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 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.

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.

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.

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.

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Jump to the application form and start your journey with us.

• 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.

• Strong software engineering fundamentals, with deep experience in Authentication & Identity and Backend Software Engineering (PostgreSQL, PHP/Laravel, Node.js/TypeScript).
• 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
• Proven experience designing secure, scalable webhook systems: signature verification, idempotency, replay protection, deduplication, ordering, rate limiting and dead-letter handling.
• Hands-on experience building asynchronous job processing with AWS SQS workers, Temporal workflows, or an equivalent durable execution or queue system, including retries, backoff and failure recovery.
• Experience integrating with a wide variety of third-party systems, including poorly documented or legacy APIs, and building abstractions that make new integrations faster to add.
• Secure handling of credentials and secrets at scale, such as token storage, encryption, rotation and per-tenant isolation.
• Strong TypeScript skills, as it is the team’s primary development language.
• Solid grasp of engineering best practices, automation and observability, using tools such as Datadog for monitoring and alerting on integration health.
• Comfortable in an agile, collaborative environment, communicating clearly with both technical and non-technical stakeholders, including external partners’ engineering teams.
• Experience leading technical initiatives, influencing architectural decisions or providing technical leadership across teams.

• Health insurance (after probation), on-site physiotherapist, office gym, and fitness classes.
• 7 extra days off, 3 for weddings, hybrid work, and the freedom to work 2 months from anywhere in the world.
• Pet-friendly office, fresh breakfasts, hot lunches, drawers and fridges stocked with snacks and food.
• Rooftop and cellar events keep things lively, while 10 social clubs give space to dive into passions and try new things.
• Public transport card for Vilnius and Perks.lt perks for smoother days.
• Coaching, mentorship, training, conferences, online courses, subscriptions, books – you’ve got a €1000 yearly budget to fuel personal or team growth.
• Build impact across 30+ brands worldwide.
• Launch bold projects.
• Step in as a co-founder – we reward those who push further.
• €1500 for every successful referral.