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Sayed MD Fahim Fahad

@sayedmdfahimfahad

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Senior backend engineer building scalable Java/Spring systems and APIs.

Bangladesh

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What I'm looking for

I’m looking for a team where I can own backend APIs end-to-end, improve performance and reliability, and solve production issues with root-cause focu analysis using Java/Spring and AWS in a collaborative, remote friendly environment.

I’m a backend-focused engineer with 9+ years of experience building and shipping production systems using Java and Spring Boot, plus 2+ years of frontend development. I’ve worked across monolith, microservice, and event-driven architecture, with 5+ years of AWS experience and hands-on DevOps.

I improve reliability and performance by fixing backend and frontend issues, debugging production problems, and driving root-cause analysis. I’ve delivered major outcomes like payment integration, reporting APIs (xlsx/csv), data migration across ~1.5B rows, safer production releases with feature toggles, and performance wins such as reduced dashboard load time and optimized SQS usage.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Propstream

Oct 2025 - Present (8 months)

Senior Java engineer: built payment gateway for 50K+ users, led 1.5B-row data migration, developed reporting APIs, and implemented feature toggles. Stack: Java, Spring Boot, PostgreSQL, React, AWS.

Java Spring Boot Payment Gateways Data Migration Database Migration Performance Optimization AWS RDBMS Monitoring

Current

Senior Software Engineer

Current

Toptal

Apr 2021 - Present (5 years 2 months)

Senior freelance engineer via Toptal, working with US-based clients remotely. Delivered full-stack features, backend systems, payment integrations, and data migrations for multiple product companies.

Frontend Development Refactoring Performance Optimization User Experience (UX)REST APIs Version Control Testing Debugging

Senior Software Engineer

PianoTrax

Nov 2024 - Sep 2025 (10 months)

Frontend developer for an online music platform's admin portal. Delivered new features, resolved UX issues, refactored codebase, optimized performance. Stack: Next.js, Shadcn, React Query.

Next.js Shadcn React Query Strapi AWS REST APIs

Backend Developer

GrowthDay

May 2021 - Jun 2024 (3 years 1 month)

Senior Java engineer at a US personal development startup. Built core platform, notification service, and signup flow; improved DAU by 5%. Stack: Java, Spring Boot, AWS, MongoDB, Kafka.

Java Spring Boot MongoDB AWS

Senior Software Engineer

TigerIT Bangladesh LTd

Feb 2020 - Aug 2021 (1 year 6 months)

Senior engineer: designed back-end architecture, led API development team, improved internal data flow and security, built apps from scratch. Stack: Java, Spring Boot, Elasticsearch, MySQL.

Java Spring Boot MySQL PostgreSQL Elasticsearch

Software Engineer

Dmoney Bangladesh Limited.

May 2017 - Jan 2020 (2 years 8 months)

Backend engineer at a digital payments startup. Built core financial engine, external payment gateway with bank integrations, and 4 microservices. Stack: Java, Spring Boot, Oracle.

Java Spring Boot Oracle Microservices

Software Engineer

BJIT Ltd.

Jun 2016 - Apr 2017 (10 months)

Software engineer: developed a client tool from scratch per business requirements, built data-driven client application, collaborated in a structured team environment. Stack: Java, Spring Boot.

Java Spring Boot MySQL