Overview Senior Backend Engineer - Node.js, TypeScript
At BlueThrone, we don’t just build apps. We scale indie mobile products into global powerhouses. With 80M+ downloads, 20M+ MAU, and $14M+ ARR - we’re rewriting the rules of mobile scaling. We’re a lean, high-performing team that thrives on speed, ownership, and building products people actually care about. If you’re excited by autonomy, global impact, and solving complex problems at scale, welcome aboard. But if you’re looking for structure, predictability, a 9-5 job, or hand-holding - this won’t be your vibe.
Note : fully remote role with flexible hours, unlimited time off.
What we’re looking for
You’ll be working on one of our flagship products : an analytics-driven music platform that changes how millions discover, interpret, and connect through music. Already loved by users worldwide, the product is entering a new stage of rapid growth.
As Senior Backend Engineer, you’ll own the systems that power this growth. This isn’t a maintenance role. We’re not looking for someone to “keep APIs alive.”
Architect and evolve backend systems that support millions of active users—from designing architecture to ensuring smooth operation at scale.
Build APIs engineers love—clean, reliable, and intuitive, so the frontend team can move fast without friction.
Work with complex data flows, caching, and messaging, balancing performance with simplicity.
Detect and resolve performance bottlenecks before users notice.
Collaborate closely with product, frontend, and data teams to ship fast and iterate faster.
Bring fresh ideas, push limits, challenge assumptions, and raise the bar for backend engineering.
What you bring
Solid experience building backend systems at scale (5+ years).
Strong Node.js + TypeScript skills—async code comes naturally to you.
Experience designing scalable architectures and RESTful APIs that other engineers love to work with.
Deep knowledge of PostgreSQL and Elasticsearch—comfortable with large datasets and optimizing for real-world use.
Hands-on knowledge of Redis and RabbitMQ—fast and resilient systems.
Confidence with infrastructure—able to configure Nginx and dive into deployment details.
Extra points if you’ve touched Flutter or Kotlin; curiosity and adaptability matter more than a checklist.
Most importantly : you thrive in fast-changing environments where “done” beats “perfect,” and impact always comes first.
You’ll fit right in if you
Prefer freedom over fixed schedules—remote, flexible, unlimited time off.
Are naturally curious and love driving real impact for users and the business.
Can wear multiple hats—we value experts, but also jacks of all trades.
Keep things cool, calm, and collected—save the drama for your llama.
Like challenges and aren’t afraid to roll up your sleeves to win.
Believe in working smarter, not harder—focus on productivity and results, not punching the clock.
Follow your passion and have fun while doing work that matters.
The interview process
Initial call with the People team (30 minutes)
Technical interview with our Tech Lead (90 minutes)
Chat with the CTO and VP of Product (60 minutes)
We move fast and respect your time. Most candidates finish the process in under 4 weeks.
Equal opportunities for everyone
We believe the best teams are diverse. We welcome applicants from all backgrounds and experiences. We consider all candidates regardless of age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, veteran status, neurodiversity, or disability. If you need reasonable adjustments at any point in the application or interview process, please let us know.
Seniority level
Not Applicable
Employment type
Full-time
Job function
Engineering and Information Technology
Industries : Technology, Information and Internet
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Senior Backend Engineer • Barcelona, Catalonia, SPAIN