might prefer outside a browser. For the website, bring responsive front-end skills and a solid back-end framework of your choice; speed, clean code, and scalability matter most to me. Once the site’s foundation is stable, we will move on to the Android build. The mobile component is a pure utility tool—simple, fast, and focused on one primary function—so lean architecture and a minimal footprint are key. Deliverables • Fully deployed, production-ready website with tested APIs • Android APK (and Play Console assets) wired to...

I NEED A COPY WEBSITE JUST LIKE ITALKI AND ITS ALL FEATUREES

I need a slim, login-based multi-tenant portal that lets phone repair shops handle the full life-cycle of a ticket while keeping every record synced to JetForm through its API. Core workflow A Shop Owner (with Sales and Admin roles also available) logs in with Email and Password, creates or selects a Customer, registers the Device with its IMEI, adds the replaced screen or other part, and submits a Ticket. The portal must automatically attach the “Coverage” coverage using a per-tenant setting that toggles the deductible between 0 lek and 3 000 lek. Search & claim Staff later search Tickets by IMEI or customer name, open the record, shoot a short 5–9 second verification video (≤ 31 MB), and file a Claim that is auto-approved for this MVP. All Customers, Device...

I'm seeking an experienced software engineer to create a web-based interactive sales platform. The primary function of this platform will be to allow users to browse an extensive product catalog and conduct detailed searches. Essential Features: - Comprehensive product catalog and efficient search functionality. - Recommendation engine to suggest products based on user behavior and preferences. - Live chat support for real-time customer assistance. Ideal Skills and Experience: - Proficiency in web development technologies (HTML, CSS, JavaScript, etc.). - Experience in building recommendation engines. - Strong background in integrating live chat support systems. - Previous experience in developing sales or e-commerce platforms would be advantageous. Please provide examples of simil...

I run a fully custom PHP billing platform and I’m ready to connect it to the GST Pro REST service. The goal is to make every GST touchpoint—GSTIN checks, invoice synchronisation, e-way-bill creation and other automation—happen seamlessly inside the application. You’ll receive the official GST Pro documentation, access to a staging clone of the site, and a test API key. Your job is to wire the endpoints into our existing codebase, return clean JSON responses, and make sure data flows reliably to and from GST Pro without slowing the UI. Key deliverables • Complete REST setup: authentication, environment switching (sandbox / live) and robust error handling • Real-time GSTIN validation hooked into our customer-onboarding form • Automatic push/pull...

Backend Engineer Needed for RAG Architecture (LLM + Vector Database) --- Project Description I am looking for an experienced developer to design and implement a production-grade RAG (Retrieval-Augmented Generation) backend for a controlled knowledge system. This is not a generic chatbot project. The goal is to build a system where a language model can query a structured knowledge base while enforcing strict safety and retrieval rules. The system will be used in a clinical / healthcare-related context, so accuracy, traceability and rule enforcement are critical. --- Current Infrastructure The current setup includes: WordPress website hosted on Hostinger (content origin / source of truth) Cloud environment on Hetzner available for backend deployment Initial automation infrastruc...

Project: Armbrella – Fitness & Wellness Social Platform Armbrella is a mobile platform focused on fitness and wellness that combines health tracking tools, social media features, free wellness video content, and a professional search engine for users to connect with trainers and wellness professionals. The mobile application is built using React Native, while the backend services are developed using NestJS and AWS cloud infrastructure. The platform was originally built using AWS Lambda (serverless architecture), but due to performance limitations, cold start latency, and stability issues, the application experienced delays in launch readiness. We are now migrating the backend architecture from AWS Lambda to AWS EC2-based services to ensure better performance, reliability, and sca...

I have a steady stream of micro-tasks that revolve around building custom sliders and carousels for WordPress sites. For each request I will supply JPEG or PNG references plus basic instructions on what I need. Sometimes a phone call is needed. Your job is to translate that into a lean shortcode or widget written in PHP, HTML, CSS and vanilla JS (or a lightweight library we mutually agree on), enqueue it properly, and hand back a drop-in file that’s ready for production. Because these jobs are small I expect a 48-hour turnaround from the moment I deliver specs. zip with clear install notes or to make amendments to a cloned page in Live is all I need; if anything breaks in the first round of testing, I’ll ping you for an immediate patch. Knowing your way around WordPress h...

I’m working with an existing FlutterFlow template and need it fully connected to Firebase. This includes configuring Firebase Authentication, a Firestore (or Realtime) database, and Cloud Messaging so I can log users in, store data, and push notifications without errors. Once the back-end connection is solid, I’d like a few light front-end touches: update the primary colour palette to match my branding and swap specific wording in the UI—think changing every instance of “event” to “activity” and similar quick text edits. Deliverables • Firebase project configured and linked to the FlutterFlow app (Auth, Database, Cloud Messaging) • Updated colour scheme applied across all relevant screens • Text replacements completed and ver...

I have an MVP running on Java 17, Spring Boot, REST, and MySQL, and now I need it turned into a production-grade multi-vendor marketplace. The platform must expose dedicated Admin, Seller, and User dashboards, scale confidently on AWS, and remain clean and testable. Scope • Upgrade the existing product, cart, order, and payment modules so multiple sellers can manage their own catalogues independently. • Add advanced search functionality—keywords, categories, price ranges, and vendor filters—backed by Elasticsearch (or a comparable search engine) and integrated with Spring Data. • Introduce user reviews and ratings with a moderation workflow surfaced in the Admin panel. • Deliver real-time notifications for order status updates, stock alerts, and sel...

I have a single MySQL database sitting on my Hostinger account and three separate custom-built PHP sites that need to talk to it. At the moment the connection fails whenever the login page tries to authenticate a user, so I suspect the issue is buried somewhere in the backend configuration—possibly wrong credentials, hostnames, or overlooked privileges inside phpMyAdmin. Here’s what I need from you: • Inspect the current hPanel and phpMyAdmin settings, make sure the database user has the right privileges, and confirm the host names for all three sites. • Review each site’s PHP connection file, tidy up the mysqli / PDO code as required, and verify that user-authentication queries run without errors. • Test end-to-end on all three domains so logging i...

I need a professional mobile app developer who can deliver a working app. Please share your previous app work, estimated timeline, and cost.

I’m searching for someone who can comfortably switch between front-end and back-end work while also handling day-to-day bidding on freelance marketplaces for me. The development stack is flexible at this stage, so if you are equally happy working in React, Angular, Vue, Node.js, Django, Rails—or any comparable frameworks—feel free to bring your strengths to the table. Here’s what the role looks like: • Code what’s needed on both the client and server sides, from fixing small UI bugs to adding new database-driven features. • Draft, refine, and submit compelling proposals on freelance platforms, keeping an eye on suitable projects and tailoring each bid to maximise our win rate. • Provide quick progress updates so we can keep momentum and ad...