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Your Mission

As a Senior Backend Engineer, you bring a pragmatic mindset, write clean and scalable code, and thrive in a modern agile product environment. You’ll play a key role in shaping our architecture, leading backend initiatives, and collaborating closely with cross-functional stakeholders.

This role offers a clear path toward technical leadership — we're looking for someone eager to take ownership and grow into a Tech Lead position over time.

• Architect & Build: Design, implement, and maintain scalable microservices on a modern tech stack (NestJS, Node.js, event-based architecture, serverless infrastructure).
• Shape the Foundation: Define system architecture and lay down foundational engineering practices for maintainability and scale.
• Collaborate & Guide: Contribute to technical strategy and product direction. Participate actively in roadmap discussions and offer a long-term engineering perspective.
• Write Great Code: Focus on clean, modular, and maintainable code. Drive TDD and ensure quality with unit, integration, and system tests.
• Own Delivery: Work iteratively, embrace fast feedback cycles, and help ensure features move smoothly from concept to production.
• Evaluate & Innovate: Stay up to date with emerging tools and frameworks, and bring new ideas to the table.

Your Profile

Technical Leadership

• 7+ years of professional software development experience, with at least 3 years using Node.js.
• Strong experience with JavaScript/TypeScript; familiarity with NestJS (or similar frameworks) is a plus.
• Deep understanding of asynchronous programming, distributed systems, and microservice architecture.
• Experience working with event-driven or serverless systems.
• [Bonus] Exposure to frontend technologies like Svelte.
• [Bonus] Experience with CI/CD pipelines, monitoring tools, or infrastructure-as-code.

Engineering Philosophy

• Passionate about writing clean, modular, and testable code.
• Experienced with test-driven development and quality-focused delivery practices.
• Comfortable making architectural decisions and guiding others in trade-offs and best practices.

Growth & Ownership

• Interested in evolving into a Tech Lead role over time — driving architecture, mentoring peers, and helping shape engineering standards.

Soft Skills

• Excellent communication skills in English, both written and spoken.
• Collaborative mindset and willingness to take initiative.
• Curious and proactive — you enjoy staying current with web engineering trends and tools.

Please note that we are seeking support for our Berlin office.

What You Can Expect from Us

• Work on impactful systems that solve real-world problems.
• Be part of a high-ownership culture where your voice and decisions matter.
• Enjoy a modern tech stack, agile processes, and flexible hybrid work from Barcelona or Berlin.
• Grow into a technical leadership role with autonomy and support.

Interested? Then we’re excited to hear from you!

We believe diverse perspectives make us better – that’s why we strive to build an inclusive, discrimination-free work environment. We welcome individuals from all backgrounds – regardless of ethnicity, skin color, religion, nationality, gender, age, or physical or mental abilities. Discrimination has no place at Mercanis.