Your SaaS backend was built to ship. Not to scale.

At 10× users, schemas crack, cron jobs fail silently, and your best engineer becomes a full-time firefighter.

I fix that on contract, before it costs you a quarter.

With 7+ years building production backends across SaaS, fintech, real estate, and e-commerce, here’s what I actually deliver:

What I’ve Built & Improved

Architected 3 production platforms from scratch ERP, CRM, and property investment platforms, reaching 10,000+ active users within 6 months
Cut API response time from 200ms → 20ms Redesigned horizontal and vertical scaling under real concurrent load
Reduced database load by 60% at peak traffic Through PostgreSQL query optimization and Redis caching
Automated CI/CD pipelines Turned multi-hour manual releases into 15-minute automated deployments
Built AI agent systems & RAG pipelines Using OpenAI and Anthropic APIs to replace manual operational workflows for clients moving beyond basic automation

Stack I Work With Daily

Node.js · NestJS · TypeScript · PostgreSQL · MongoDB · Redis · AWS · Docker · Kafka · BullMQ · Socket.io · Drizzle ORM · OpenAI API · Anthropic API · GraphQL

AWS

EC2 · RDS · S3 · ALB

What Makes This Different

I work alongside a dedicated frontend specialist.

When clients need full-product delivery across frontend, backend, QA, and deployment, we cover the entire product lifecycle without the overhead of a traditional agency.

I also care about what happens after I leave:

I document architecture decisions so the next team isn’t reverse-engineering my choices.
I write code reviews that juniors can actually learn from.
I focus on production reliability, maintainability, and measurable performance, not just getting features shipped.

Available for Contract & Fractional Work

Remote-first · Any timezone

Email: devhasibulislam@gmail.com Portfolio: devhasibulislam.vercel.app