Senior Fullstack Engineer (Java&Kotlin + JavaScript)
$240,000–$324,000 year
Remote
Job Summary
Design robust API contracts, write developer documentation, and create mock environments to facilitate seamless onboarding of external partners. Drive development of modern web interfaces including checkout paths, landing pages, and discovery hubs that consume integrated partner services. Bridge Java backend design with modern frontend development to ensure cohesive, end-to-end technical implementation for this e-commerce platform serving millions of users. Lead technical discussions, define coding standards, and architect flexible API contracts for external B2B partners. Requires deep hands-on experience in Java and Kotlin, strong RESTful API skills, and proficiency in JavaScript/TypeScript with React. Availability for incident response is required.
Required Qualifications
- Deep, hands-on experience in Java (and Kotlin)
- Strong track record in designing, building, and scaling RESTful APIs (API-first design, OpenAPI/Swagger)
- Excellent frontend skills: proficiency in modern JavaScript/TypeScript and a modern framework
- Solid understanding of distributed systems, integration patterns, and secure authentication (OAuth 2.0, OpenID Connect)
- Proven ability to define coding standards, lead technical discussions, and design flexible 'API contracts' for external B2B partners
- English level min. B2+
- Availability for the Incident Response service
Desired Qualifications
- React is highly preferred
- Experience dealing with data isolation and security standards
- Eagerness to explore and implement Agentic AI tools (e.g., Copilot, LangGraph) to accelerate engineering workflows
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