Hi, I'm
Hassaan Siraj
Full Stack Developer
Building fast, reliable, and scalable digital experiences
// Technologies I work with
About Me
Crafting Digital Excellence
I'm a Full Stack Developer and Software Engineer with around 3 years of professional experience building scalable, production-grade web applications. Grounded in computer science fundamentals with proven expertise in Python, FastAPI, Ruby on Rails, React, and Node.js.
I've shipped real-world solutions across healthcare technology, Web3 platforms, and AI-driven automation — including EHR data ingestion pipelines for wearable devices, LLM-powered workflow systems, and multi-wallet blockchain integrations serving clinical and insurance systems.
Strong track record in designing RESTful APIs, integrating third-party services, and owning features end-to-end in agile environments. My approach combines technical rigor with a deep understanding of business needs.
Full Stack Expertise
End-to-end feature ownership across React frontends and Python/Rails backends — from scoping to production deployment.
Backend & API Design
Strong foundation in Python/FastAPI and Ruby on Rails for building production-grade REST APIs, webhook systems, and microservices.
AI & Web3 Integration
Experienced integrating LLM APIs into automation workflows and building Web3 wallet connectivity with Reown WebKit.
Healthcare & Fintech
Deep domain experience in HIPAA-compliant EHR systems, health device integrations, and Stripe Connect payment platforms.
Primary Tech Stack
Results
Measurable impact across every project
Years of Experience
Users Impacted
Projects Delivered
Technologies Mastered
Professional Experience
Devsinc
Software Engineer • Lahore, Pakistan
Building production-grade integrations across healthcare EHR platforms, Web3 digital asset platforms, and AI-driven automation systems. Owning full-stack feature development from technical scoping through deployment.
Integrated health device APIs (Fitbit, Omron, Garmin, Oura, Dexcom) into a US-based EHR platform, engineering data ingestion pipelines with Python/FastAPI including idempotent webhook endpoints, OAuth 2.0 flows, and HMAC validation.
Built end-to-end Web3 wallet integration using Reown WebKit on a digital asset platform — multi-wallet auth, EIP-712 transaction signing, and real-time on-chain status tracking across a React/Python stack.
Designed Python/FastAPI backend services and async task pipelines for an AI automation platform, integrating LLM APIs to power automated content processing and intelligent workflow execution.
Extended a Node.js/AngularJS healthcare platform with Calendly scheduling, Stripe Connect payment onboarding, and OAuth-based Google/LinkedIn SSO.
Devsinc
Associate Software Engineer • Lahore, Pakistan
Contributed to a US-based healthcare microservices platform ingesting and standardizing EHR data from wearable devices, serving insurance providers, hospitals, and clinical staff.
Maintained and upgraded Ruby on Rails and Sinatra microservices, resolving dependency conflicts and coordinating zero-downtime deployments across service boundaries.
Refactored legacy service interfaces to restore backward compatibility and reduce technical debt, unblocking feature development across the HIPAA-compliant microservices architecture.
The Journey
From curious beginner to full-stack developer — a story of continuous growth
First Line of Code
Studied Software Engineering at University of the Punjab. Built a foundation in CS fundamentals, algorithms, and system design — graduating in 2023 ready to ship real software.
Joined Devsinc (2023)
Started as Associate Software Engineer, working on a US-based healthcare microservices platform. Maintained Ruby on Rails and Sinatra services in a HIPAA-compliant, distributed architecture serving insurance providers and clinical staff.
Promoted to Software Engineer (2024)
Expanded into Python/FastAPI, AI-driven automation, and Web3. Integrated health device APIs for EHR platforms, built LLM-powered workflow systems, and shipped multi-wallet blockchain integrations — owning full-stack features end-to-end.
What's Next
Passionate about building practical AI-powered features, distributed systems, and developer tooling. Open to remote full-stack roles across product, healthcare, fintech, and AI/ML domains. The best work is yet to come.
It's not about where you start, it's about building something that matters.
// From idea to production, one commit at a time
Featured Projects
Showcasing impactful solutions built for real-world challenges
Healthcare EHR Data Ingestion Platform
Multi-Source Health Device Integration
A multi-source ingestion platform consuming REST and webhook APIs from Fitbit, Omron, Garmin, Oura, Dexcom, and other device providers, normalizing payloads into a standardized EHR schema consumed by insurance and clinical systems.
- ✓Idempotent webhook processors with HMAC validation
- ✓OAuth 2.0 token flows & per-provider rate-limit handling
- ✓Polling, async callbacks & subscription webhook patterns
- ✓Normalized device schemas for insurance & clinical systems
AI-Driven Workflow Automation Platform
LLM-Powered Intelligent Processing
Engineered FastAPI backend services and RESTful API layers exposing LLM model inference to product workflows, enabling automated content generation and intelligent data processing pipelines with high-throughput async job processing.
- ✓FastAPI backend with LLM API integrations
- ✓Async task queues with retry logic & error observability
- ✓Automated content generation pipelines
- ✓Full-stack feature ownership from scoping to production
Web3 Digital Asset Platform
Multi-Wallet Blockchain Integration
Built end-to-end Web3 wallet integration with Reown WebKit, covering multi-wallet authentication, EIP-712 transaction signing, and real-time on-chain status polling between a React frontend and Python backend.
- ✓Multi-wallet authentication & EIP-712 transaction signing
- ✓Real-time on-chain status tracking
- ✓Improved wallet connection UX & error boundaries
- ✓Async blockchain operation state management
Healthcare Professional Social Network
Provider Platform with Payments & Scheduling
Developed Node.js backend APIs integrating Stripe Connect for provider payment onboarding, Calendly webhooks for appointment scheduling, and OAuth 2.0-based Google/LinkedIn SSO on a professional network for healthcare providers.
- ✓Stripe Connect provider payment onboarding
- ✓Calendly webhook-based appointment scheduling
- ✓Google & LinkedIn OAuth 2.0 SSO
- ✓Healthcare professional network platform
Skills & Expertise
A comprehensive toolkit for building modern, scalable applications
Backend Development
Frontend Development
Database & Caching
Cloud & DevOps
APIs & Auth
Web3 & AI
Tools & Technologies
Years Experience
Projects Completed
Users Impacted
Let's Connect
Let's build something amazing together
I'm always open to discussing new projects, creative ideas, or opportunities to be part of your vision. Whether you need a full-stack solution or want to collaborate on something innovative, let's connect!