Bálint K.

QuartzDevs is a remote-first software consultancy delivering custom web platforms and digital products for international clients, with a strong focus on modern frontend architectures and scalable cloud deployments.

• Led the frontend-heavy development of a B2B e-commerce platform, delivering complex business workflows, pricing logic, and account-based features.
• Built and maintained applications ranging from marketing landing pages to AI-integrated web platforms, ensuring consistent quality and performance across projects.
• Designed modern frontend architectures using Next.js and Remix, focusing on SSR, routing strategies, and performance optimization.
• Implemented GraphQL-based data layers and collaborated closely with backend services to ensure efficient, type-safe data exchange.
• Deployed and operated applications using Vercel and AWS, contributing to cloud configuration and production readiness.
• Worked directly with clients to translate business requirements into robust technical solutions, maintaining high delivery standards.

GoStudent is a leading European EdTech company providing online tutoring platforms at scale, serving students, tutors, and parents across multiple countries.

• Served in a dual role as Senior Frontend Engineer and Product Engineering Lead, balancing hands-on development with team leadership.
• Led a cross-functional frontend team of five engineers, conducting regular 1:1s, providing performance feedback, and mentoring team members.
• Drove the development of new product features while continuously improving UX, performance, and frontend reliability.
• Maintained direct coding ownership, contributing to complex frontend logic and backend integrations.
• Helped establish frontend best practices, coding standards, and delivery processes within the team.

BV Technologies (BetVictor) operates large-scale online sports betting platforms that handle high traffic volumes and support real-time user interactions.

• Contributed to a high-traffic online betting platform, working across both frontend and backend layers.
• Developed new user-facing features in React while maintaining and extending existing functionality.
• Worked with Ruby on Rails backend services, integrating REST APIs and real-time communication via WebSockets.
• Ensured application reliability through automated testing with Jest and RSpec.
• Collaborated with distributed teams to deliver features under strict performance and reliability requirements.

Cogito Technologies develops digital learning platforms for higher education, focusing on collaboration and scalable cloud-native architectures.

• Built a community-based learning management platform for university students.
• Took ownership of backend development, including API design, data modeling, and system operation.
• Worked extensively with GraphQL and WebSockets to support real-time collaboration features.
• Contributed to DevOps workflows, including Dockerized services, CI/CD pipelines, and cloud deployments on GCP.
• Supported frontend development using React and Gatsby to ensure seamless end-to-end delivery.

Silio is a digital agency that delivers custom web applications and digital solutions to clients across multiple industries.

• Developed full-stack web applications using Ruby on Rails.

• Implemented business logic, data models, and server-rendered views.

• Wrote automated tests using RSpec to ensure application reliability.

• Collaborated closely with designers and project managers to deliver features on tight timelines.

Innobile Informatikai Kft. develops internal administration systems and business software for enterprise clients.

• Developed and maintained administrative and back-office systems.

• Designed efficient database schemas and implemented RESTful endpoints.

• Built backend services using Laravel, focusing on performance and maintainability.

• Worked with Docker and Jenkins to support deployment and CI workflows.

• Gained early experience in full lifecycle software development, from requirements to production.