✅ Full-Stack Software Engineer with 5+ Years of Experience
I am an experienced full-stack developer and competitive programmer with expertise in building scalable, high-performance systems and applications.
With a strong foundation in programming and problem-solving, I have successfully developed production-level applications that support high-volume transactions.
Frontend Expertise
✅ React, Vue, Nuxt.js, Next.js, TypeScript, JavaScript
✅ Tailwind CSS, Material UI, CSS
Backend Expertise
✅ Node.js, FastAPI, Django, NestJS, Gin, Fiber
✅ PostgreSQL, MongoDB, MySQL
✅ BaaS platforms such as Supabase, Appwrite
✅ Event streaming and queues like RabbitMQ and Kafka
Competitive Programming
✅ Strong foundation in algorithms and data structures
✅ Proficient in Python, JavaScript, and Golang
DevOps & Cloud
✅ Docker, Kubernetes, AWS, GCP
✅ gRPC, REST, GraphQL
Why Choose Me?
⭐ Clean, structured, and maintainable code
⭐ Excellent communication and fast response times
⭐ Proven ability to deliver on time, with room for iterations
⭐ Strong analytical skills and problem-solving experience
⭐ Passion for exploring new technologies and delivering impactful solutions
Python
Golang
FastAPI
Docker
Vue.js
React
REST API
GraphQL
MongoDB
Supabase
TypeScript
JavaScript
NestJS
Django
Next.js
Rafique Adam C.
Accra, Ghana
$15/hr
5.0
21 jobs
Backend Developer helping SaaS startups, agencies, and growing businesses build fast, secure, and scalable backend systems, secure APIs, fix performance issues, integrate third-party services, or turn your MVP into a scalable product.
Whether you need a new API, a complete backend from scratch, bug fixes, database optimization, AI integration, or ongoing development support, I focus on delivering software that's built to perform today and scale with your business tomorrow.
I look at the bigger picture - performance, maintainability, security, scalability, and the user experience behind every technical decision.
MY CORE SERVICES:
Backend Development:
• Build scalable Node.js backends from scratch
• Develop secure Express.js and NestJS applications
• Design backend architecture for SaaS products
• Build server-side logic for custom web applications
• Develop microservices and modular backend systems
• Optimize backend performance and reduce server response times
REST API & GraphQL Development:
• Build custom REST APIs for web and mobile applications
• Design scalable API architecture
• Connect React, Next.js, Flutter, or mobile apps to backend APIs
• Develop GraphQL APIs for modern applications
• Document APIs with Swagger/OpenAPI
• Fix broken APIs, authentication errors, and integration issues
API Integration:
• Integrate Stripe, PayPal, Twilio, SendGrid, Google Maps, Firebase, and other third-party APIs
• Connect OpenAI and ChatGPT APIs to existing applications
• Build webhook integrations and automation workflows
• Resolve API authentication and data synchronization issues
Performance Optimization & Bug Fixing:
• Fix Node.js, Express.js, React, and Next.js bugs
• Optimize PostgreSQL and MongoDB queries
• Improve API response times
• Reduce application load times
• Refactor legacy codebases
• Troubleshoot production issues and deployment errors
Full Stack Development:
• Build full-stack web applications using React and Next.js
• Convert Figma designs into responsive web applications
• Build dashboards, admin panels, and customer portals
• Add new features to existing products
• Maintain and improve legacy applications
AI Integration:
• Integrate OpenAI APIs into web applications
• Build AI-powered chatbots and assistants
• Add AI automation to existing products
• Develop intelligent workflow automation features
TOOLS & TECHNOLOGIES:
Backend: Node.js • Express.js • NestJS • JavaScript • TypeScript • Python • FastAPI
Frontend: React.js • Next.js • HTML • CSS • Tailwind CSS • Bootstrap
Databases: PostgreSQL • MongoDB • MySQL • Redis • Firebase
Cloud & DevOps: AWS • Docker • Vercel • Railway • Render • GitHub Actions • CI/CD
Tools: Git • GitHub • Prisma • Sequelize • TypeORM • Postman • VS Code • Jira • ClickUp • Slack • Notion
WHAT YOU GET:
✔ Clean, scalable, and maintainable code
✔ Clear and proactive communication
✔ Reliable delivery and realistic timelines
✔ Well-documented solutions
✔ Security-first development
✔ Long-term support after launch
✔ Strong problem-solving mindset
If you're looking for Backend Developer who can build a scalable Node.js backend, develop secure REST APIs, fix performance bottlenecks, integrate third-party APIs, optimize PostgreSQL or MongoDB databases, build or improve your SaaS application or maintain and scale your existing application, I'd love to help.
Click the "Invite to Job" button or send me a quick message. I'll review your requirements, suggest the best technical approach, and help you build a reliable, scalable solution that supports your business goals.
