Md. Mohacel Hosen

Java Backend / Spring Boot Engineer

Dhaka, Bangladesh · Open to International Remote Opportunities

016-0136-3345 · mohacel.hosen22@gmail.com

Professional Summary

Java/Spring Boot Developer with nearly 3 years of professional experience building enterprise applications, REST APIs and full-stack solutions. Hands-on experience with Spring Boot, Spring Security, PostgreSQL, Redis, Angular, Docker and Linux, with strengths in API performance optimization, database analysis, system integration, platform upgrades, deployment and production troubleshooting. Currently working at Walton on enterprise digital systems including Smart Sales, AWAZ and HRM/HRMS integrations. Comfortable collaborating with cross-functional teams and delivering business-critical features in fast-paced environments.

Core Technical Skills

Programming: Java, Kotlin, JavaScript, TypeScript, Python, Bash
Backend: Spring Boot, Spring Web, Spring Data JPA, Spring Security, Spring WebFlux, Spring Cloud, Spring Batch, REST APIs, WebSocket
Frontend: Angular, AngularJS, HTML5, CSS3, Bootstrap, Tailwind CSS
Database: PostgreSQL, Oracle, MySQL, MongoDB, SQL, query optimization, database analysis
Performance: Redis, API latency monitoring, response-time optimization, Java concurrency, thread pools
DevOps: Linux, Docker, Nginx, Jenkins CI/CD, Tomcat, VPS/server deployment, logging and troubleshooting
Security & Integration: OAuth 2.0, Spring Security 6, authentication/authorization, SMS OTP, payment gateway, enterprise API integration

Professional Experience

Senior Assistant Director — Digital System Automation, Walton | Apr 2026 – Present

Corporate Office | Strategic Business Development | Automation Development

Develop backend services using Java Spring Boot and frontend modules using Angular for enterprise business applications.
Design, query and optimize PostgreSQL data stores; analyze database consistency and application-level performance bottlenecks.
Implement Redis caching and performance enhancements to improve API responsiveness and user experience.
Integrate REST APIs and enterprise systems, including Walton HRM/HRMS user-information integration.
Troubleshoot issues across the API, application, database, dependency and runtime/platform layers.
Participate in deployment, debugging, smoke testing, release preparation and performance tuning across test and production environments.
Collaborate with cross-functional teams to analyze requirements and deliver business features on schedule.

Selected Impact

Built an optimized Android customer synchronization API that reduced response time by approximately 90% in the worst-case environment and 87% in the best-case environment versus the legacy customer-list API.
Implemented centralized API response-time monitoring capturing processing duration, HTTP method, endpoint and response status for improved observability and troubleshooting.
Developed Walton HRM user-information API integration and automated HRM user retrieval during Smart Sales user creation.
Completed Spring Boot 2.7.18 release integration and Java 17 smoke testing as part of platform-upgrade readiness.
Improved Java 17 compatibility by removing unsupported JCE reflection from the password encryption/decryption flow.
Reduced technical debt by replacing Markdown4j with CommonMark and updating Commons CSV usage to the Builder API.
Implemented HTTP 426 handling for required client upgrades and delivered AWAZ device-management, dashboard analytics and business-module enhancements.

Software Engineer (Java Team Lead) — Nexkraft | Aug 2024 – Apr 2026

Developed Java/Spring Boot applications for social, health, communication and smart-farming platforms.
Implemented WebSocket functionality, walkie-talkie systems, PDF reporting, SMS OTP and payment gateway integrations.
Worked with Spring Security 6 and OAuth 2.0 for authentication, authorization and application security.
Set up, developed and deployed multiple projects on VPS environments, including server configuration and troubleshooting.
Worked on international projects involving Cloud Stack, Autodesk and Microsoft Cloud Solution Provider ecosystems.
Developed an Online Classroom platform using Angular and Spring Boot and contributed to a Stay Healthy Life platform using Spring WebFlux and Angular.

Backend Developer — Garibaree.com | Mar 2024 – Jul 2024

Implemented Java Mail Sender notifications, Spring Security, PDF/CSV reporting and application bug fixes.
Improved application performance using Java Thread Pool/concurrency techniques.
Developed user-engagement analytics and advanced product search using full-text search.
Supported server setup and migration and implemented multiple security filter chains.

Junior Full-Stack Developer — Lynorg Technologies Limited | Oct 2023 – Jan 2024

Contributed to full-stack application development and supported Linux/Debian, Docker, Nginx, Jenkins CI/CD, logging/monitoring and basic security activities.

Education

B.Sc. (Hons.) in Computer Science & Engineering — Shanto-Mariam University of Creative Technology | 2019–2023
Higher Secondary Certificate (HSC) — Nawab Habibullah Model School & College | 2018

Certifications & Training

Java With System Design and DSA — PWSkills (2023)
Spring Boot with Microservices Project Training — Ashok IT (2022)
Complete Java Masterclass — Udemy (2021)
Web Design and WordPress Theme Customization — SoftTech-IT (2019)

Projects & Achievements

Online Classroom — Angular + Spring Boot web application.
Participated in ICPC 2023 and KYAU National Hackathon 2023.
Top 6 — SMUCT Intra Department Programming Contest (2023).
Top 5 — SMUCT Intra Department Programming Contest (2022).

Target Roles