We’re looking for a Senior Backend Engineer who thinks beyond endpoints and wants real influence on how backend systems are designed and evolved.We build backend systems for mobile applications used at scale, working mostly on long-lived products, not short-term experiments. Node.js and Java are tools we use - architecture and decision-making matter more.What you’ll do: Design and evolve API-first backend systems for mobile apps at real scale Build and maintain Backend-for-Frontend (BFF) layers Make architectural decisions with real constraints: performance, cost, reliability, security Work closely with product teams and clients to turn business needs into technical solutions Join projects early (discovery, architecture, estimations) and take ownership over outcomes Tech (what matters)Must-have Strong experience with Node.js or Java API design (REST, async) SQL databases Cloud basics (AWS or similar) Good to know: Event-driven systems / messaging CI/CD and observability OAuth2 / JWT Kafka, GraphQL, Kubernetes - nice to have, not required How we use AI AI is part of daily work (coding, reviews, discovery) Used critically, not blindly Tools and support included We’re looking for someone who Thinks architecturally, not just implementation-first Understands trade-offs: time, quality, cost, risk Has 4+ years of commercial experience Takes ownership and communicates well with non-backend stakeholders This role may not be for you if You only want to implement predefined tasks You avoid architectural responsibility You’re not comfortable with AI being part of the engineering process Why join Real impact on architecture and technical decisions Systems with scale and long-term ownership Pragmatic engineering culture - no buzzwords, no chaos We value your trust in providing us your data, thus we are striving to use commercially acceptable means of protecting it. Below you will find the necessary information about the data we collect and process when you send us your CV.The controller of your personal data is Miquido Spółka z ograniczoną odpowiedzialnością sp. k. with its seat in Krakow, Zabłocie 43a, 30-701 Kraków, Poland (“Miquido”, “We”, “Our” or “Us”). See more