Senior Backend Engineer

BlueThrone; Warszawa; Remote; PLN 253,000 - 338,000; Full time

Job summary

A dynamic tech company in Poland is seeking a Senior Backend Engineer who excels in Node.js and TypeScript. This fully remote role offers flexible hours and the chance to design impactful backend systems that power a rapidly growing product. Ideal candidates should have 5+ years of experience, strong skills in scalable architectures, and a passion for clarity in backend decision-making. Join a team that values autonomy and rapid impact.

Benefits

Fully remote work

Flexible hours

Unlimited time off

Qualifications

• 5+ years of experience building backend systems at scale.
• Strong skills in Node.js and TypeScript highly valued.
• Experience designing scalable architectures and RESTful APIs.

Responsibilities

• Architect and evolve backend systems supporting millions of active users.
• Build clean and reliable APIs for frontend teams.
• Detect and resolve performance bottlenecks before users notice.

Skills

Node.js

TypeScript

PostgreSQL

Elasticsearch

Redis

RabbitMQ

Job description

Senior Backend Engineer - Node.js, TypeScript

If you’re looking for a fully remote role with flexible hours, unlimited time off, and the chance to design products used by millions of people, this one’s for you 🎯

About BlueThrone

At BlueThrone, we don’t just build apps.

Wescale 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.

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.”

We're looking for someone who:
▸ takes initiative,
▸ thrives in fast-changing environments,
▸ isn’t afraid to zoom out to design complex systems or zoom in to perfect a single query.

You’ll designand scale the backend, make bold architectural calls, and build APIs that frontend engineers love to use. You’ll dive deep into data flows, caching, and performance -always thinking about how backend decisions shape the user experience.

You value clarity over complexity, impact over showmanship, and you care about how your work affects millions of real users.

What you'll do

• Architect and evolve backend systems that support millions of active users -from designing architecture to making sure everything runs smooth 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, always 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, constantly push limits, challenge assumptions, and raise the bar for backend engineering.

What you bring

• Solid experience building backend systems at scale (5+ years) - you’ve seen what works and what breaks when millions of people use a product.

• Strong Node.js + TypeScript skills -async code feels like second nature to you.

• Experience designing scalable architectures and RESTful APIs thatother engineers love to work with.

• Deep knowledge of PostgreSQLand Elasticsearch-comfortable with large datasets and optimizing for real-world use.

• Hands‑on knowledge of Redis and RabbitMQ- you know how to make systems both fast and resilient.

• Confidence around infrastructure- you can configure Nginx and aren’t afraid to get into deployment details.

• Extra points if you’ve touched Flutter or Kotlin, but 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 love experts, but we also value 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 actually matters.

The interview process 🪜

1. Initial call with the People team (30 minutes)
2. Technical interview with our Tech Lead (90 minutes)
3. Chat withthe 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 teams. 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.