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Sadat Arefin Rafat

Senior Software Engineer

Senior Software Engineer | .NET Core & Microservices Expert | Cloud Architecture Specialist

Hey there! I'm a senior full stack engineer with 3+ years of experience specializing in .NET Core, microservices architecture, and distributed systems. I build scalable enterprise applications using C#, Azure, Docker, and Kubernetes that don't fall apart at 3 AM. When I'm not debugging production issues, I'm probably reading tech blogs or trying to convince my team that yes, we really do need another monitoring dashboard.

.NET Core & C# Expert Microservices Architecture Azure & AWS Cloud Docker & Kubernetes Distributed Systems
Check out my work Let's talk

Fun facts about my work:

🚀 Built a multi tenant POS system handling 100K+ daily transactions with offline sync (because internet isn't always reliable)

⚡ Made Revit model syncing 80% faster (from 25 minutes to just 5 minutes)

👥 Led a team of 4 engineers while improving CI/CD pipelines and hitting 99.9% uptime (the 0.1% was probably my fault)

About Me

Happy moment Beach vibes Book collection

I'm the kind of engineer who gets excited about well designed APIs and proper error handling. My sweet spot is translating messy product requirements into clean architecture that actually makes sense six months later. I build event driven microservices, offline first systems and secure multi tenant platforms (yes, I know multi tenant is hard, that's why it's fun).

When I'm not writing code, you'll find me mentoring junior engineers (teaching others helps me realize how much I've learned), fine tuning CI/CD pipelines (because manual deployments are so 2015) or setting up monitoring dashboards (I like knowing about problems before users do). I also enjoy traveling, reading tech books and pretending I understand all the latest JavaScript frameworks.

💪 Core Strengths

  • ✓ System Design & Architecture (Microservices, CQRS, DDD)
  • ✓ Backend Engineering (.NET, Django, FastAPI)
  • ✓ Cloud Infrastructure (Azure, AWS, Docker, Kubernetes)
  • ✓ Database Design & Optimization
  • ✓ API Design & Integration

🎯 Key Contributions

  • • Helped build offline-first POS handling 100K+ transactions
  • • Contributed to 80% sync performance improvement
  • • Supported team achieving 95% customer satisfaction
  • • Mentored junior engineers & improved workflows
  • • Worked on CI/CD pipelines & deployment optimization

📚 Reading Interests

Favorite Genres & Authors:

Islamic Books Bangla Thrillers English Thrillers Mystery

📖 Love reading: Dan Brown, Rick Riordan, Harry Potter series

🗺️ Travel Adventures (API Testing in Real Life)

Explored Destinations (Status: 200 OK):

Chittagong Rangamati Sitakunda Sylhet Mymensingh Tangail Manikganj Old Dhaka

// Debugging life one city at a time 🧳

🍜 Food Adventures (Load Testing My Stomach)

🌮 Street Food Explorer: Finding the best bugs... I mean, flavors in town

🚶 Random City Walking: When GPS fails, adventure begins

☕ Cafe Hopping: Testing coffee APIs across the city

🍽️ Menu Experimenter: Always deploying new taste features to production (my mouth)

// TODO: Try that new restaurant everyone's talking about

🎌 Anime Enthusiast

⛵ Currently sailing with One Piece

✨ Big fan of Isekai adventures

// Binge-watching like it's a CI/CD pipeline

😴 Recovery Mode (Sleep.exe)

💤 Power Naps: Restarting my brain service

🔋 Recharge Sessions: Because even servers need downtime

🛌 Sleep Debugging: Fixing memory leaks in my head

// Sleep is not a bug, it's a feature for better performance

✨ Words of Wisdom

"Let yourself be silently drawn by the strange pull of what you really love. It will not lead you astray."

— Rumi

"The wound is the place where the light enters you."

— Rumi

"Hazaaron khwahishen aisi ke har khwahish pe dam nikle / Bahut nikle mere armaan lekin phir bhi kam nikle"

(A thousand desires, each worth dying for... many of them I have realized, yet I yearn for more)

— Mirza Ghalib

Professional Experience

RL

Refactor Logic

Senior Software Engineer (Project Based)

📍 Remote · 📅 Aug 2025 – Present

POS Systems Automation
  • ▸ Architected microservices POS (RefactorPOS) evolved from Modular Monolith with offline first design supporting 100K+ daily transactions and multi tenant database
  • ▸ Built event driven pipelines with RabbitMQ and implemented robust conflict resolution for offline sync (because reliable internet is a myth)
  • ▸ Introduced CI/CD with Azure DevOps, reducing deploy cycles and increasing test coverage (fewer 3 AM emergency calls)
  • ▸ Led product planning and coached 5 software engineers, improving delivery predictability and team morale
HI

HawarIT Limited

Software Engineer

📍 Dhaka, Bangladesh · 📅 Aug 2023 – Jul 2025

CAD/BIM GIS
  • ▸ Reduced Revit model sync from approximately 25 minutes to approximately 5 minutes via parallelization and delta sync (80% performance improvement)
  • ▸ Built map editor with Canvas and WebGL handling 8k+ components using quadtree indexing (turns out rendering everything at once is bad)
  • ▸ Designed Azure based auto scaling infrastructure and implemented Microsoft Entra SSO for seamless authentication
  • ▸ Mentored junior developers and shipped orthophoto pipelines for processing large image datasets

Selected Projects

Some interesting things I've built (and actually finished)

🧵

Textile Fabric Weave Detection

Computer vision system for industrial quality control. CNN model with 97% accuracy and real time pipeline running at 30 FPS (because nobody has time to manually inspect thousands of fabrics).

Python TensorFlow FastAPI OpenCV Docker React
💰

Financial Analysis Copilot

RAG based AI assistant for financial documents with multi agent orchestration and visual reporting. Makes sense of complex financial data so you don't have to.

LangChain OpenAI Streamlit PostgreSQL
💳

Refactor Pay Payment Gateway

Distributed payment system designed for 5K transactions per second with saga pattern orchestration and fraud detection under 200ms. Money is important, so this better work right.

.NET Core PostgreSQL Kafka Redis React
📊

BizOps Central

Multi industry business management platform with POS, inventory management, reporting dashboards, payroll and tenant management. Everything a business needs in one place.

.NET Core Blazor Azure SQL SignalR

🎓 Education

Bachelor of Science in Computer Science & Engineering

Islamic University of Technology (IUT)

📅 January 2019 – May 2023

Research Focus: Image and Video Super Resolution with Deep Learning

(Learned that making blurry images sharp is harder than it looks)

🌍 When I'm Not Coding

Travel adventure Tech event

I enjoy traveling to new places, attending tech conferences and meetups, reading technical books (and sometimes actually finishing them), and exploring new technologies. Also a big fan of deep conversations about system design.