Real estate
Real Estate Operations Platform
Modernizing a decades-old real estate platform: 50M+ records from ASP.NET/MSSQL to NestJS
- Amazon Web Services (AWS)
- React
- Nest JS
- Redis
Sifat RabbiStaff Software Engineer · Remote, Full-Time
I build and run production systems for remote teams in healthcare, fintech, and AI, from architecture through deployment.
Open to full-time and part-time remote roles
- Core query on a 50M-row system
- 60s → 500ms
- Records moved off ASP.NET
- 50M+
- Toptal-vetted engineers
- Top 3%
- Years in production
- 7+
Work
Selected work
Production systems with architecture, constraints, and measured outcomes.
Career
Experience
7 years across 11 roles.
Dec 2025 – Present
CurrentSenior Software Engineer
- Architected and delivered the entire platform from scratch, covering front end (Next.js), back end (Payload CMS and API routes), PostgreSQL database design, third-party integrations, and production deployment on Netlify.
Aug 2025 – May 2026
Full Stack Developer
Clerk Data LLC (Via Toptal)·9m
- Migrated a legacy ASP1/MS SQL application to a modern NestJS/React stack, eliminating technical debt from a Windows 95-based system and establishing a scalable, cloud-native architecture on AWS.
Jun 2024 – Jan 2025
Full-stack Engineer | Health Benefits Product
- Improved scalability to meet client's requirements.
Jan 2023 – Apr 2023
Full-stack Engineer
A Toptal Client·3m
- Developed multiple apps using Next.js with serverless functions.
Testimonials
What people say
From clients and people I've worked with.
“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.”
UC
Upwork Client
Client on Upwork
Client
“He is someone you can rely on to finish any tasks on his own. He not only does the work assigned, but also shows proactiveness in suggesting better alternatives.”
YS
Read full recommendation on LinkedInYemin Sajid
Co-Founder, CEO at Greentech Apps Foundation
Worked together
“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.”
MN
Read full recommendation on LinkedInMd Ashif Al Nowajesh
Senior AI Solution Architect
Worked together
Writing
Recent writing
First-hand notes from production work, interviews, and tools I actually used.
Jun 20, 2026
Doppler Review
I switch between my Linux desktop and MacBook all the time, and syncing env variables across devices used to be such a pain. Here's how Doppler fixed that for me, with just a few commands.
TechnologyMay 24, 2026
Typing DNA - My First AI tool in Software Engineering
The first AI tool I ever worked with as a software engineer wasn't ChatGPT or anything close to it. It was TypingDNA, a tool that identifies you by the unique rhythm of your typing, and I helped the team to integrate it into an exam proctoring system with only 6 months of experience under my belt.
TechnologyApr 29, 2026
My Competitive Programming Journey
From writing C# applications in Class 6 to reaching Codeforces Blue and solving more than 5,000 problems, competitive programming has shaped the way I think as a software engineer.
Competitive Programming
Contact
Let's work together
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.