Back-End Development
Node.js
API
REST API
ExpressJS
TypeScript
JavaScript
PostgreSQL
NestJS
Database
API Integration
MongoDB
Full-Stack Development
GraphQL
React
Next.js
Amazon Web Services
SaaS
SaaS Development
Web Application
Omar H.
Algiers, Algeria
$16/hr
5.0
11 jobs
Im Currently Upwork's top 10% in web/mobile and Healthcare Systems development.(Via UpworkMrr Rankings).
Give me something to build and i'll build it so it works for you 24/7. Thats my promise.
If you shoot me a invitation or message ill send you a personalised loom video back on how i may be able to help you!
A little more about me:
I help growth-focused businesses save time and scale fast by offering both systems and automations as full stack developer, so you have clean stored data, and the benefits of automations
If your team is stuck in spreadsheets or bogged down by manual work, I’ll build reliable software systems and AI agents to turn your chaos into streamlined, data-driven processes.
• last +2y building sensitive healthcare softwares HIPAA with react, react native, next, fastapi, and azure for infra.
• 3+ years taking products from idea to production—owning architecture, development, deployment, and real-world adoption.
• Experienced onboarding clients and working directly with stakeholders.
• 100% Job Success Score | 5.0★
• HIPAA certified.
• Real, measurable ROI my systems pay for themselves.
• Clear communication and tailored solutions, every time.
If you’re looking for someone who can own the entire technical side of your product from planning and architecture to deployment and long-term support while delivering quickly and maintaining high quality, those are exactly the kinds of projects I look for also.
🔧 EXPERTISE:
FastAPI | React | React Native | Next.js | next | Back-End Development | Front-End Development | Full-Stack Development | Mobile App | Web Application | Supabase | PostgreSQL | Healthcare Software | HIPAA | LangChain | Node.js | js | API Integration | Azure DevOps | User Authentication | Electronic Health Record (EHR) | Electronic Medical Record (EMR)
React
Next.js
React Native
FastAPI
Back-End Development
Front-End Development
Full-Stack Development
Web Application
Mobile App
Supabase
PostgreSQL
Azure DevOps
LangChain
Node.js
API Integration
User Authentication
Healthcare Software
HIPAA
Electronic Health Record
Electronic Medical Record
Muhammad N.
Lahore, Pakistan
$20/hr
5.0
8 jobs
Software Engineer with expertise in building scalable enterprise systems, fintech integrations, and AI-driven applications. I specialize in modern backend architectures and cross-platform mobile development, delivering secure, production-ready code for high-stakes environments.
Core Strengths:
• Enterprise Engineering: Architecting backends that handle financial transactions with 100% auditability and data integrity.
• AI Integration: Building intelligent agents and RAG pipelines using LLMs (Gemini, OpenAI) for personalized user experiences.
• Full-Cycle Development: Leading projects from system design and database modeling to deployment and CI/CD automation.
Technical Expertise:
• Backend: Node.js, NestJS (TypeScript), Python (Django, FastAPI), SOAP-to-REST migration.
• Mobile: Flutter (GetX, Clean Architecture) for iOS & Android.
• Database: PostgreSQL, OracleDB, MySQL, Firestore, Prisma ORM.
• Infrastructure: Docker, AWS, Firebase, Serverless.
Featured Projects:
• Makro Self-Checkout Integration: Engineered a secure middleware adapter for legacy payment terminals, ensuring zero data loss.
• GymBite: Built an AI-powered nutrition platform with a hybrid Node.js/Firebase backend and ML-driven personalization.
• CalmSpace: Developed a real-time mental health platform featuring secure video/audio streaming via WebSockets.
Education:
• Bachelor of Science in Software Engineering, COMSATS University Islamabad.
Node.js
Flutter
Firebase
NestJS
React
AI Implementation
Software Architecture & Design
Full-Stack Development
Software Development
Back-End Development Framework
JavaScript
Python
TypeScript
Brijesh P.
Lucknow, India
$20/hr
4.4
130 jobs
With 15+ years of experience in full-stack web and mobile application development, I help startups and enterprises build scalable, secure, and AI-powered applications from idea to production.
I work closely with clients throughout the entire product lifecycle — from requirement analysis and architecture design to UI/UX, development, deployment, and scaling.
My experience spans modern JavaScript frameworks, Python-based backends, cloud infrastructure, and AI-driven development workflows, enabling me to deliver solutions that are both technically robust and business-focused.
I have successfully built simple MVPs to complex enterprise platforms across industries such as Healthcare, FinTech, Logistics, Marketplaces, and Social Platforms.
