Founding Engineer

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 ($1.46M ARR and growing) building Marlow AI — an AI-assisted trip planning experience that hands off to a real human advisor to lock in the details and book the trip accurately. We are two-sided: travelers get a consumer product that plans and books real trips, and advisors get a SaaS-style subscription with certification and qualified leads baked into the offer.

Currently, we are looking for a Founding Engineer — someone who can own features end-to-end, from database schema through the server function layer, the UI, and the tracking that tells us whether it worked, and ship them without needing a hand-off. This is one of the first technical hires on the team: your fingerprints will be on the architecture, the integrations, and the decisions that shape how we scale from here.

Get ready to

Own features end-to-end: schema design → server function → UI/UX → event tracking → ship to production, using our stack of React 19, TanStack Start, Supabase (Postgres + RLS), and Cloudflare Workers

Work directly in the Marlow AI trip-planning flow and the advisor handoff/booking flow, across both the traveler-facing and advisor-facing surfaces

Design and evolve Postgres schemas with Supabase, including RLS policies and GRANTs that actually hold up under real traffic

Integrate and maintain third-party APIs — flights (Kiwi Tequila), hotels (Hotelston SOAP), payments (Primer, PayPal Marketplace), subscriptions/leads (Kilo Launchpad) — including auth, webhooks, and signature verification

Build and refine LLM-powered tooling inside Marlow’s orchestration layer (tool-calling, streaming, prompt iteration) across OpenAI, Anthropic, and OpenRouter

Instrument features against our unified event schema (view_item, add_to_cart, initiate_checkout, add_payment_info, payment_complete) so product and growth decisions are backed by real data

Ship on Cloudflare’s edge runtime and reason clearly about SSR vs. client boundaries in TanStack Start

Write tests where they earn their keep, and work alongside AI-agent dogfooding

Take ownership of ambiguous problems, make a call, and move — this is a one-engineer-per-feature environment, not a hand-off pipeline

Help shape technical direction as we grow — you won’t be handed a spec and a backlog forever; as the team grows, expect a voice in architecture calls and, over time, a hand in shaping the engineering team itself

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

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.