Backend Development projects — HireLancer archive

ID / Date Listing

Cross-Platform Music Streaming App

I’m launching a full-scale music streaming service and need a complete application suite that runs smoothly on iOS, Android, and the web. The experience should...

HL-40469530

Direct Corporate Hire: 78 Full-Stack Cloud Engineers (10k Sprint)

ANTI-BOT CODE REQUIRED FOR CONSIDERATION: To prove you are a human engineer and not an automated AI bidding script, your bid proposal on Freelancer.com MUST beg...

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Hiring: Senior AI Engineering Team / Company for AI-Native Travel Platform (Phase 2)

We are building an advanced AI-powered travel intelligence platform called Book With AI focused on transforming flight search and travel planning through conver...

HL-40469336

AI-Powered Business Automation Ecosystem Development

Need a highly experienced team to build an AI-powered business automation ecosystem from scratch. This is a large-scale, enterprise-level platform — not a basic...

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Part-Time Software Engineering Roles – Full Stack & AI (Remote)

I collaborate with several US-based web companies and am currently looking for an experienced engineer to support ongoing, project-driven development work. We a...

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Title: Senior Laravel + Vue.js + Flutter Developers Needed for 3 Existing Platforms (Major UI/UX Revamp + Ongoing Improvements)

This platform does not allow formatting. So, the text is below, and the same text, but formatted, is here: https://docs.google.com/document/d/1GBW-jEcpXTiIH4uCM...

HL-40469216

Scalable Classified Website

Project Title Build a Scalable Classified Ads Platform with Auctions, Digital Downloads, and PayPal Payments Project Summary I am building a general classified...

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Développement Web Sur Mesure

Je souhaite lancer un projet de développement web et recherche un(e) spécialiste capable de gérer l’ensemble du processus, de l’architecture technique au déploi...

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Senior PHP Laravel Developer Needed – Fishing Operations Management & Accounting System (ERP/SaaS)

I’m kicking off the first phase of a web-based Fishing Operations Management and Accounting platform and need a seasoned Laravel specialist (or a tightly knit t...

HL-40468846

Revisão de App e Ativação de API

Preciso de um desenvolvedor experiente para revisar meu aplicativo de serviços. O foco principal é melhorar as funcionalidades e ativar chaves de API necessária...

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Backend Developer for Marketing Agency Platform

We are building Garon Digital, a white label digital marketing agency platform. The entire frontend is already built in React. We need a backend developer to co...

HL-40468673

Basic Android Task Manager

Need an Android developer to create a simple task manager app. Users should be able to add, edit, delete, and mark tasks as completed. The UI should be clean an...

HL-40468513

Digital Products E-commerce Website

I’m launching an online store focused exclusively on digital products and I need a developer who can take the project from setup to secure checkout. The core re...

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LLM Strategy Simulation MVP

I’m building a semi-automated strategic simulation and decision stress-testing platform. The system is designed to help businesses identify: messaging friction...

HL-40468238

Distributed API Gateway Development

I have three microservices—User, Order, and Payment—that need to sit behind a single Spring Boot-based API Gateway capable of handling well over 1000 concurrent...

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棋牌服务端数据错乱修复｜核心精简需求文档 -- 2

1. 问题概述（核心根因）项目当前实时牌局数据双存：服务端内存（实时对局）+ Redis缓存（兜底同步）。服务器部署商用安全防护服务，会拦截系统底层内存读取与导出行为。...

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Développement Plateforme Web Sur Mesure

Je souhaite transformer une idée d’affaires en une plateforme web sur mesure. L’objectif est d’obtenir un produit fiable, rapide et évolutif qui offre une expér...

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KajNow Booking System Integration

My KajNow mobile app is already live on iOS and Android; its screens and user flows are in place but the actual booking engine is still missing. Your task is to...

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WhatsApp Event Ticketing Flow

I need a complete WhatsApp-based ticketing experience—think of the Delhi Metro flow, but for events. A guest should be able to message a WhatsApp number, create...

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Java Spring Boot Web Development

Project: JSP + Spring Boot Backend Project * Developed a full-stack web application using Java, Spring Boot, and JSP to handle dynamic user interactions and bac...

