The Best of Both Worlds

About The Company
At Maisa, we believe great work happens when people have the freedom to choose the setup that works best for them.
Prefer the flexibility of remote work? You're welcome to work remotely. Looking for some social energy? Our hybrid setup gives you the option to connect and work alongside teammates at our hubs in Valencia, Barcelona, Madrid and Murcia. We also want the time we spend together in person to be worth it. Rather than inheriting a finished playbook, you'll have a voice in creating it.
It's deep, hands?on model work in Python and PyTorch, with a strong emphasis on evaluation and on getting models into reliable production use inside highly regulated environments — banks, insurers, and telecoms where getting it wrong isn't an option. stage company, and the AI team is growing quickly. You'll have real ownership over what we build and how we build it.train Maisa's own small and large language models — from data preparation through to evaluation and releaseDesign and run rigorous model evaluation: benchmarks, regression sets, and quality criteria that reflect real client use cases rather than leaderboard scoresBuild and improve training pipelines and infrastructure, including data curation, experiment tracking, and reproducibilityApply and adapt modern training techniques — parameter?training and alignment methods — and evaluate their real impactWork with our AI infrastructure function on model serving and inference optimisation (vLLM, SGLang), including the constraints of deploying inside client environmentsMonitor deployed models for quality degradation and drift,



and drive the retraining or corrective work requiredHelp shape our model strategy — where custom models genuinely add value versus using frontier models or deterministic codeCollaborate closely with our Applied AI, product, and engineering teams to make sure models meet real product and client needsWhat We're Looking For Genuine, current, hands?on experience training and fine?tuning models — this is a builder's role, not a supervisory oneStrong PyTorch depth: comfortable building and modifying model architectures directly, not only running existing pipelinesRigorous approach to evaluation — you can explain how you know a model is actually good, and how you'd detect regressions and degradationSolid software engineering fundamentals in PythonSound judgment on when custom models are worth the investment, weighed against accuracy, cost, and latencyComfortable working in a fast?stage or scaling startupLocation Fully remote. stage AI start?ups, working on genuinely differentiated technology: building and training our own models rather than wrapping someone else's, in a domain where reliability and auditability actually matter. Following our recent $25m Seed Round, backed by leading Venture Capital firms including Creandum, Forgepoint, NFX, and Village Integral, we're scaling quickly and realising significant enterprise traction — working with clients including Santander. By submitting this application, I agree that my personal data will be collected, processed, and retained by the company solely for the purposes of managing and assessing my candidacy. #

📌 Software Developer Engineering · · Fully Remote (Valencia)
🏢 Maisa
📍 Valencia