Hamzeen is available for hire
Hire HamzeenHamzeen Hameem
Verified Expert in Engineering
Java Developer
Rotterdam, Netherlands
Toptal member since August 13, 2026
Bio
Across healthcare, fintech, banking, and space-tech, Hamzeen has spent over 16 years building end-to-end products as a full-stack developer. His toolkit centers on Angular, Node.js, and Spring Boot. While at Alphatron Medical Innovation BV, he established a CI/CD pipeline on Azure DevOps that cut release cycle time by 40%.
Portfolio
MultiSynapTech
Node.js, Bun, TypeScript, CSS, HTML, Tailwind CSS, Software Engineering...
Alphatron Medical Innovation BV
Angular, Electron, TypeScript, Spring Boot, Apache Tomcat, CSS, HTML...
Netcompany
Angular, Node.js, CSS, HTML, Software Engineering, JavaScript, Docker...
Experience
- Java - 14 years
- Node.js - 10 years
- Angular - 10 years
- TypeScript - 9 years
- SCSS - 8 years
- Tailwind CSS - 5 years
- Spring Boot - 5 years
- React - 5 years
Preferred Environment
Azure DevOps, AWS Lambda, Docker, Terraform, Jasmine, CodeceptJS, Newman, Angular, Java
The most amazing...
...open-source project I've published is an official Google Chrome Experiment featured on chromeexperiments.com.
Work Experience
Senior Developer
2025 - 2026
MultiSynapTech
- Built an Electronic Patient Record (EPR) system for private dental care practices, serving a team of five.
- Engineered OIDC authentication flow using Microsoft Entra ID as the identity provider.
- Created the company's design-system library and reusable component suite using the Vue 3 Composition API.
Technologies: Node.js, Bun, TypeScript, CSS, HTML, Tailwind CSS, Software Engineering, JavaScript, Docker, SOLID Principles, Claude, Git, DevOps, Architecture, HTML5, Web Development, Algorithms, User Interface (UI), Responsive Web Design (RWD)
Lead Developer
2022 - 2025
Alphatron Medical Innovation BV
- Led end-to-end development of two critical healthcare products: a patient vital-signs kiosk and a Computer-on-Wheels (COW) system used by nurses during ward rounds.
- Architected and built kiosk software in Angular 17 and Electron from the ground up, leading a team of four.
- Upgraded Spring Boot back end to event-driven architecture (push) instead of polling (pull); integrated USB devices via usb4java and JNI.
- Established a full CI/CD pipeline on Azure DevOps, cutting release cycle time by approximately 40%.
Technologies: Angular, Electron, TypeScript, Spring Boot, Apache Tomcat, CSS, HTML, Tailwind CSS, Software Engineering, JavaScript, SOLID Principles, Claude, Grafana, Git, DevOps, Technical Leadership, Full-stack, Architecture, Design Patterns, Keycloak, HTML5, Web Development, Algorithms, User Interface (UI), Responsive Web Design (RWD)
Senior Consultant/Lead Developer
2022 - 2022
Netcompany
- Led development of a Dutch Ministry project in Angular and Node.js (classified domain).
- Contributed to Rijkshuisstijl—the official Dutch Government design system—Angular component library.
- Implemented the first pilot version of the app and got it tested in Africa.
Technologies: Angular, Node.js, CSS, HTML, Software Engineering, JavaScript, Docker, SOLID Principles, Git, DevOps, Infrastructure as Code (IaC), Technical Leadership, Architecture, Next.js, HTML5, Web Development, Algorithms, User Interface (UI), Responsive Web Design (RWD)
Front-end Developer
2021 - 2021
LeanSpace
- Built a mission-critical single-page application for a French space startup using React (UMI.js).
- Contributed to the design system by building new components.
- Implemented unit tests using Jest in integration-style testing.
Technologies: Node.js, React, Highcharts, CSS, HTML, Tailwind CSS, Software Engineering, JavaScript, Jest, Git, Design Patterns, Next.js, HTML5, Web Development, User Interface (UI), Responsive Web Design (RWD)
Senior Software Engineer/Tech Lead
2017 - 2021
HCL Technologies BV (client: Aegon)
- Worked as full-stack developer on two high-traffic, client-facing insurance applications in Angular 2+ for Aegon NL.
