Senior Software Engineer na Sinch

Role Overview

We’re looking for a pragmatic Full-Stack Engineer with 3–5 years of hands-on experience building scalable web applications across the MERN/Node ecosystem and JVM services. You’ll own features end-to-end—design, build, test, deploy, and iterate—while collaborating closely with product, design, and QA.

What You’ll Do

• Design and develop RESTful/JSON APIs in Node.js/Express and/or services in Java (Spring or similar).
• Build responsive, accessible UIs with React (hooks, context/state management, routing).
• Model data and write performant queries on MongoDB; design indexes and review query plans.
• Write unit/integration tests; participate in code reviews and CI/CD workflows.
• Instrument services for logs/metrics/tracing; troubleshoot performance and production issues.
• Collaborate with PM/Design; communicate trade-offs clearly and ship iteratively.
• Follow secure coding practices and ensure high code quality, reliability, and maintainability.

Must-Have Qualifications

• 3–5 years professional experience as a full-stack or backend engineer.
• Strong in Java (OOP, collections, concurrency basics) and/or Node.js/Express.
• Proficiency with React and modern JavaScript/TypeScript (ES6+).
• Solid experience with MongoDB (schema design, aggregation, indexing).
• Comfortable with Git, REST, JSON, async programming, and debugging across the stack.
• Clear, concise communication skills—written and verbal—with a product mindset.

Good to Have (Nice-to-Haves)

• Redis for caching/rate-limiting/sessions.
• Kafka (or any event streaming) for async, decoupled architectures.
• Docker, basic CI/CD (GitHub Actions/GitLab), cloud exposure (AWS/GCP/Azure).
• Testing libraries (Jest, React Testing Library, Mocha/Chai) and API testing (Postman).
• Basic security practices (OWASP), API auth (JWT/OAuth2), and performance profiling