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50,000+ businesses use Sintra because for the first time someone made AI actually useful for them. While Silicon Valley builds for tech companies, we're building for the florist who needs help with Instagram, the contractor drowning in invoices, the restaurant owner who can't keep up with reviews.

The timing matters. LLMs just got good enough to actually do the work - not just talk about it. We're at the moment where this becomes real infrastructure for millions of businesses.

We raised $17M in seed funding. Team of 50, based in Vilnius, shipping daily. We move fast, take ownership of what we build, and live by one principle - work is play.

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Who We're Looking For

• 2+ years hands-on with LLMs in production
• Has built evaluation systems, not just written prompts
• Strong technical skill set - you'll automate evals and work closely with engineering
• Systems thinker who can handle hundreds of use cases × user customization
• Clear communicator - you'll be our point person with technical teams of leading AI labs

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What You'll Do

• Own end-to-end quality of all AI outputs across the app
• Design and build our evaluation framework - automated tests, human review loops, quality scoring
• Create, version, and optimize prompts for every use case
• Build and maintain test datasets that catch regressions before users do
• Hire and lead a team of prompt engineers and eval specialists as we scale

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Our hiring process

• Fill in the application form. If we see a fit, we'll reach out for an intro call.
• Complete a take-home task that mirrors real work you'd do here. Be prepared to explain what you did and why.
• Join us for a tech call. Meet the team, see if we're right for each other.
• Get an offer if it's a mutual fit.

We understand good people have options, that's why we move super fast. Life's too short for drawn-out hiring processes.

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What we offer

• Compensation & Equity‍Top-of-market salary in Vilnius plus meaningful equity, so that you own a part of what you build. Salary range for this role: €5,000-8,000/month depending on expertise and experience.
• Seamless Relocation‍Relocation bonus and support to make your move to Vilnius smooth.

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