Skills Projects Experience Contact
Available for work

Sadman
Rafi

Backend developer crafting scalable systems, resilient APIs, and clean data pipelines. I turn complex infrastructure problems into elegant, maintainable code.

4+
Years exp.
20+
Projects
99%
Uptime SLA

Skills & Tech

My core backend stack — carefully chosen for reliability, performance, and developer experience.

⚙️
Languages

Fluent in backend languages that scale from prototypes to production.

Python Go Node.js TypeScript Bash
🗄️
Databases

Comfortable with relational, document, and in-memory stores.

PostgreSQL Redis MongoDB MySQL Elasticsearch
🔗
Frameworks & APIs

Building REST and event-driven APIs that are fast and well-documented.

FastAPI Django REST Express gRPC GraphQL
☁️
Infrastructure

From containerization to CI/CD pipelines and cloud deployments.

Docker Kubernetes AWS Terraform GitHub Actions
📨
Messaging & Queues

Asynchronous, fault-tolerant communication between services.

Kafka RabbitMQ Celery SQS
🔒
Security & Auth

Designing secure, token-based authentication and authorization flows.

JWT OAuth 2.0 OpenID Connect Rate Limiting

Featured Projects

A selection of systems I've architected and shipped.

🚦
API Gateway Service

A high-throughput reverse proxy with rate limiting, JWT validation, and request routing built in Go. Handles 50k+ req/s with sub-ms latency.

📦
Order Processing Pipeline

Event-driven microservice pipeline using Kafka for real-time order ingestion, enrichment, and fulfillment orchestration for an e-commerce platform.

🔍
Search Microservice

Full-text search backend with typo-tolerance, faceted filtering, and autocomplete, powered by Elasticsearch with a FastAPI layer for scoring customization.

📊
Analytics Ingestion Engine

Scalable data ingestion service processing millions of analytics events daily into a time-series warehouse, with deduplication and schema validation.

🔑
Auth Service

Centralized authentication microservice supporting OAuth 2.0 social logins, TOTP-based 2FA, and refresh token rotation with device fingerprinting.

🤖
Job Scheduler

Distributed cron-like scheduler with dependency graphs, retry strategies, and a web dashboard for monitoring job execution history and alerting.

Experience

Companies and teams I've helped build resilient backend systems.

2023 —
Present
TechCorp BD
Senior Backend Engineer

Lead backend architecture for the core platform serving 500k+ daily active users. Reduced p99 API latency by 42% via query optimization and caching strategies. Mentoring a team of 4 junior engineers.

2021 —
2023
Startup Hub Dhaka
Backend Developer

Built and maintained microservices for a fintech product handling payment processing and ledger reconciliation. Designed the event sourcing pattern for audit compliance.

2020 —
2021
Freelance
Backend Consultant

Delivered REST APIs and database schemas for 8 client projects ranging from SaaS dashboards to e-commerce backends. Stack: Django, PostgreSQL, AWS EC2.

Let's Build
Something.

Open to backend engineering roles, consulting, and interesting collaboration.