Full-stack Developer

József Fényes

I build practical backend systems, APIs, and web applications with .NET, C#, SQL, Angular, React, and Next.js.

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Projects

Selected work themes

A focused view of the systems József has worked on professionally.

Enterprise SSO Platform

authentication platform with OAuth 2.0 flows, role-claim authorization, app onboarding APIs, and EF Core persistence improvements.

.NETIdentityServer4EF CoreSQL
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Wallet Platform

Production work around wallet payments, balance operations, statements, and API troubleshooting in a high-availability financial environment.

C#ASP.NETSQLAPIs
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Developer Security Platform

Internal training tools with React components, CloudFormation-backed challenge environments, and automated security reporting on AWS Lambda.

ReactAWSTypeScriptLambda
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Experience

Production software work

Backend-heavy delivery across payments, authentication, internal platforms, and operational tooling.

Software Engineer

Barion

Aug 2025 - Present
11 mos

Budapest, Hungary - Hybrid

  • Maintains .NET services for wallet payments, balance operations, customer statements, and partner-facing API workflows.
  • Investigates production issues with log correlation, database analysis, and clear mitigation steps.

Software Engineer

3DHISTECH - The Digital Pathology Company

Aug 2023 - May 2025
1 yr 9 mos

Budapest, Hungary - Hybrid

  • Designed and delivered an SSO rollout across 9+ internal applications.
  • Built authorization, onboarding, and EF Core data-layer improvements for enterprise application teams.

Software Engineer Intern

GoTo

Sep 2022 - Aug 2023
11 mos

Budapest, Hungary - Hybrid

  • Built React UI and AWS CloudFormation integrations for internal security training infrastructure.
  • Owned a recurring Falcon-based security reporting workflow delivered through AWS Lambda.

Software Engineer Intern

Armin Trade Kft

Sep 2021 - Sep 2022
1 yr

Remote

  • Developed a WinForms inventory application and maintained custom data-access logic for operations teams.

Hobbies

Creative work outside code

Side interests that keep visual thinking, sound design, and interactive systems close to the surface.

3D modelling

Creating hard-surface and environment assets, with an eye for form, materials, and iteration.

Music making

Composing and producing small tracks as a creative counterweight to engineering work.

Indie gamedev

Exploring gameplay systems, interactive prototypes, and the craft of shipping small experiences.