{"id":3966661,"url":"https://alion.io/job/obi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b","title":"Senior Backend Engineer (Java, Kotlin, Spring Boot, AWS) (B2B)","company":{"id":2754559,"name":"OBI","domain":"obi.pl","url":"https://alion.io/company/obi-pl","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"contractor","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Katowice, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon EKS","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"IAM","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"Kubernetes","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false}],"status":"live","first_seen_at":"2026-11-09T13:56:12Z","employer_posted_date":null,"last_verified_at":"2026-11-09T13:56:12Z","board_verified":false,"closed_at":null,"days_open":0,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":0},"description":"Responsibilities\nWe are looking for a strong backend engineer who wants to design and scale core systems powering product and assortment management across a large retail ecosystem.\nYou will take ownership of backend architecture and system evolution within the assortment management domain, building scalable services and integrations across a complex, event-driven enterprise landscape. You act as a technical driver within the team, working closely with architects, product owners and stakeholders to deliver robust, high-quality solutions.\nYour key responsibilities include:\nDesign and develop scalable backend services, APIs and integrations using Kotlin and Spring Boot within distributed systems.\n\nTranslate complex business and product data requirements into robust, maintainable and scalable system designs.\n\nLead the design and evolution of event-driven architectures and asynchronous processing using Kafka.\n\nDesign and integrate backend systems within AWS and Kubernetes-based enterprise environments.\n\nDrive data modeling and persistence strategies using PostgreSQL and cloud-native approaches.\n\nAct as a technical interface between business, product and engineering teams, leading solution design and backlog refinement.\n\nDrive engineering best practices, observability, reliability and architectural consistency across the platform.\n\nLead troubleshooting, optimization and continuous improvement initiatives while mentoring less experienced engineers.\n\nQualifications\nCompleted university degree in Computer Science or a comparable technical field.\n\n6+ years of professional experience in backend development using Kotlin and Spring Boot in complex environments.\n\nStrong expertise in REST APIs, microservices, distributed systems and event-driven architectures.\n\nDeep hands-on experience with Kafka and asynchronous processing patterns in production systems.\n\nStrong experience with AWS and Kubernetes (including Amazon EKS) in scalable environments.\n\nSolid experience with PostgreSQL and designing performant, reliable data models.\n\nExperience with CI/CD, containerization, observability tooling and modern security concepts (OAuth2, IAM).\n\nStrong communication skills in English and Polish, with readiness to work in a hybrid model in Katowice.\n\nAbout OBI Smart Technologies\n\nWHO ARE WE:\nWe are a joint venture between OBI and Reply Group, responsible for co-designing, building and operating mission-critical digital platforms for commerce, customer service, and omnichannel retail.\nOUR MISSION:\n\"We unite technology leadership with deep retail vision to implement standardized processes and scalable digital products that drive efficient support for one of Europe’s largest DIY retailers. Leveraging proven best practices, we advance the internationalization of products and the digital mindset of our partners, delivering consistent and business-critical solutions to support the targets of our customer.\"\n\nTech stack\nKotlin\nSpring Boot\nREST API\nMicroservices\nKafka\nAWS\nKubernetes\nAmazon EKS\nPostgreSQL\nCI/CD","description_format":"text","description_chars":3027,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Tools & DIY Supplies","Kitchens, Bathrooms & Home Improvement"],"lifecycle":[{"event":"open","at":"2026-11-09T14:25:00Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":30,"reasons":["seen:0","win:early"],"computed_at":"2026-11-09T22:14:54Z"},"pay":null,"html_url":"https://alion.io/job/obi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b","json_url":"https://alion.io/job/obi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b.json","meta":{"generated_at":"2026-11-09T22:14:54Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":11585,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":2754559},"rest":"https://alion.io/mcp/rest/get_company?id=2754559"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fobi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fobi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fobi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/obi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fobi-senior-backend-engineer-java-kotlin-spring-boot-aws-b2b"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3966661}},{"tool":"search_jobs","arguments":{"company":"obi.pl","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3966661},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. Docs: https://alion.io/developers"}}