Skip to content
Tamás Sallai

Tamás Sallai

Full-stack developer based in Budapest.

I have three years of professional development experience, working mainly with TypeScript, React, Node.js, and NestJS. My work has covered frontend, backend, browser extensions, infrastructure, architecture, and quality.

Before development, I worked in software testing and technical support. Together, those roles give me more than five years of professional IT experience and still shape how I think about failure cases, maintainability, and the people using and supporting a product.

Contact meDownload CVView experience
Tamás Sallai
Based in Budapest, Hungary
Primary focusTypeScript · React · Node.js

Experience

The work that has shaped how I approach software development.

Oct 2025 — Sep 2026

Bannerse

Full-stack developer

Took end-to-end responsibility for a full-stack application, working across frontend, backend, data, infrastructure, and product quality while contributing to its technical direction.

  • Designed across frontend, backend, authentication, data, infrastructure, moderation, and analytics concerns.
  • Built organization membership and application roles around Supabase authentication, with PostgreSQL and Edge Functions.
  • Worked with Cloudflare hosting, domains, redirects and R2, plus Gemini-based text and image moderation.
  • Introduced structured documentation and reusable agent workflows to keep application knowledge and engineering rules maintainable.

Feb 2025 — early 2026

Independent

Freelance Web Developer

Built and maintained responsive client websites, delivered new features, and handled practical performance and maintenance work.

Sep 2023 — Oct 2025

Dolphio Technologies

Full-stack developer

Substantially owned the technical implementation of a research-and-development product spanning a backend, frontend, and browser extension.

  • Built a NestJS backend, React frontend, and TypeScript/Webpack browser extension.
  • Contributed to system design, architectural decisions, and technology selection.
  • Maintained and improved legacy systems, including API performance work with response times reported as improving by up to five times.

Apr 2020 — Jun 2022

I-Cell Mobilsoft

Software Tester & Technical Support

Tested web applications, supported customers integrating APIs, investigated technical problems with developers, and helped new colleagues get started.

Technologies and skills

Concrete technologies and practices from my professional work.

Core development

TypeScript · JavaScript · React · Node.js · Tailwind · Claude · Codex

Frameworks and tooling

Vite · Next.js · TanStack · NestJS · PHP · Laravel

Data and infrastructure

PostgreSQL · Cloudflare Workers · Cloudflare R2 · Supabase · PostHog

Architecture and quality

Test Driven Development · System design · Technical documentation · Performance optimization

AI-assisted engineering

Codex · Claude Code · Google AI Studio · Agent workflow design · Compound engineering

Working with me

I value ownership, shared understanding, and teams where people can learn from one another.

Independent, but collaborative
I am comfortable taking ownership and working through problems independently, but I prefer to share context and involve others in important decisions.
I enjoy sharing knowledge
I like explaining how things work, answering questions, and working through problems together. Helping someone understand something is genuinely satisfying to me.
Open to feedback and learning
I welcome constructive criticism and appreciate when colleagues challenge my thinking or teach me a better approach.

Contact

If you’d like to work with me or think I could be a good addition to your team, I’d be happy to hear from you.

Send a message