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GHRU Voice Assistant – AI Powered College Inquiry System

Developed an AI-powered bilingual college inquiry assistant using Python Flask. Features: • Voice and text interaction • English & Hindi support • Smart course...

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AI Fishing Identification Mobile App

We need a developer to build a lightweight Fishing Achievement Mobile App MVP. The app is for recreational fishing users. Users should be able to take or upload...

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Fix SMS OTP Authentication - 25/05/2026 04:29 EDT

I already receive the OTP successfully through MSG91 and can confirm that the code entered is correct, yet the login flow halts right after verification—no sess...

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Small SaaS for simple support

I'm looking for a full-stack developer in order to develope with AI builders, fix and put online this kind of small SaaS. It is all about a small, agile, white-...

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Bilingual Real Estate Platform Development - 25/05/2026 04:42 EDT

Project Description: We are looking for an experienced web developer or team to build a bilingual (Arabic & English) real estate platform. The platform will all...

HL-40467611

Themed Online Slot Game Build

I need an end-to-end production of an online slot game created purely for entertainment. The project calls for one capable partner who can handle every layer—vi...

HL-40467411

CodeIgniter Backend Development Support

I need a seasoned PHP developer who works comfortably in CodeIgniter to take ownership of the server-side logic for an existing web application. Your main goal...

HL-40466927

3CX Integrations with CRM / Job management softwre

Multi‑Tenant Middleware Between 3CX Phone System → AWS → Third‑Party Apps I need a backend developer to build a multi‑tenant middleware service hosted in AWS Sy...

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Bangun Sistem Manajemen Tugas - 24/05/2026 23:05 EDT

Saya ingin meningkatkan efisiensi bisnis kami dengan sebuah sistem manajemen tugas yang sederhana namun efektif. Fokus utama saya adalah: • Otomatis mengelola p...

HL-40466668

Website Edu SMP-Kuliah

Saya ingin membangun sebuah situs web edukasi berbahasa Indonesia yang dapat menghasilkan pendapatan. Fokus monetisasinya akan sepenuhnya melalui website itu se...

HL-40466709

OpenAI API Expert – Production Error Handling & Rate Limit Optimization

I have an existing OpenAI integration (GPT-4) in my Node.js/Express backend. The API calls work about 80% of the time, but I need an OpenAI expert to make it pr...

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Desarrollo CRM Comercial - Python/React (Ideal que el programador se comunique Verbalmente en Español)

Tecnologías objetivo: Backend Python + Frontend React 1. Objetivo General del CRM Desarrollar un CRM comercial integrado con Mediante API que permita gestionar...

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AzuraCast Stream URL change

I need the MP3 stream address for one of my AzuraCast stations switched to mp3.eternityready.com/stream. The fallback stream is already in place, so it’s a stra...

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Full-Stack EdTech Developer for Finnish Paradigm -- 2

We are seeking an experienced full-stack EdTech developer / technician to complete and deploy a commercial teacher-training platform based on The Finnish Paradi...

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Rapid App Development with Lovable, Supabase & APIs

App Developer Needed (Lovable + Supabase + API Integrations) We are building an app and are looking for an experienced developer or small team to help build and...

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Senior Software Engineer — AI Evaluation & Benchmarks | Remote Contract | $80–$100/hr

Project Overview We are seeking highly experienced Senior Software Engineers to contribute to cutting-edge AI evaluation and benchmarking initiatives that help...

HL-40465537

Website E-commerce Dengan Formulir Pesanan -- 2

Saya ingin membangun sebuah website e-commerce yang bersih, cepat, dan mudah dipelihara. Fokus utamanya adalah formulir pemesanan terintegrasi yang memungkinkan...

HL-40465417

Scrollable Web Productivity Canvas

I’m looking to turn my idea of a “digital diary meets planning board” into a working web app. Picture a 360-degree scrollable canvas laid out in vertical day co...

HL-40465488

Senior Next.js + Laravel Performance Optimization Expert Needed (Frontend + Backend)

We are looking for a highly experienced full-stack developer who specializes in performance optimization for large-scale e-commerce platforms built with Next.js...

HL-40465228

Laravel 5 Upgrade And Enhancements

I bought a Laravel 5 PHP 7.2 script on CodeCanyon a while ago and now I need it running on the latest stable Laravel release. The goal is a complete, clean upgr...