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Nayem Sarkar

@nayemsarkar

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I build secure, distributed web platforms and payment systems with Java, Spring Boot, Node.js, and React.

Bangladesh

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I've built distributed web platforms and enterprise backend services for ScaleUp Ads Agency and international freelance clients, including secure Stripe and PayPal payment integrations designed to prevent duplicate financial events.

I migrate monoliths into modular microservices, optimize relational queries, and deliver real-time auction, marketplace, and e-commerce systems using Java, Spring Boot, Node.js, React, Docker, and observability tooling.

Experience

Work history, roles, and key accomplishments

Software Engineer (Full Stack)

ScaleUp Ads Agency

Dec 2025 - Aug 2026 (8 months)

Led migration of legacy monolith components into a modular microservices architecture. Architected payment gateway integrations with Stripe and PayPal, optimized SQL queries, and implemented Docker containerization.

Microservices Java Spring Boot Stripe API PayPal API SQL Prisma Docker REST APIs JWT CI CD

Freelance Software Engineer

Independent Contractor / Enterprise Solutions Developer

Feb 2023 - Aug 2025 (2 years 6 months)

Engineered and delivered end-to-end distributed web applications and high-concurrency platforms for international clients. Developed real-time auction systems, distributed marketplaces, and automated e-commerce infrastructure.