I led a migration of a legacy ASP.NET/MSSQL system with 50M+ records to NestJS, PostgreSQL, and AWS, cutting a core query from 60 seconds to 500ms. That is the kind of ownership I bring as a Staff Software Engineer with 7+ years of production work across healthcare and fintech.
I work remotely and full-time as a Toptal-vetted engineer (top 3%), owning architecture, development, and deployment end to end for US-based clients. Core stack: Next.js, NestJS, TypeScript, PostgreSQL, AWS, and Prisma, plus FastAPI services for LLM-powered and retrieval-augmented generation features. I hold a Computer Engineering degree from AUST, where I now teach as an adjunct lecturer.
Work
Production systems with architecture, constraints, and measured outcomes.
3 projects · 1 live
Career
7 years across 11 roles.
Dec 2025 – Present
Aug 2025 – May 2026
Clerk Data LLC (Via Toptal)·9m
Jun 2024 – Jan 2025
Jan 2023 – Apr 2023
A Toptal Client·3m
Skills
The stack I reach for on product work, from the UI down to the data layer.
Writing
First-hand notes from production work, interviews, and tools I actually used.
Testimonials
From clients and people I've worked with.
Toptal
Staff Software Engineer at Toptal (remote)
“5000+ hours across long-running remote roles, 8 client teams, 100% client satisfaction.”
Toptal
Upwork Client
Client on Upwork
“Outstanding Web Developer – Expert in TypeScript, AWS, HTML, and CSS. Working with Sifat has been an exceptional experience from start to finish. His deep expertise in modern front-end technologies, especially TypeScript, HTML, and CSS, combined with a strong command of AWS services, made a significant impact on the success of our project.”
Upwork
Upwork Client
Client on Upwork
“Sifat has been delivering excellent value since the beginning. He shared his experience and suggested how we could work together with best standards making it easy all along the project. He delivered an initial version extremely fast so we could provide feedback quick and after some iterations we achieved a solid end version. I really liked his communication skills and that he offered an excellent support.”
Upwork
Yemin Sajid
Co-Founder, CEO @ Greentech Apps Foundation
“Sifat is an avid problem solver and enthusiastic about writing clean codes. He is someone you can rely on to finish any tasks on his own. He also cares about his team members and helping them grow. He shared the same value as our organization during his time with us. He not only does the work assigned, but also shows proactiveness in suggesting better alternatives. Working with him was a great pleasure, and his contributions were pivotal for our organization.”
Md Ashif Al Nowajesh
Senior AI Solution Architect
“I've had the pleasure of working with many professionals in our line of work, but Sifat is someone whom I will always remember fondly. He is a great engineer and an outstanding team player with rich experience in software development and is always willing to lend a hand to anyone who needs it. Any company would be lucky to have Sifat on their payroll”
Rumman Ali
MSc Computer Science @ University of Windsor
“I am delighted to provide this recommendation for Sifat, my exceptional classmate and friend. Throughout our academic journey, I had the privilege of witnessing his remarkable abilities and unwavering dedication. Sifat's problem-solving skills are truly exceptional... He possesses a unique ability to break down problems into manageable components and arrive at innovative solutions.”
Contact
If you're hiring for a remote Staff or Principal role, or building something in healthcare, fintech, or AI, email me and we can talk it through.
Open to full-time and part-time remote roles
Also on Toptal. Email is the best way to start a conversation.
