Staff Software Engineer (Booking Integrations)

Breakneck Studio – an incubator and accelerator scaling digital and e-commerce brands at high velocity. It’s home to our Co-Found program, where ambitious founders take products from zero to market in months, not years. This is where you get hands-on, zero-to-scale experience you won’t find in a regular job.

We are looking

We are a fast-scaling travel startup with strong product-market fit, a generational traveltech company looking to disturb this sleepy industry. We are two-sided: travelers get a consumer product that helps them plan and book trips, and advisors get a SaaS-style subscription with certification and qualified leads in the offer.

This is not a role for someone who wants to manage agencies, coordinate stakeholders, or spend weeks building presentations. We’re looking for a builder – someone who can design a schema for breakfast, build a sandbox environment for lunch, load test it before dinner, and wake up excited to get it ready for prod the upcoming week.

• We’re looking for the first developers to join a fast-growing travel startup that’s already found strong product-market fit and is now ready to scale.
• You’ll work directly with the founder and early team, own growth from day one, and help shape what the product looks like as the company scales. Work-life balance can look different in a fast-moving company that’s on a mission to make a real impact.
• Jump to the application form and start your journey with us.
• Get ready to
• Design, build, and own integrations with third-party booking systems such as suppliers, booking platforms, and partner APIs, covering everything from modern REST/OAuth APIs to legacy SOAP services.
• Architect the webhook ingestion and worker queue infrastructure that keeps bookings, availability, and status updates flowing reliably at scale.
• Design database schemas in Supabase (PostgreSQL) that model complex booking data cleanly and hold up as volume grows.
• Build sandbox and testing environments so integrations can be developed, validated, and debugged safely before they reach production.
• Load test and harden services, finding bottlenecks and failure points before customers do.
• Take integrations from prototype to production: monitoring, alerting, retries, idempotency, and graceful handling of flaky third-party systems.
• Make sure credentials, tokens, and traveler data are handled securely across every integration.
• Help evolve our TypeScript, Supabase, and TanStack MVP into a scalable, production-grade platform, and make key architectural decisions along the way.
• Work directly with the founder and early team to decide which integrations matter most for travelers and advisors, and ship them fast.
• Set the engineering standards, patterns, and practices that future developers will build on as the team grows.

Expert-level understanding of API authentication across many integration styles, including: OAuth 2.0 (authorization code, client credentials, PKCE, refresh token rotation) and OIDC SOAP APIs, including WS-Security, XML signatures and certificate-based authentication REST API auth patterns such as API keys, HMAC request signing, JWT and mutual TLS

Location

• We have several great workspaces to choose from, including our headquarters in Vilnius and our hubs in Klaipėda and Riga.
• For our Vilnius office, we follow a 4 days onsite, 1 day remote hybrid model. For roles based outside Vilnius, the work arrangement -onsite, hybrid, or remote-depends on the specific position.

Own your wellnessStay sharp and well in your own way – health insurance (after probation), on-site physiotherapist, office gym, and fitness classes keep you moving. Plus 7 extra days off, 3 for weddings, hybrid work, and the freedom to work 2 months from anywhere in the world.

Boost your daily lifeEvery breakthrough needs a spark and our daily setup reflects that. Pet-friendly office, fresh breakfasts, hot lunches, drawers and fridges stocked with snacks and food – for a quick bite or even a team-cooked meal together. Rooftop and cellar events keep things lively, while 10 social clubs give space to dive into passions and try new things. Add a public transport card for Vilnius and Perks.lt perks for smoother days.

Drive global impactThis is where ambition scales. Build impact across 30+ brands worldwide. Launch bold projects. Even step in as a co-founder – we reward those who push further. And if you bring in more great people, you get €1500 for every successful referral.