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Amimul Ehsan

@amimulehsan

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I build high-throughput payment, commerce, and backend platforms in Java and Go.

Bangladesh

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What I'm looking for

I'm looking to build high-quality, scalable software where I can lead backend and payment-platform work, mentor engineers, and foster innovation.

I'm building payment infrastructure at bKash Limited x Inument Solutions Limited, where I took over the Direct Charge project to enable PIN-free customer payments. I re-engineered its gateway module, improving speed by 10% and enabling 5,000+ additional daily transactions.

I've upgraded Java from 8 to 21 and DynamoDB from 1.x to 2.x, added mandate management, created a development-side CI/CD pipeline, and introduced lock management to prevent fraudulent transactions.

At Sayurbox, I built virtual bundle and campaign-management capabilities that contributed to 20% revenue growth and 15% market-share growth in the initial quarter. I also reduced login failures by 80% with Redis Bloom Filter, optimized 50+ database queries, mitigated deadlocks and memory leaks, and led five engineers building an HTTP request scheduler.

Earlier at Techstone and ShopKpr, I migrated services to AWS ECS, built CI/CD workflows, integrated payment systems, led monolith-to-microservice migration, and moved Spring applications to reactive architecture. I build scalable backend systems across Java, Spring Boot, Go, AWS, databases, messaging, and containers.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Bkash Limited X Inument Solutions Limited

Jun 2024 - Present (2 years 3 months)

Took over the Direct Charge project, enabling PIN-free payments. Upgraded Java and DynamoDB, re-engineered the gateway module, and introduced a lock management system to prevent fraud.

Java DynamoDB CI CD Lock Management Gateway Optimization

Software Development Engineer - 2

Sayurbox

May 2022 - May 2024 (2 years)

Implemented virtual bundle strategy and campaign management system, achieving 20% revenue growth. Resolved memory leak and database deadlock issues, optimized queries, and implemented Redis Bloom Filter for login performance.

Java Redis Bloom Filters Database Optimization Distributed Systems Redisson Campaign Management

Software Engineer

Techstone Limited

Nov 2021 - May 2022 (6 months)

Redesigned database to 4th normal form, migrated services to AWS ECS, and implemented CI/CD with GitHub Actions. Integrated payment gateways and automated SMS and payment systems.

Database Design AWS AWS ECS Docker GitHub Actions CI CD WebSockets Payment Integration

Backend Developer

Shopkpr

Nov 2019 - Nov 2021 (2 years)

Led KYC-based passwordless verification, reducing registration time from 3 minutes to 30 seconds. Led monolith to microservices transition and migrated to reactive Spring, leveraging Azure to save 20% server budget.

KYC Microservices Spring Boot Reactive Programming Azure Java