x5 Backend Engineers (Junior-Senior) | Python, NodeJS, API frameworks | Start-up, High-Performance Sports Trading & Data Platform | Lisbon Hybrid | €40,000 - €80,000 base + equity

We’re partnering with a profitable, fast-growing sports trading and data technology start-up building the core infrastructure behind modern sports and esports markets.

Their platform powers real-time odds, liquidity, execution, and aggregation systems used by professional trading firms, sportsbooks, and data providers.

Think high-performance backend systems, real-time data pipelines, and latency-sensitive distributed architectures.

They’re scaling multiple backend teams in Lisbon and hiring junior, mid-level, and senior engineers across several product areas:

• Market Making & Trading Integrations
• Sportsbook Aggregation Platform
• Odds Feeds & Data APIs

The Role - x5 Backend Engineers (Junior-Senior) | Python, NodeJS, API frameworks | Start-up, High-Performance Sports Trading & Data Platform | Lisbon Hybrid | €40,000 - €80,000 base + equity

You’ll join a small, senior-leaning engineering group building backend systems that must be fast, resilient, and always-on.

Depending on your experience, you may work on:

• Building and scaling backend services and APIs
• Designing real-time data pipelines and integrations
• Working with high-volume event processing and relational databases
• Improving latency, reliability, and system performance
• Owning features end-to-end in a high-trust environment

This is a hands-on engineering role with real product ownership and direct impact.

Tech Environment - x5 Backend Engineers (Junior-Senior) | Python, NodeJS, API frameworks | Start-up, High-Performance Sports Trading & Data Platform | Lisbon Hybrid | €40,000 - €80,000 base + equity

You don’t need experience with everything, but strong experience with some of the following is expected and also a hungry desire to learn new technologies:

• Python
• Node.js
• TypeScript
• SQL / PostgreSQL
• API frameworks
• React (for odds feeds team)
• Rust (big plus for aggregation platform)
• Git, Docker, and modern development workflows

Teams focus heavily on distributed systems, performance optimisation, and real-time processing.

What They’re Looking For - x5 Backend Engineers (Junior-Senior) | Python, NodeJS, API frameworks | Start-up, High-Performance Sports Trading & Data Platform | Lisbon Hybrid | €40,000 - €80,000 base + equity

• Junior → Senior backend engineers (0–7+ years)
• Strong fundamentals in backend engineering and system design
• Comfortable working with databases and APIs
• Curious, pragmatic, and ownership-driven mindset
• Able to work autonomously in a fast-moving environment

Big Plus (not required):

• Experience with trading, market making, betting, or low-latency systems
• Cloud or infrastructure experience
• Sports or finance domain exposure

Why Join - x5 Backend Engineers (Junior-Senior) | Python, NodeJS, API frameworks | Start-up, High-Performance Sports Trading & Data Platform | Lisbon Hybrid | €40,000 - €80,000 base + equity

• Profitable and growing quickly
• Small, ambitious engineering team (11 engineers in total)
• Real technical ownership and influence
• Backed by a leading hedge fund in the sports data space
• Clear product vision and long-term roadmap
• Lisbon hybrid with flexibility

If you’re a backend engineer who enjoys solving complex, real-time, performance-critical problems and wants to work on infrastructure with real users and real stakes, this is a strong opportunity to explore.

Apply with your CV and we’ll be in touch if it looks like a good fit.