Nahian Ahmed

Software Engineer

πŸ“ Dhaka, Bangladesh β€’ πŸ“ž (+88) 01677035933

βœ‰οΈ nahianofficially@gmail.com
Nahian Ahmed

Software Engineer specializing in building scalable, secure, and high-performance backend systems using Java and Kotlin. I design and develop microservice-based architectures using Spring Boot and Micronaut, building REST and gRPC APIs and event-driven systems with Apache Kafka. I have hands-on experience with PostgreSQL and MySQL, working with JPA/Hibernate, jOOQ, and JDBC to balance performance, flexibility, and maintainability. I build secure backend services using JWT and OAuth 2.0/2.1, with a strong focus on authentication, authorization, and API security. I also have experience integrating LLM-powered features into backend systems using LangChain4j, with an emphasis on production readiness, reliability, and clean design.

Technical Skills

Programming Languages

Java Kotlin

Frameworks & Libraries

Spring Boot Spring MVC Spring Data JPA Spring Security Micronaut gRPC LangChain4j Query DSL JOOQ JDBC

Databases & Storage

MySQL PostgreSQL Redis Elasticsearch PG Vector

Architecture & Patterns

Microservices Monolith Design Patterns SOLID Principles

DevOps & Tools

Docker Kubernetes Helm Apache Kafka Git GitHub Actions JWT OAuth2.0

Professional Experience

Software Engineer

IdeaScale
Java β€’ Kotlin β€’ Spring Boot β€’ Micronaut β€’ gRPC β€’ Kafka β€’ Kubernetes
  • πŸš€ Contributed to development and scaling of large-scale SaaS platform serving 4.5+ million users globally, focusing on backend reliability, performance, and integrations
  • ☁️ Designed and implemented cloud-native microservices using Java (Java 11+), Kotlin, Spring Boot, and Micronaut, deployed on Kubernetes with Docker
  • πŸ”Œ Built and maintained REST and gRPC-based microservices, enabling efficient inter-service communication and platform extensibility
  • ⚑ Implemented event-driven architectures using Apache Kafka and Redis for asynchronous processing and caching
  • πŸ”— Integrated backend services with third-party platforms including Salesforce, Slack, Microsoft Teams, and HubSpot, ensuring secure and reliable data exchange
  • πŸ” Worked with Elasticsearch to support search, analytics, and high-performance querying use cases
  • πŸ” Developed and maintained secure APIs using JWT and OAuth 2.0/2.1 for authentication and authorization
  • πŸ€– Built an MCP (Model Context Protocol) server and developed AI agents using LangChain4j, integrating LLM-powered capabilities into backend services with focus on production readiness and observability

Software Engineer

ζ ͺεΌδΌšη€Ύγ‚±γ‚€γ‚±γƒ³γ‚·γ‚Ήγƒ†γƒ  (Keiken System Ltd)
Java β€’ Spring Framework β€’ MySQL β€’ JPA
  • 🏒 Developed and maintained comprehensive ERP system for Japanese clients, delivering robust and scalable business solutions
  • βš™οΈ Built backend services using Java 8, Spring Framework, JSP, MySQL, and JPA, ensuring efficient data management and system performance
  • πŸ”„ Implemented batch processing jobs to automate repetitive tasks and optimize system workflows
  • πŸ” Developed secure authentication and authorization mechanisms using Spring Security and JWT to protect sensitive business data
  • 🀝 Collaborated closely with front-end developers to integrate user interfaces with backend services, ensuring seamless full-stack functionality

Intern – Software Engineer

ULTRA-X, INC.
PHP β€’ Laravel β€’ JavaScript β€’ HTML/CSS β€’ AJAX
  • πŸ’» Contributed to in-house software development projects, gaining hands-on experience in full software lifecycle
  • 🌐 Worked with web technologies including PHP, Laravel, JavaScript, HTML/CSS, and AJAX to develop and maintain web applications
  • πŸ› Assisted in debugging, testing, and enhancing application features to improve performance and user experience
  • 🀝 Collaborated with senior developers to learn best practices in coding standards, version control, and project workflows

Education

Bachelor of Science

Daffodil International University
Computer Science and Engineering
πŸ† CGPA: 3.88/4.00

Interests & Hobbies

Learning New Technologies

Always exploring cutting-edge frameworks and tools

Gaming

Enjoying strategic and adventure games

Cinema

Passionate about storytelling through films