Senior Software Engineer – Full‑Stack SDK

About the role

We are seeking a full‑stack SDK engineer to build the layer where our data reaches partners' products. The role involves developing SDK modules, embeddable widgets, integrating APIs, and working daily with AI coding agents.

Key responsibilities

• Extend the SDK with new modules, integrations, and TypeScript definitions while ensuring quality and test coverage.
• Build embeddable, responsive, themeable and accessible widgets that render correctly on any partner page.
• Integrate internal services and partner APIs (REST, WebSocket, SSE) with robust retry, reconnection, caching and graceful degradation.
• Ship daily using AI coding agents, creating context files, reusable skills and maintaining fast feedback loops.
• Maintain developer documentation, runnable examples and clear error messages for partner developers.

Required profile

• 3+ years of production JavaScript/TypeScript development.
• Daily experience with AI coding agents and ability to structure projects for optimal agent performance.
• Proven ability to consume HTTP and real‑time APIs, handling browser‑side auth, CORS and failure modes.
• Solid front‑end fundamentals (CSS, layout) to build moderately complex widgets from mocks.
• Clear written communication for a developer audience and habit of asking early to avoid building the wrong thing.

Required skills

• JavaScript
• TypeScript
• Vite, Rollup, esbuild bundlers
• REST, WebSocket, Server‑Sent Events APIs
• AI coding agents
• CSS and responsive layout
• Testing with Vitest and Playwright
• CI/CD pipelines
• AWS services

What we offer

• Collaborative global environment with offices in Europe, Asia and the US.
• Flexible working hours and autonomy while operating an office‑first model.
• Inclusive community groups such as Women in Tech and Pride.
• Employee assistance programme and well‑being apps (Calm, Reulay).
• Online training resources and career development opportunities.