Rayhanul Rumel
Software Developer
Saarbrücken
Summary
Dynamic Full-Stack Software Developer with over six years of experience designing, developing, and maintaining scalable, cloud-ready web applications. Proven expertise in Angular, Ionic, Google Cloud Function, Node.js, TypeScript, JavaScript, Firebase, MongoDB, and Git, delivering secure and maintainable solutions for business platforms, academic projects, and AI-powered tools. Skilled in full development lifecycle, DevOps practices, CI/CD, and Agile/Scrum methodologies, with a strong commitment to creating performant, user-centric software. Passionate about learning new technologies and contributing to interdisciplinary teams to drive product excellence and innovation.
Overview
11
11
years of professional experience
2
2
Languages
Work History
Software Developer
Mona AI GmbH
08.2023 - Current
Technologies: Angular, Ionic, TypeScript, JavaScript, Node.js, Firebase, Google Cloud Functions, RESTful APIs, OAuth2, OpenAI API, D-ID API, TailwindCSS, Playwright, GitHub, Jira, Confluence, PostgreSQL (Familiar)
- Developed scalable Angular/Ionic applications with responsive, cross-browser, and WCAG-compliant UI using TypeScript, HTML5, CSS3, and TailwindCSS.
- Integrated and designed RESTful APIs and serverless backend services (Firebase, Google Cloud Functions, Node.js) with OAuth2-based authentication.
- Implemented unit, integration, and E2E testing (Playwright, Jasmine, Karma) ensuring high-quality, maintainable code.
- Optimized frontend performance via lazy loading, caching, and bundle reduction, improving UX and speed.
- Collaborated in Agile/Scrum teams, performing code reviews, documentation, and mentoring junior developers.
Student Assistant (Web Developer)
CISPA Helmholtz Center for Information Security
05.2020 - 07.2023
Technologies: HTML5, CSS3, JavaScript, React, Node.js, MongoDB, RESTful APIs, WordPress, Python, MySQL, Excel, Tableau, GitLab, Agile/Scrum, PostgreSQL (Familiar)
- Developed and maintained responsive web applications using React, JavaScript, HTML5, CSS3, and Node.js for research projects.
- Built backend services with Node.js and MongoDB, integrating RESTful APIs for interactive features.
- Designed data visualizations and dashboards using Python, SQL, Tableau, and Excel to enable data-driven insights.
- Supported Agile/Scrum workflows, performing code reviews and version control via GitLab.
Student Assistant (Web Developer)
The Department of Human-Computer Interaction, Saarland University
03.2019 - 07.2020
Technologies: HTML, CSS, Bootstrap, JavaScript, jQuery, WordPress, PHP, SQL, Excel, Tableau, Axure, Agile/Scrum
- Developed and maintained the department website using WordPress, HTML, CSS, Bootstrap, JavaScript, jQuery, and PHP.
- Conducted UX research and prototyping (Axure, surveys) and implemented improvements to enhance user engagement by 20%.
- Analyzed datasets with SQL, Tableau, and Excel, delivering actionable insights for research projects.
- Participated in Agile/Scrum workflows, ensuring timely and high-quality project delivery.
Full Stack Software Engineer
Instalogic Inc.
09.2014 - 07.2015
Technologies: HTML, CSS, JavaScript, Bootstrap, PHP, CakePHP, MySQL, WordPress, Apache, Selenium, Jira, Agile/Scrum
- Built responsive web applications with HTML, CSS, Bootstrap, JavaScript, PHP/CakePHP, and MySQL, improving site performance by 30%.
- Designed and implemented custom WordPress themes and plugins, enhancing UI/UX and functionality.
- Participated in Agile/Scrum development, code reviews, and backlog grooming, delivering 10+ projects on time.
- Conducted automated (Selenium) and manual testing to reduce bugs by 25% and maintain high-quality code.
Education
Master of Science - Computer Science
Saarland University
Saarbrücken, Saarland, Germany 04.2001 -
Bachelor of Science - Computer Science and Engineering
East West University
Dhaka, Bangladesh 04.2001 -
Skills
Frontend: Angular, Ionic, TypeScript, JavaScript, HTML5, CSS3, TailwindCSS, Bootstrap, Responsive & WCAG-compliant UI
Backend: Nodejs, RESTful APIs, PostgreSQL (Familiar), SQL, Firebase, Google Cloud Functions, Serverless Architecture (basic)
DevOps & Tools: Git, CI/CD, Jira, Confluence, Playwright, Unit & Integration Testing
Software Practices: Agile/Scrum, Component-driven architecture, Workflow modeling, Cross-browser optimization, Performance tuning
AI & Integrations: OpenAI API, D-ID API, AI-assisted application features
Collaboration & Documentation: Mentoring, Code reviews, Technical documentation, Team knowledge transfer
Other Skills: UI/UX design, Data visualization, AI integrations (OpenAI API, D-ID API), Mentoring & Documentation
Projects
- Prepify - An AI Assisted Interview Preparation App (Demo: https://interview-prep-app-429f2.web.app/)
- Real or Fake Quiz - An online quiz to identify deep fake images and real images (Play: https://real-or-fake.challenge.saarland/)
- HCI Website - The official website of Human-Computer Interaction, Saarland University (Visit: https://hci.cs.uni-saarland.de/)
Timeline
Software Developer
Mona AI GmbH
08.2023 - Current
Student Assistant (Web Developer)
CISPA Helmholtz Center for Information Security
05.2020 - 07.2023
Student Assistant (Web Developer)
The Department of Human-Computer Interaction, Saarland University
03.2019 - 07.2020
Full Stack Software Engineer
Instalogic Inc.
09.2014 - 07.2015
Master of Science - Computer Science
Saarland University
04.2001 -
Bachelor of Science - Computer Science and Engineering
East West University
04.2001 -
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