Hi, I'm Hasan đź‘‹
Senior Software & AI Engineer with 5+ years of experience. Expert in building SaaS platforms, architecting LLM pipelines, and building scalable, high-performance solutions
HA

About

Senior Software Engineer with 5+ years of experience, specializing in end-to-end SaaS design, development, and delivery. I architect AI-driven platforms, including LLM pipelines, RAG systems, and scalable cloud infrastructure, from concept to production. I combine strategic system design with disciplined execution, delivering complex projects on schedule, cutting costs by up to 40%, and scaling to millions of users. I’ve led multi-quarter modernizations, designed high-volume payment systems, and built AI features that boost engagement and revenue.

Work Experience

3

3Ssolutions

April 2023 - Present
Team Lead & Senior Software Engineer
As the Technical Lead, I architected and executed modernization strategies for multiple SaaS platforms, transitioning legacy monoliths into scalable microservices architectures. This involved leading a full-stack team of 15+ engineers through complex, multi-quarter migrations and high-scale optimizations.

For a major EdTech platform, I replaced a legacy system suffering from critical scalability issues with a modern React and Ruby on Rails architecture. I implemented an incremental migration strategy, routing traffic route-by-route to the new application while handling unified authentication across both repositories simultaneously. I introduced a Query Pattern to decouple business logic, allowing us to refactor the schema and migrations seamlessly after the shift. The result was a 60% reduction in infrastructure costs and a performance improvement from 15s to 1-2s page loads.

For a high-traffic event management system, I designed a robust Ticket Inventory System to handle concurrency during massive traffic surges of million monthly users. I led a campaign to optimize database queries and page loading speeds.

Additionally, I integrated Elasticsearch to power Natural Language and Full-Text Search, optimizing it to query millions of records at snap speed. I also architected advanced AI pipelines—including LLM fine-tuning and RAG systems—and implemented FFmpeg to power robust cross-platform media pipelines.
S

Southville Solutions

July 2021 - April 2023
Software Engineer
I engineered scalable backend services for enterprise B2B applications, focusing on domains requiring high integrity, such as fintech and HR. I utilized Docker for containerized environments and managed persistent storage using AWS EBS to ensure system reliability.

I developed core financial infrastructure for a fintech solution, implementing secure checkout and batch settlement logic. For a workforce management platform, I built real-time features and complex multi-state compliance workflows.

I contributed to the backend architecture for a community engagement platform, collaborating with product teams to translate business requirements into robust technical solutions. Additionally, I implemented CloudFront versioning strategies to ensure instant updates and efficient content delivery. A key part of my role involved fostering team growth; I provided hands-on mentorship to juniors and training for interns, guiding them on development workflows and coding best practices.
T

TeachCreatix

January 2021 - July 2021
Associate Software Engineer
I contributed to full-stack feature development for educational technology products, working with React on the frontend and Ruby on Rails on the backend. I collaborated within an agile team environment, participating in daily stand-ups, sprint planning, and code reviews to deliver user-facing features and maintain application functionality.

This role provided foundational experience in RESTful API integration, webhook implementation, database management, and configuring Nginx servers on AWS within a production SaaS environment.

Education

C

Comsats University

2016 - 2020
Bachelor's in Software Engineering
P

Punjab College

2014 - 2016
FSC Pre-Engineering

Skills

Languages

Ruby
Python
Typescript

Frameworks

Ruby on Rails
FastApi
React
Next.js
Node.js

AI

LLM Fine-tuning
RAG Systems
LangChain
Prompt chaining
OpenAI API
AI Agents

Databases

PostgreSQL
MongoDB
MySQL
Redis
Elasticsearch
Vector DBs

Infrastructure

Docker
AWS (EC2, RDS, S3, Lambda, VPC, CloudFront)
Nginx
Cloudflare Workers
CI/CD Pipelines
Jenkins
Digital Ocean
My Projects

Check out my latest work

I've worked on a variety of projects, from simple websites to complex web applications. Here are a few of my favorites.

Upcoming Events

Upcoming Events

Event-discovery and ticketing / registration platform that scales to large traffic and supports organizers in listing events, ticket sales, and event management.

