You will get Modern Full-Stack Web Apps with React, Node.js & MongoDB
Project details
Hello startups and digital product builders!
I contributed as a Senior Backend Engineer to Custodiy, a modular MERN stack platform designed to support businesses, entrepreneurs, and organizations. I developed scalable backend services using Node.js, Express.js, and MongoDB, enabling features such as marketplace creation, secure OTC transactions, fundraising tools, and encrypted document management. The frontend was built with React, while blockchain functionality was integrated using Web3.js and Solidity on Binance Smart Chain. The result: a secure, flexible platform for powering modern digital ventures.
Key Responsibilities & Contributions:
• Full backend development using Node.js, Express.js, and MongoDB
• Smart contract and blockchain integration (Web3.js & Solidity)
• React-based frontend support for dynamic user experiences
• REST API architecture for modular business functions
• Secure systems for document handling and transactions
Why choose me?
• Deep experience with the MERN stack and blockchain technologies
• Proven ability to build secure, scalable business platforms
• Clean code practices and strong architectural planning
• Reliable communication
I contributed as a Senior Backend Engineer to Custodiy, a modular MERN stack platform designed to support businesses, entrepreneurs, and organizations. I developed scalable backend services using Node.js, Express.js, and MongoDB, enabling features such as marketplace creation, secure OTC transactions, fundraising tools, and encrypted document management. The frontend was built with React, while blockchain functionality was integrated using Web3.js and Solidity on Binance Smart Chain. The result: a secure, flexible platform for powering modern digital ventures.
Key Responsibilities & Contributions:
• Full backend development using Node.js, Express.js, and MongoDB
• Smart contract and blockchain integration (Web3.js & Solidity)
• React-based frontend support for dynamic user experiences
• REST API architecture for modular business functions
• Secure systems for document handling and transactions
Why choose me?
• Deep experience with the MERN stack and blockchain technologies
• Proven ability to build secure, scalable business platforms
• Clean code practices and strong architectural planning
• Reliable communication
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$600
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 2 | 2 | 2 |
Number of Pages | 3 | 6 | 10 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
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AH
Alex H.
Jun 2, 2025
Developer Wanted To Join Our Back-End Team
AL
Austin L.
May 8, 2025
Need Senior Full-Stack Developer to Fix a Feature and Optimize Backend (Next.js + PostgreSQL)
Azeem did an exceptional job — he not only fixed the unreliable save/load functionality in my app, but also quickly identified and resolved performance issues I didn’t even know existed. His debugging skills are top-tier, he worked fast, communicated clearly throughout, and delivered clean, well-documented code. Highly recommended if you need a full-stack expert who genuinely cares about quality, speed, and performance.
About Azeem
Full-Stack AI Engineer | LangChain | RAG | Elixir | Node.js | PenTest
100%
Job Success
Lahore, Pakistan - 3:36 pm local time
With 5+ years of professional experience and 30+ successfully delivered projects, I specialize in building production-grade SaaS backends, real-time systems, and AI-powered functionality that continues to perform as products grow. I work closely with founders and product teams to turn ideas into reliable, maintainable systems that support real business goals.
I work best with teams that care about architecture, performance, and long-term product health. If you are looking for quick hacks or fragile implementations, I may not be the right fit. If you want a system built to scale, evolve safely, and survive real-world usage, we will work very well together.
AI is not an add-on in my work. When it makes sense, I integrate AI as real product functionality that drives automation, insight, and operational efficiency inside SaaS products. I also use modern AI-assisted development tools such as lovable.dev and Cursor Antigravity to speed up complex development tasks while maintaining clean, production-quality code.
What I typically help with:
SaaS backend and system architecture
API-first backend design using REST and GraphQL
Scalable systems using Node.js and Elixir with Phoenix and LiveView
Multi-tenant SaaS foundations and modular services
Role-based access control, authentication, and secure authorization
Background jobs, queues, schedulers, and asynchronous workflows
Database design, migrations, and performance optimization
Payment systems and billing workflows including Stripe and Stripe Connect
AI integration for real use cases:
ChatGPT-powered assistants, chatbots, and internal tools
AI automation and intelligent workflows
Content generation, summarization, and decision-support features
Secure prompt handling, token usage control, and cost management
AI features embedded directly into real SaaS products
Real-time and event-driven systems:
Live notifications, dashboards, and messaging systems
WebSockets, Phoenix Channels, and LiveView
Event-driven architectures built for scalability
Frontend for SaaS products:
React and Next.js dashboards and admin panels
Clean UX for data-heavy and operational interfaces
Performance-focused, component-driven UI development
Cloud, DevOps, and production readiness:
Dockerized applications and CI/CD pipelines
Cloud deployments on AWS and Google Cloud Platform
AWS services including EC2, S3, RDS, Lambda, and EKS
Kubernetes-based container orchestration and scaling
Monitoring, logging, and production hardening
Databases and data systems:
PostgreSQL, MongoDB for SaaS workloads
Supabase (PostgreSQL, Auth, Storage) for rapid SaaS backends
Vector search and embeddings for AI and RAG workflows (pgvector-style)
Oracle Database
Security and reliability:
Secure API design and access control
Authentication, authorization, and tenant isolation
Stability-focused design for long-running systems
How I work:
I do not just ask what feature you want.
I ask how the system will scale, evolve, or break in six to twelve months.
This mindset helps reduce technical debt, avoid costly rewrites, and keep systems maintainable as teams and usage grow. I communicate clearly, take ownership of the systems I build, and flag risks and improvements early.
Core tech stack:
Node.js, Elixir, Phoenix, LiveView, React, Next.js, AWS, GCP, Kubernetes, Docker, PostgreSQL, MongoDB, Oracle, Stripe, WebSockets, REST, GraphQL.
Typical projects I handle:
SaaS platforms and admin dashboards
AI-powered tools and automation systems
Payment-enabled SaaS applications
Real-time systems and scalable APIs
If you are looking for a developer who understands systems, scalability, and business impact, not just code, we will work well together.
Message me and tell me what you are building.
Additional skills and keywords for search visibility:
AI SaaS development, AI integration, conversational AI, NLP, intelligent systems, AI automation, AI workflows, Node.js backend engineer, TypeScript, Elixir developer, Phoenix framework, Phoenix LiveView, GenServer, Oban, event-driven architecture, distributed systems, microservices, multi-tenant SaaS, scalable architecture, SaaS MVP development, subscription-based platforms, product-led SaaS, React.js, Next.js, admin dashboards, internal tools, data-heavy interfaces, performance optimization, REST APIs, GraphQL, third-party integrations, Stripe payments, Stripe Connect, subscriptions, invoicing, webhooks, JWT, RBAC, secure authentication, real-time systems, WebSockets, Phoenix Channels, push notifications, background processing, job queues, AWS, GCP, AWS EKS, Kubernetes, Docker, CI/CD pipelines, GitHub Actions, cloud deployments, infrastructure scaling, observability, monitoring, logging, Prometheus, Grafana, Loki, ELK stack, workflow automation, n8n, lovable.dev, Cursor, Antigravity.
Steps for completing your project
After purchasing the project, send requirements so Azeem can start the project.
Delivery time starts when Azeem receives requirements from you.
Azeem works on your project following the steps below.
Revisions may occur after the delivery date.
Project Development
I start working on the project, keeping you updated on the progress. I ensure all your requirements are being met as we move forward.
Client Reviews & Provides Feedback
Once the initial work is complete, you review the progress and provide any feedback or changes.