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 scaleBuild and maintain Backend-for-Frontend (BFF) layersMake architectural decisions with real constraints: performance, cost, reliability, securityWork closely with product teams and clients to turn business needs into technical solutionsJoin projects early (discovery, architecture, estimations) and take ownership over outcomesTech (what matters)Must-haveStrong experience with Node.js or JavaAPI design (REST, async)SQL databasesCloud basics (AWS or similar)Good to know:Event-driven systems / messagingCI/CD and observabilityOAuth2 / JWTKafka, GraphQL, Kubernetes - nice to have, not requiredHow we use AIAI is part of daily work (coding, reviews, discovery)Used critically, not blindlyTools and support includedWe’re looking for someone whoThinks architecturally, not just implementation-firstUnderstands trade-offs: time, quality, cost, riskHas 4+ years of commercial experienceTakes ownership and communicates well with non-backend stakeholdersThis role may not be for you ifYou only want to implement predefined tasksYou avoid architectural responsibilityYou’re not comfortable with AI being part of the engineering processWhy joinReal impact on architecture and technical decisionsSystems with scale and long-term ownershipPragmatic engineering culture - no buzzwords, no chaosWe 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