Ruby on Rails
ECS/Fargate
PostgreSQL
Redis
Docker
CloudFront (CDN)
Payments (Apple Pay, PayPal, Stripe)
Piqosity

Piqosity

Adaptive online learning & test-prep platform offering personalized math/English lessons and full-length practice tests (ISEE, SAT, ACT) with virtual tutoring, adaptive exercises, and analytics-driven learning paths.

Ruby on Rails
React
Microservices
Elasticsearch
PostgreSQL
Node.js
AWS EC2
Nginx
Redis
QuickCard

QuickCard

QuickCard offers a “cashless checkout” / payment-infrastructure solution with blockchain-secure checkout, batch settlement, and support for multiple payment flows (ACH, Push-to-Card, E-Check).

Ruby on Rails
Microservices
Elasticsearch
PostgreSQL
Blockchain
Stripe Connect (ACH/P2C/E-CHECK)
Redis
Etyme

Etyme

An enterprise B2B staff-agency / workforce-management platform — digitizes HR workflows, multi-state compliance, payroll and staffing operations into unified interface (ideal for agencies and staffing firms).

Ruby on Rails
MySQL
Real-time Sockets
Multi-State Compliance Logic
Evyai

Evyai

EvyAI is an AI-powered content / social-posting assistant (web + extension) helping users generate posts, comments, and manage social-media / networking content.

Python
FastAPI
React
RAG Architecture
LLM Fine-tuning
LangChain
Pinecone
MongoDB
Draftr

Draftr

Draftr is a no-code website builder for solopreneurs: a simple platform to launch a personal / content site (blog / link-in-bio / newsletter) aimed at writers, creators, bloggers, schools, and small orgs.

Next.js
Ruby on Rails
MySQL
LangChain
RAG
Vector DBs
Elftapes

Elftapes

Elftapes is a self-tape / audition-media platform: a “self-tape sidekick” built for actors, helping record, rehearse, and submit audition tapes — using AI tools to simplify the self-tape process.

Next.js
NodeJs
FFmpeg (Server-side Synthesis)
ElevenLabs API
OpenAI
Tesseract/Textract (OCR)
Cloudinary
CI/CD Pipelines
Cloudflare Workers
Fazier

Fazier

A product launch community platform for indie developers. Built for real-time engagement with nested discussions, voting logic, and a scalable Kubernetes backend.

Next.js
Python
FastAPI
PostgreSQL
AWS Lambda
Nginx
EC2
CI/CD Pipelines
Case Studies

My Approach in Action

Here are a few stories of how I've turned complex challenges into impactful solutions.

The Piqosity Modernization: Incremental Rewrite & 40% Cost Reduction

The Challenge

The legacy platform was built on an outdated stack that could not scale. It faced critical constraints including high infrastructure costs and cripplingly slow response times (8s-15s latency). the old architecture prevented the development of flexible features like dynamic assessments, and the code was too brittle to maintain efficiently.

My Solution

As the Technical Architect, I owned the modernization strategy, moving from the legacy monolith to a modern React and NodeJs ecosystem:

1. Route-by-Route Migration (Strangler Fig): Instead of a "big bang" rewrite, I orchestrated an incremental switchover. We moved traffic route-by-route to the new app, ensuring zero downtime. I architected a bridge to handle unified authentication on both repos simultaneously, keeping user sessions synced across the legacy and new systems.

2. Query Pattern & Schema Optimization: I implemented a strict Query Pattern to decouple business logic from the database early on. Once all routes were shifted, this allowed us to cleanly update the database schema and migrationsto a modern standard without breaking the application logic.

3. Dynamic Assessment Engine: Leveraged the new schema flexibility to design a complex relational engine allowing organizations to build custom quizzes with dynamic question types and versioning.

4. Performance & Scale: Integrated Redis for non-runtime calculations and optimized all data-access layers, resulting in massive speed gains.

Key Takeaways

  • Business Impact: Reduced monthly infrastructure cost by 40% while unlocking B2B revenue streams through the new Organization/Teacher tools.
  • User Experience: Cut median page load time from 15s to 1-2s, directly improving key retention metrics.
  • Technical Feat: Executed a risk-free, incremental migration while maintaining data consistency and auth across two live production environments.
Contact

Get in Touch

Want to chat? Just shoot me a message LinkedIn and I'll respond as soon as possible.