Open to opportunities

Balaban Sergiu

@balabansergiu

Message

I build scalable PHP backend systems, faster APIs, and reliable cloud infrastructure.

Romania

Message

What I'm looking for

I'm looking to build high-performance, maintainable backend systems, shape technical architecture, improve delivery processes, and partner closely with teams and clients on complex business requirements.

I've built scalable backend systems for Tapptitude and Axitech, including an intelligent collision management platform powered by Laravel, MySQL, and AWS. I delivered media management, audit logging, collaborator permissions, alerting, automated documentation, and machine-to-machine integrations.

I improved API response times by 5 to 10x through better eager loading, data-access restructuring, and queued jobs. I've also built real-time collaboration with Pusher and production-grade automated testing with approximately 70% code coverage.

Across Laravel, Symfony, Node.js, AWS, and cloud deployment pipelines, I partner with clients to scope requirements, estimate delivery, and align architecture with business goals.

Experience

Work history, roles, and key accomplishments

Senior Backend Developer

Tapptitude & Axitech

Aug 2021 - Dec 2025 (4 years 4 months)

Architected and engineered backend systems for an intelligent collision management platform using Laravel, MySQL, and AWS. Optimized scalability and performance, achieving 5 to 10x faster API response times and approximately 70% code coverage.

PHP Laravel MySQL AWS S3 Uppy Laravel Scribe N8n Pusher Pest Unit Testing Feature Testing API Design

Full-Stack Developer

Tapptitude

Feb 2019 - Aug 2021 (2 years 6 months)

Developed scalable backend and API services using Laravel, Symfony, Node.js, MySQL, and MongoDB for diverse startup ventures. Managed cloud infrastructure and deployment pipelines with AWS, Heroku, and Forge.

Laravel Symfony Node MySQL MongoDB AWS Heroku Forge API Development Event Driven Architecture

Backend Developer

Greppy Systems

Oct 2017 - Feb 2019 (1 year 4 months)

Engineered backend solutions and APIs using Symfony 2 to 4, Shopware, and CodeIgniter. Transformed PSD mockups into responsive interfaces and established automated testing protocols.

Symfony Shopware CodeIgniter PHP HTML CSS JavaScript Unit Testing Agile Code Review

Web Developer

Freelancer

Jun 2014 - Sep 2017 (3 years 3 months)

Produced custom websites and PHP applications using CodeIgniter and WordPress. Integrated third-party APIs and created bespoke administrative dashboards for client management.

CodeIgniter WordPress PHP API Integration Dashboard Development Web Development

Intern Web Developer

Fakultät für Automatisierung und Informatik, Cluj-Napoca

Jul 2015 - Aug 2015 (1 month)

Acquired proficiency in Python development and applied RESTful API architectural principles. Leveraged Google Maps API to prototype a desktop application with an integrated GUI.

Python REST APIs Google Maps APIs desktop application development