Zellur Rahman

Zellur Rahman

AI Engineer  |  8+ Years Software Development Experience

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About Me

Software Developer with 8+ years of experience designing, writing, testing, and maintaining code for scalable enterprise applications, microservices, and web-based systems. Proven expertise in Java, Spring Boot, Angular, and cloud technologies (AWS, Azure), now expanding into AI engineering — building and integrating LLM-powered features, RAG pipelines, and intelligent automation into production systems.

Recently relocated to Canada to join Converjit Technology Inc, where the focus is shifting toward AI engineering: applying machine learning and large language models to solve real-world enterprise problems, alongside continued back end development in Java and Spring Boot.

Work Experience

Software Developer – Converjit Technology Inc (July 2026 – Present)

Design, write, test, and maintain code for cloud-based software solutions using Java and Spring Boot, with a growing focus on AI engineering — integrating large language models, RAG pipelines, and intelligent automation into production systems. Collaborate with cross-functional teams to gather requirements and deliver scalable backend services and RESTful APIs for enterprise clients. Implement CI/CD pipelines using Azure Pipelines and Docker; leverage cloud-native, containerized deployments to ensure high availability and maintainability.

Senior Back End Developer – Allianz Technology (Thailand) Co., Ltd. (January 2026 – July 2026)

Design, write, test, and maintain code for enterprise insurance technology solutions using Java and Spring Boot. Analyze complex business requirements and translate technical specifications into functional software features supporting Allianz's global digital transformation. Implement CI/CD pipelines using Azure Pipelines and Docker; leverage Azure cloud services for containerized deployments ensuring compliance with international insurance regulations.

Software Developer Consultant – United Nations ESCAP (September 2021 – December 2025)

Designed, wrote, tested, and maintained code for scalable UN solutions using Java Spring Boot, Angular, Hibernate, Liquibase, and MariaDB. Developed and maintained robust RESTful APIs that boosted system performance by 40%. Delivered the Sendai Framework Management (SFM) system — a critical platform supporting global disaster risk reduction efforts used by 195 member countries. Wrote comprehensive technical documentation including API specifications and system architecture guides; implemented CI/CD pipelines using Azure Pipelines and Docker.

Software Developer (Java) – Candaian Payroll Services (October 2020 – October 2021)

Designed, wrote, tested, and maintained code for the CBOX Human Resources Management System (HRMS) using Java and Dropwizard. Developed and maintained RESTful APIs for seamless frontend–backend data integration. Implemented microservices architecture ensuring high availability, fault tolerance, and seamless integration with third-party systems.

Software Engineer – Datasoft Systems Bangladesh Ltd. (CMMI-5) (June 2019 – August 2021)

Designed and developed microservices architecture and API Gateways for the TeleCash fintech application using Java Spring Boot, enabling secure high-volume financial transactions for Southeast Bank. Implemented real-time messaging using ZeroMQ (Pub/Sub), engineering the system to handle 100,000+ requests per second. Deployed and configured Linux servers implementing security best practices and monitoring to ensure 99.9% uptime.

Jr. Software Engineer – Nexkraft Limited (March 2018 – May 2019)

Developed, modified, and maintained responsive frontend applications using AngularJS, JavaScript, and CSS. Wrote and maintained REST APIs using Spring Framework and Java 7. Integrated payment gateways (SSLCOMMERZ, IPAY) for local e-commerce applications. Deployed and maintained applications on AWS cloud infrastructure.

Key Projects

Sendai Framework Management (SFM) United Nations

A comprehensive disaster risk reduction data management platform for the UN Office for Disaster Risk Reduction (UNDRR), enabling 195 member countries to monitor, report, and analyze progress on the Sendai Framework targets. Built backend services in Java/Spring Boot; designed data import from Desinventar Loss Database; implemented CI/CD with Azure Pipelines and Docker.

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TeleCash – Mobile Financial Services Fintech

A robust mobile financial services platform for Southeast Bank handling millions of transactions — money transfers, bill payments, and mobile top-ups. Architected microservices and API Gateway; implemented ZeroMQ Pub/Sub for real-time notifications; engineered to handle 100,000+ requests per second with high reliability and low latency.

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PHRBO – Payroll HR Back-Office Enterprise

A Payroll HR Back-Office software solution for Professional Employer Organizations (PEOs), Employers of Record (EORs), and staffing firms. Developed core modules for employee management, attendance tracking, payroll processing, and performance evaluation using Java and Dropwizard microservices.

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NexParc – Online Parking Application Web App

An online parking management application for booking, payment processing, and real-time availability tracking. Full-stack: Java/Spring Framework REST APIs, AngularJS frontend, MySQL database, deployed on AWS.

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