- Integrated AWS Lambda, APIGEE gateway, and multiple third-party REST backends.
- Set up offshore Colombo team (Jan–Jul 2021), providing technical leadership and onboarding.
- Owned front-end automation suite: CodeceptJS (E2E) and Newman (Postman API tests).
Technologies: TypeScript, Node.js, AWS Lambda, Apigee, SCSS, CSS, HTML, Tailwind CSS, Software Engineering, JavaScript, Git, DevOps, Amazon CloudWatch, Technical Leadership, Full-stack, Architecture, Design Patterns, HTML5, Web Development, Algorithms, Responsive Web Design (RWD)
Software Consultant
2016 - 2017
(clients: Standard Chartered & DBS Bank) Verinon
- (Standard Chartered) Worked as a UI developer on the Global Pricing and Billing System—built application-wide search and file upload with Ember.js.
- (Standard Chartered) Defined RESTful API contracts with back-end teams.
- (DBS Bank) Created a shared Angular 2/TypeScript component library (NPM module) for uniform UI across the entire bank's credit architecture.
- (DBS Bank) Set up Jasmine and Protractor BDD/E2E testing.
- (Standard Chartered) Contributed from PoC to production for a retail banking iPad app in Cordova and Angular 2, including post-launch support.
Technologies: Cordova, CSS, HTML, Software Engineering, JavaScript, Git, Full-stack, Web Development, Responsive Web Design (RWD)
Senior Software Engineer
2015 - 2016
Virtusa
- Provided post-release support and defect resolution for the O2/Telefónica Lavastrom Spend Analyzer (Ember.js, full-stack).
- Tracked and fixed Jira issues in the post-production period.
- Improved load and scalability of the software. Worked on Performance, rate limiting, and caching in the back end.
Technologies: Ember.js, CSS, HTML, Software Engineering, JavaScript, Git, Algorithms
Research Assistant
2013 - 2015
Singapore University of Technology & Design (SUTD)
- Constructed a DSI-based multi-touch table and designed a stroke rehabilitation game (MDA-funded research project).
- Co-authored a peer-reviewed publication on real-time singing pitch training UI design (ICMC|SMC 2014, Athens).
- Implemented a real-time image processing algorithm to detect fingertips.
Technologies: Java, Software Engineering, Algorithms
Software Engineer
2011 - 2013
Cambio HealthCare Systems
- Developed care documentation and digital dictation modules for a medical records system (Olympus/Philips devices).
- Implemented compliance changes to meet Sweden's Patient Data Law (PDL); practiced agile and design patterns extensively.
- Followed standards like FHIR for interoperability/data exchange with external systems.
Technologies: Java, Jakarta EE (Java EE or J2EE), Spring Boot, Git, Design Patterns, Algorithms
Experience
iBanking app for Aegon
https://www.aegon.co.uk/A secure retail internet banking platform that enables customers to manage accounts, view balances and transaction history, transfer funds, manage beneficiaries, and make payments through responsive web and mobile channels.
Education
2006 - 2010
Bachelor's Degree in Software Engineering
University of Westminster - London, UK
Skills
Libraries/APIs
Node.js, React, REST APIs, Highcharts, Apigee, Newman, React Testing Library
Tools
Git, Keycloak, Claude, Amazon CloudWatch, Apache Tomcat, Terraform, Apache Maven, Vitest, Mocha, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Grafana
Languages
TypeScript, Java, JavaScript, CSS, HTML, HTML5, SCSS
Frameworks
Angular, Tailwind CSS, Spring Boot, Next.js, Electron, Ember.js, Jasmine, Protractor, CodeceptJS, Jest
Paradigms
Responsive Web Design (RWD), Design Patterns, DevOps, Azure DevOps
Platforms
Docker, AWS Lambda, Jakarta EE (Java EE or J2EE)
Storage
MSSQLCE, MySQL, SQLite, MongoDB, PostgreSQL
Other
CI/CD Pipelines, SOLID Principles, Software Engineering, Full-stack, Web Development, User Interface (UI), OpenID Connect (OIDC), Infrastructure as Code (IaC), Technical Leadership, Architecture, Content Management Systems (CMS), Algorithms, Bun, Cordova, TanStack Query, Terraform (IaC)
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