Senior Frontend Engineer – API/Interface Design

42dot

Senior Frontend Engineer shaping user-facing layer for Software Defined Vehicles at 42dot. Involved in API design, production frontend implementation, and real-time dashboards.

Posted 7/6/2026full-timeWarsaw • 🇵🇱 PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and evolving REST APIs and OpenAPI specifications, with a strong focus on frontend development using React and TypeScript. Capable of integrating 3D assets and ensuring the resilience of streaming UI components while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

React DevelopmentTypeScript ProficiencyOpenAPI 3.x DesignThree.js IntegrationREST and Streaming Protocols

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Applicant Tracking System Keywords

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Hard Skills

ReactTypeScriptOpenAPI 3.xThree.jsServer-Sent EventsWebSocketZodJSON SchemaRuntime ValidationProduction Experience

Soft Skills

CollaborationCode ReviewTechnical Communication

Tools & Technologies

GlTFReact-three-fiberMocksClient GeneratorsValidators

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

API DesignStreaming UI ComponentsDeveloper ExperienceVehicle Platform

Tech Stack

Tools & technologies

JavaScriptReactTypeScript

About the role

Key responsibilities & impact

Design, document and evolve the public REST and Server-Sent Events API surface of our virtual vehicle platform, including OpenAPI specifications and generated partner clients.
Implement and maintain the production frontend in React and TypeScript: real-time vehicle state dashboards, vehicle variant management, partner-facing portals, configuration and scenario tooling.
Integrate 3D vehicle assets (glTF) into the frontend using three.js or react-three-fiber, in close collaboration with our product designer.
Build the developer experience around the schema: typed clients, runtime validation, mocks, contract tests, generated documentation.
Own resilience of streaming UI components: reconnection, backpressure, multiplexed event handling.
Participate directly in technical conversations with external integration partners, including API design reviews and partner-facing written guides.

Requirements

What you’ll need

Bachelor's degree in Computer Science or related field, equivalent practical experience.
5+ years of production experience with React and TypeScript, including end-to-end type safety.
Hands-on experience designing and evolving OpenAPI 3.x specifications and the tooling around them (validators, mocks, client generators).
Strong schema-first instincts (Zod, JSON Schema, runtime validation at boundaries).
Solid working understanding of REST and streaming protocols (Server-Sent Events, WebSocket).
Practical experience integrating 3D content in the browser with three.js or react-three-fiber: scenes, cameras, glTF loading, basic performance tuning.
Strong code review culture and ability to collaborate with backend and design counterparts.
Fluent English.

Benefits

Comp & perks

Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees, regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, or veteran status.