name        : Abdullah Al Masud Tushar
role        : Senior Software Engineer — Backend-Heavy Full-Stack & Data Engineering
location    : Dhaka, Bangladesh 🇧🇩
experience  : 7+ years remote collaboration with European business across green energy, recruitment & transportation
focus       : Backend Architecture · Distributed Systems · Cloud Infrastructure · Data Engineering

• 📉 Reduced cloud infrastructure costs by 75% through API optimisation, query tuning & caching

• 🌳 Owned org-unit management, solving complex hierarchical data operation with MPTT — reducing query complexity O(N) → O(1)

• 🔒 Secured exposed customer data in S3 buckets with proper ACL configuration & dynamic URL dispatcher, closing a critical vulnerability with minimal UX disruption

• 🔄 Implemented & maintained 20+ Airflow DAGs orchestrating end-to-end data pipelines — scheduling, retries & dependency management across multiple data sources

• 📈 Built Python pipelines to ingest, transform & publish 500+ time-series curves for internal teams & external customers

• 🧠 Anthropic CCAR-F Certified — Score 770/1000 — architecting, building & reasoning about production-grade agentic systems with Claude: agentic loops, multi-agent orchestration, tool/MCP design, prompt engineering & context management

• ☁️ AWS Certified — 15+ AWS services in production across multiple enterprise platforms

• 👨‍🏫 Mentored 20+ junior engineers on backend systems, cloud & distributed design and 100+ university students in algorithms and data structures over multiple years

• 🏆 Competitive programmer — HackerRank 2237 · CodeChef 2001 · Codeforces 1554

🐍 break-the-ice-with-python — 100+ Python problems with detailed solutions. 3,100+ ⭐ · 1,500+ forks — helping thousands of developers learn Python fundamentals.

  

🤖 rag-app / Marginalia — Chat with your documents. Upload PDFs or markdown, get streamed answers with inline citations pinned to the source passage. Built with Next.js, Gemini embeddings & SQLite vector store.

  

LinkedIn Professional network & work experience

Email For direct communication & project inquiries

⭐ If you find my work useful, consider giving a star to my repositories!