Product Engineer, Agents

ppAt Callimacus, we're working to change how people interact on the web. For the past 30 years, the user experience as we know it has been anchored to a typographic paradigm — predefined navigation trees of pages, sections, and menus — established in the Nineties when the web was born. /ppAs the way people get informed, entertained, and shop evolves, traditional websites and interfaces are losing relevance, and the tools available limit the creative evolution of digital experiences. Callimacus was born from the conviction that the whole web experience can and should be reinvented. /ppSo we built the engine for a different kind of digital experience. Callimacus is a multi-agentic platform that plugs into a company's existing stack and reads multi-dimensional signals to understand what a visitor wants in the moment. Then, in milliseconds, our proprietary technology composes the entire interface around that intent, selecting the most relevant content and components as the person interacts. /ppCallimacus was founded in 2024 with the early backing of Brunello Cucinelli — one of our first investors, and now one of our customers. We launched in January 2026 to strong organic interest from enterprise customers, and recently raised from Salesforce Ventures the largest AI investment they have made in Italy, and one of their most significant in Europe. /ppWe are a small, product-focused, founder-led team. We work on hard problems that haven't been solved before — by us or anyone else — and the people who join now get to solve them. We move fast, with high agency and strong ownership. /ph3About Callimacus /h3pAt Callimacus, we're working to change how people interact on the web. For the past 30 years, the user experience as we know it has been anchored to a typographic paradigm — predefined navigation trees of pages, sections, and menus — established in the Nineties when the web was born. /ppAs the way people get informed, entertained, and shop evolves, traditional websites and interfaces are losing relevance, and the tools available limit the creative evolution of digital experiences. Callimacus was born from the conviction that the whole web experience can and should be reinvented. /ppSo we built the engine for a different kind of digital experience. Callimacus is a multi-agentic platform that plugs into a company's existing stack and reads multi-dimensional signals to understand what a visitor wants in the moment. Then, in milliseconds, our proprietary technology composes the entire interface around that intent, selecting the most relevant content and components as the person interacts. /ppCallimacus was founded in 2024 with the early backing of Brunello Cucinelli — one of our first investors, and now one of our customers. We launched in January 2026 to strong organic interest from enterprise customers, and recently raised from Salesforce Ventures the largest AI investment they have made in Italy, and one of their most significant in Europe. /ppWe are a small, product-focused, founder-led team. We work on hard problems that haven't been solved before — by us or anyone else — and the people who join now get to solve them. We move fast, with high agency and strong ownership. /ph3What you'll build /h3pYou'll join a small senior team at the point where the platform's foundations are still being set. Callimacus is in production with demanding customers, and the architecture, the performance envelope, and the shape of the developer experience are all still yours to influence. Decisions you make in your first months will still be load-bearing in three years. /pullibOwn the orchestration layer. /bDesign how our agents turn multi-dimensional visitor signals into intent, and intent into a fully composed interface — in milliseconds, in production, for demanding enterprise customers. /lilibPut inference on the critical path — and keep it fast. /bModel routing, caching, fallbacks, and latency budgets for a system where “the model is thinking” is not an acceptable state. /lilibBuild the retrieval and selection pipeline. /bEmbeddings, vector search, ranking, and the content-selection logic that decides what a visitor sees next. /lilibMake agent behavior measurable. /bEvals, tracing, and feedback loops, so quality is an engineering discipline rather than a feeling. /lilibShape how customers extend the system. /bTools, guardrails, and configuration — the primitives others will build on. /li /ulh3What matters to us /h3pThese are the same for every role at Callimacus. We hire people who get the job done and care about the end result — the product, the experience, the people using it. /pullibOwnership. /bYou feel deeply responsible for your work and behave accordingly — from design through production and after. You don\'t wait to be told what to do; you see problems and act. “It\'s not my job” is not part of your mindset. /lilibInvention. /bYou light up at hard problems and are creative at finding solutions. You experiment, get your hands dirty, and land things. You hold very high standards and always look for ways to improve. /lilibTeam-oriented. /bYou're someone others can count on. You support the best idea even when it's not yours, disagree productively, give and take feedback, share credit, and take on unglamorous work when that's what the team needs. /li /ulpbThe craft bar for this role: /bStrong TypeScript and Node.js, with a track record of shipping production systems. AI systems literacy: RAG, embeddings, vector databases, and agent orchestration are part of your working vocabulary. You don't need to have trained a model; you do need to know what breaks when inference sits on the critical path. /ph3Where you might be strong /h3pWe're early, and nobody is strong in all of these — we don't expect you to be. Depth in two or three, plus curiosity about the rest, is what wins. If that's you, apply even if you don't tick every box. /pulliAgent orchestration and multi-step LLM workflows /liliRAG, embeddings, and vector databases in production /liliPrompt and eval engineering at scale /liliStreaming and real-time systems /liliBackend performance work — latency budgets, caching, load /liliData pipelines feeding AI systems /li /ulh3Bonus points /h3ulliExperience as an early engineer at a startup or fast-growing company /liliShipped inference-heavy or data-intensive products /liliOpen-source work in the AI tooling space /li /ulh3What we offer /h3pWe'll ask a lot of you, and we give a lot in return. We want Callimacus to be a place where talented, driven people flourish, and we take that commitment seriously. A few things you'll find (and there's more): /pullibA product that will light you up. /bYou'll work at the frontier of what AI can do today, on problems nobody has solved before — which means most weeks you'll be reasoning from first principles rather than looking up how it's done. What you land becomes the way it works. /lilibAn exceptional opportunity for growth. /bYou'll work directly with the founders in a small, senior, talent-dense team, with high agency from day one, and play an essential role in the growth of the company. /lilibTop-of-the-Italian-market salary and equity. /bYou'll own a real piece of what you're building, aligning your growth with the company\'s long-term success. /lilibAmazing offices in the centre of Milan. /bIn the Moscova neighbourhood, one of the liveliest areas in the city and twenty minutes from anywhere. /lilibTop-of-the-market health insurance. /bComprehensive cover, for you and the people who depend on you. /lilibA welfare budget you decide how to spend. /bGym, mental health, museums, courses, travel — whatever actually makes your life better. /lilibGenuinely good food all day. /bHigh-quality, restaurant-level meals, including breakfast, lunch, and all-day snacks. /li /ulh3One note before applying /h3pWe believe working side by side leads to faster progress, stronger ramp-up, and a culture built around community. For the next year we have decided to be in-person first. We've invested in making our workplace worth coming to, and we're happy to support your commuting. And we don't work by tickets: priorities get redefined often, sometimes mid-week, and you'll need to be comfortable with that. If you're set on remote or on a settled roadmap, this isn't your role. If you want to be in the room while the platform takes shape, we'd like to meet you. /ppbLocation: /bOn-site, central Milan (Moscova area) /ppbStack: /bTypeScript (Node.js), AWS, RAG/LLM/agent orchestration /ppbExperience: /b4–6 years (Mid) or 6+ years (Senior) /ppbGross annual salary: /b€45–55k (Mid) / €55–65k (Senior), plus equity /p /p #J-18808-Ljbffr