Senior Fullstack Engineer (Java/Kotlin + React)
New
B
B3 Consulting PolandSoftware Development
Warszawa, Al. Jerozolimskie 44, Warszawa, Country code: PLFull-TimeSenior
Salary not disclosed
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Job Details
- Languages
- English at min. B2+ level
- Required Skills
- Artificial IntelligenceJavaJavascriptKotlinTypeScriptReactRESTful APIs
Requirements
- Deep, hands-on experience in Java and/or Kotlin.
- Experience designing, building, and scaling RESTful APIs with an API-first approach (OpenAPI/Swagger).
- Good frontend skills in JavaScript/TypeScript and a modern framework (React preferred).
- Solid understanding of distributed systems and integration patterns.
- Knowledge of secure authentication protocols (OAuth 2.0, OpenID Connect).
- Experience in technical leadership, including defining coding standards and leading technical discussions.
- Ability to translate product requirements into feasible solutions within a complex technical environment.
- Advanced use of AI in engineering work beyond code autocompletion.
- Problem-solver mindset and flexibility in greenfield projects.
- English at min. B2+ level.
Responsibilities
- Design flexible API contracts (API-first) for external B2B partners.
- Write developer documentation and create mock environments.
- Support the onboarding of partners integrating with the platform.
- Develop new services in a greenfield environment, integrating with platform services.
- Build web interfaces including checkout paths, landing pages, and discovery hubs.
- Integrate frontend with backend and mobile applications using agentic development tools.
- Act as the technical leader and architectural anchor for integrations.
- Define coding standards and lead technical discussions.
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