---
Core Expertise :
Full Stack Development
* AI First approach
* Frontend: React.js, Angular, React Native, JavaScript, jQuery
* Backend: Python, Node.js, PHP (Laravel, CakePHP)
* Databases: MySQL, PostgreSQL, MongoDB, InfluxDB
* API Development: REST APIs, Web Services, Microservices
AI-Assisted Engineering
* Cursor AI development workflows
* GitHub Copilot and AI coding agents
* AI-powered application features
* Integration with AI APIs and models
* AI-assisted development pipelines
Cloud & Infrastructure
* AWS architecture and deployment
* AWS Lambda
* Amazon S3
* CloudFront
* Serverless architecture
* DevOps deployment pipelines
Data & Visualization
* Highcharts data visualization
* Real-time dashboards
* Time-series data using InfluxDB
* Grafana monitoring
* Kafka streaming pipelines
---
Domain Experience :
Healthcare Technology
* HIPAA-compliant systems
* Telemedicine platforms
* Clinical workflow systems
* HL7 & FHIR integrations
* EMR / EHR integrations
* Cerner APIs (System, Provider & Patient APIs)
FinTech
* Payment integrations using Plaid & Dwolla
* Secure financial APIs
* Compliance-driven architecture
Industrial IoT / Automation
* SCADA System
* PLC integration
* OPCUA protocol
* Ethernet/IP
* Modbus TCP
* Real-time machine data collection and control
---
Additional Technical Expertise
* Custom Slack Apps & Bots
* Bubble no-code / low-code platform
* Secure API architecture
* Web application security
* Real-time data systems
* Marketplace & SaaS platforms
---
Development Approach
* Quick understanding of business requirements
* Clean, maintainable, and scalable code
* Strong communication with clients
* Secure and reliable architecture
* Leveraging AI tools to accelerate development
---
Industries Served
* Healthcare & Telemedicine
* FinTech
* Logistics & Supply Chain
* E-commerce
* SaaS Platforms
* Marketplaces
* Social Platforms
---
If you are looking for an experienced developer who can transform complex ideas into reliable and scalable applications, I would be happy to collaborate.
Thanks!
Node.js
.NET Core
Electronic Health Record
Angular
ChatGPT
HIPAA
FHIR
Health Level 7
React
Telemedicine
Flutter
React Native
Java
Microsoft Azure
AWS Lambda
Alex T.
Constanta, Romania
$25/hr
5.0
11 jobs
⏳ Saved founders and users 1000+ hours through fast-loading apps and reliable AI integrations across 7+ SaaSes & Marketplaces
🎖️Top-rated Senior Backend Developer with 7 years of experience. Focused on Multi-Tenant/Marketplace projects and AI Agents(or both)
🔧 I am best at making complex DB queries fast and AI integrations and agents that strike the balance between speed and reliability.
🫡 WHY ME: I like to help you solve your technical challenges by marrying them to business outcomes. Where most developers exist in a bubble of just writing code, I'd also like to implement solutions that would help you succeed.
What you'll get:
✅ Jargon-free, NO BS, no-nonsense communication style. Talking the technical to the non-technical.
✅ Zero micro-management: I can think, plan, and propose solutions on my own, yet your input is much welcomed. Your time is better spent marketing or managing the business.
✅ Fluent English Freelancer who communicates ideas in a way that makes business sense
🙌 Industries worked with: Marketplace Style Apps(Jobs, Real Estate, etc), EdTech, FinTech, Integrations
📚 STACK: As a backend developer, I specialize in Node.js, TypeScript, MongoDB, a bit of SQL too, where needed, Trpc, and a bit of Express when needed, Zod, a bit of Next.js and React where needed, Nginx, and Digital Ocean, and a bit of AWS/GCP when needed 💯.
💪🏼 EXTRA EXTRA :) Here are more specific things I'm good at:
📌 Complex MongoDB aggregations designed for querying large amounts of data in a fast way
📌 Making MongoDB typesafe and integrating it with TypeScript and Zod
📌 Experience with nginx, DNS servers & Virtualmin
📌 Web sockets, monorepos - integrated one DB with 2 backends: the main app and our internal dashboard
📌 AI Backend integrations - utilized AI in the backend for data generation & transformation
📌 Experienced with web scraping and external rest api’s
📌 Familiarity with security vulnerabilities such as CSRF, brute force, SQL injections, etc.
📌 Experience with stronger than JWT encryption systems, such as Passetto
📌 Database Migrations: SQL to SQL or SQL to MongoDB
🏁PPS: For examples of my work, make sure to see my portfolio or my intro video, which go into much more detail
📥 JUST MESSAGE ME: Now that you're convinced I'm good at this backend thingy, shoot me a message to start working together 🤝
Next.js
React
Node.js
MongoDB
ExpressJS
TypeScript
SQL
Back-End Development
AWS Development
API
AI Development
AI App Development
Supabase
API Integration
Claude
AI Model Integration
Chatbot Integration
ChatGPT API Integration
NestJS
NestJS Development
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