Backend Engineer · Dhaka, Bangladesh

Saikat Kumar Gain

Backend engineer at Dhrubok Infotech, building reactive Java services on Spring WebFlux, Kafka, and Neo4j.

  • Intern → engineer in 3.5 months
  • 3 peer-reviewed papers, one in a Q1 journal
  • 9-service microservices backend in production
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OrderService.java
// non-blocking, back-pressured, fails soft
public Mono<Order> place(Command cmd) {
  return inventory.reserve(cmd.items())
      .flatMap(orders::persist)
      .doOnSuccess(events::publish)
      .timeout(Duration.ofSeconds(2))
      .onErrorResume(this::compensate);
}
Experience

Work

Saikat Kumar Gain

I build backend systems in Java and Spring Boot. Most of my current work is reactive — non-blocking APIs on Spring WebFlux and Project Reactor, event-driven messaging over Apache Kafka, and graph data modelling in Neo4j.

I care about the parts that are hard to see: what happens under concurrent load, where a service degrades instead of failing, and whether the next person to read the code can follow it. Alongside engineering I publish research — three peer-reviewed papers so far, one in a Q1 journal.

Junior Backend EngineerCurrent

Jan 2026 — Present

Dhrubok Infotech Service Ltd

  • Build non-blocking REST APIs with Spring WebFlux and Project Reactor, raising throughput under concurrent load.
  • Model and query connected data in Neo4j; handle service-to-service messaging with Apache Kafka.
  • Integrated Firebase Cloud Messaging for push delivery inside a multi-module Maven build.
  • Work in an Agile team with branch-per-change, pull requests, and code review.

Backend Developer Intern

Sep 2025 — Dec 2025

Dhrubok Infotech Service Ltd

  • Shipped production Java backend features using reactive patterns.
  • Promoted to Junior Engineer after 3.5 months.
EducationBSc Computer Science & Engineering, IUBAT Dhaka · 2022—2025 · CGPA 3.86/4.00
Selected work

Projects

Each has a written case study covering the architecture and the decisions behind it.

More on GitHub

Experiments, smaller services, and open-source work.

View profile
Research

Publications

Peer-reviewed conference papers and journal articles.

Publications will appear here once added from the admin panel.

Toolkit

Skills

Backend
JavaSpring BootSpring WebFluxSpring SecurityJPA / Hibernate
Data
MySQLNeo4jRedisPostgreSQL
Messaging
Apache KafkaFirebase FCM
Platform
DockerGitMavenJUnit
Certifications
Java Spring Boot, REST API DevelopmentICT Division, Bangladesh · 2024DevOps WorkshopOstad, Bangladesh · 2025Python WorkshopBASIS Students Forum, IUBAT · 2025
Notes

Writing

On backend development, Java, and things that broke.

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Get in touch

Contact

Open to backend engineering roles. Send a message and I'll reply.

Emailsaikatgain.cse@gmail.comLinkedInsaikat-kumar-gainGitHubSKgainWhatsApp+8801581020914Phone+8801581020914
Saikat Kumar Gain — CV
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