Balazs Hetenyi
I build reliable, scalable, and user-centred software from data-driven cloud systems to intuitive user interfaces.
About Me
I'm a Senior Software Developer at the Wellcome Sanger Institute with over 4 years of experience building scalable, reliable software solutions. My work spans from data-driven cloud systems to intuitive user interfaces, always with a focus on creating user-centred technology.
My expertise includes AWS cloud architecture, Python development, full-stack web applications, and modern JavaScript frameworks. I'm passionate about mentoring developers and contributing to software engineering education, helping teams grow and deliver exceptional products.
When I'm not coding, you'll find me exploring new technologies, contributing to open-source projects, or sharing knowledge with the developer community. I believe in writing clean, maintainable code that solves real-world problems.
Technical Skills
Languages & Frameworks
Cloud & DevOps
Databases
Machine Learning
Other
Featured Projects
Community Notice Board App
FeaturedA React Native mobile application with real-time notifications and community engagement features. Built with modern mobile development practices and seamless user experience.
SmartLet Property Management Platform
FeaturedFull-stack web application for property management with automated workflows, tenant communication, and financial tracking. Streamlines property operations for landlords.
Hétenyi-Bau Construction Website
A fully responsive company website designed and developed for a local construction business, Hétenyi-Bau. The site presents the company's services, portfolio, and contact information in a modern, mobile-friendly layout. I built the entire site architecture, implemented SEO-optimised metadata, and ensured high Lighthouse performance scores. This project highlights my ability to deliver polished production-ready websites for real clients.
Transfer Learning Investigation
Machine learning research project investigating transfer learning techniques for image classification. Achieved 95% accuracy improvement over baseline models.
Professional Experience
Senior Software Developer
Wellcome Sanger Institute
- Leading frontend initiatives for large-scale research platforms using React + TypeScript, improving reliability and maintainability.
- Partnering with UX and product teams to design and deliver user-centric features.
- Introducing component reusability and performance optimisations that reduced load times by 30%.
- Mentoring junior developers and contributed to code reviews and knowledge sharing.
- Helping refine and extend the internal design system for consistent, accessible UIs.
Tech Stack:
React, TypeScript, Next.js, Python, Django, Docker, AWS, OpenStack, GitLab
Software Developer
Wellcome Sanger Institute
- Built and maintained complex web apps in React, focusing on clean code and long-term maintainability.
- Collaborated with product managers to iterate quickly on new feature concepts and experiments.
- Wrote comprehensive unit and integration tests, improving reliability across releases.
- Automated data processing pipelines, reducing manual intervention and boosting efficiency.
- Collaborated in Agile teams to deliver high-quality features on time.
Tech Stack:
React, TypeScript, Next.js, Python, Django, Docker, AWS, OpenStack, GitLab
Web/Software Development Mentor (Part-Time)
OpenClassrooms International
- Guiding students through building JavaScript, React, and Node.js applications, with a focus on modular design and best practices.
- Supporting projects involving frontend architecture, API integration, and cloud deployment.
- Highlighting the importance of scalability, testing, and agile collaboration.
Tech Stack:
HTML, CSS, JavaScript, TypeScript, React, Python, C#, REST API, Node.JS, SQL, MongoDB
Full-Stack Software Developer
Passle Ltd.
- Delivered customer-facing features in a commercial SaaS platform, collaborating closely with product and design teams.
- Worked across the stack with Angular, TypeScript, and .NET, building secure and reliable solutions.
- Gained early exposure to multi-team collaboration in a growing codebase.
Tech Stack:
Angular, TypeScript, C#, .NET MVC, MongoDB
Education
BSc (Honours) Computing & IT (Software Engineering)
The Open University
Comprehensive study of software engineering principles, algorithms, data structures, machine laerning (ML), and modern development practices.
Foundation Degree in Software Development
OpenClassrooms International
Intensive program covering full-stack development, project management, and industry best practices.
Get In Touch
Let's Work Together
I'm always open to interesting discussions, collaborations, or opportunities to build meaningful products. Whether you have a project in mind or just want to connect, I'd love to hear from you.