{"id":2179215,"url":"https://alion.io/job/westcode-senior-backend-engineer-java-kotlin","title":"Senior Backend Engineer – Java / Kotlin","company":{"id":3148752,"name":"WestCode","domain":"westcode.tech","url":"https://alion.io/company/westcode","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":"remote","remote_scope":"stated_countries","remote_scope_basis":"inferred_payroll_markers","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Kraków, Poland","Warsaw, Poland","Wrocław, Poland","Poznań, Poland","Gdańsk, Poland"],"countries":["PL"],"hiring_countries":["PL"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":59000,"max_usd":94000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":213},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"Docker","optional":false},{"name":"Grafana","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"Kubernetes","optional":false},{"name":"OpenTelemetry","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Prometheus","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false}],"status":"live","first_seen_at":"2026-10-09T12:47:57Z","employer_posted_date":null,"last_verified_at":"2026-10-09T12:47:57Z","board_verified":false,"closed_at":null,"days_open":2,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":2},"description":"Senior Backend Engineer – Java / Kotlin\nBanking & Investment Technology | High-Volume Financial Systems\n\nThe Mission\nWest Code is hiring experienced backend engineers for technology projects with banks, investment firms and other financial institutions. We are looking for people who have already worked in complex, regulated or high-volume financial environments and understand that reliability, data consistency and production ownership matter as much as clean code.\nDepending on the project, you may work on investment-banking platforms, transaction-processing systems, risk and position services, market-data platforms, core banking components or other business-critical backend services.\nWhat You’ll Build\nbackend services using Java and/or Kotlin\n\nSpring Boot-based microservices and APIs\n\nevent-driven and distributed systems\n\nhigh-volume transactional and data-processing services\n\nintegration layers connecting internal and external financial systems\n\nservices where consistency, resilience and auditability are critical\n\nproduction-ready systems designed for scale, high availability and observability\n\ntechnical solutions developed together with senior engineers, architects and business stakeholders\n\nMust Have\n5+ years of backend engineering experience\n\nstrong Java and/or Kotlin\n\nSpring Boot and microservice architectures\n\nKafka or another event-streaming / messaging platform\n\nREST APIs and system integrations\n\nSQL / PostgreSQL or another relational database\n\nDocker and CI/CD\n\nexperience with production systems and incident / failure handling\n\ngood English\n\nability to work independently and take technical ownership\n\nStrong Advantage\ncommercial experience in banking, investment banking, capital markets or another regulated financial environment\n\nhigh-throughput or latency-sensitive systems\n\ntrading, market data, positions, risk, pricing or post-trade systems\n\ncore banking, ledger or transaction-processing platforms\n\ndistributed consistency, idempotency and failure-recovery patterns\n\nKubernetes and AWS / Azure / GCP\n\nOpenTelemetry, Prometheus, Grafana or similar observability tooling\n\nexperience working with security, audit or regulatory requirements\n\nEngineering Environment\nJava / Kotlin · Spring Boot · Kafka · PostgreSQL · Docker · Kubernetes · Cloud · REST APIs · OpenTelemetry · CI/CD\nWorking Model\nB2B cooperation\n\nremote or hybrid work depending on the project\n\nprojects for banks, investment firms and financial-services organisations\n\ninternational engineering environments\n\nEnglish used on most projects\n\nB2B Rate\n170–220 PLN/h + VAT\nFinal rate depends on seniority, domain experience and project scope.\nWhy West Code\nWest Code builds engineering teams around ownership and strong technical delivery, not just individual roles. We are developing a dedicated business unit focused on technology projects for banks, investment firms and other financial-services organisations.\nYou’ll work on systems where scale, reliability and business context genuinely matter, with direct access to experienced technical leadership and practical AI-assisted engineering workflows supporting quality, requirements context and knowledge transfer.\nIf you have already built serious financial systems and want to work on projects where backend engineering has real business impact, apply and let’s talk.\nTech stack\nJava\nSpring Boot\nKafka\nREST API\nSQL\nPostgreSQL\nDocker\nCI/CD\nKotlin","description_format":"text","description_chars":3402,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Hybrid work"],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Design & Creative","Web Design","Digital Design"],"lifecycle":[{"event":"open","at":"2026-10-09T14:27:15Z"}],"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":29,"reasons":["seen:0","win:early"],"computed_at":"2026-10-10T05:45:15Z"},"pay":null,"html_url":"https://alion.io/job/westcode-senior-backend-engineer-java-kotlin","json_url":"https://alion.io/job/westcode-senior-backend-engineer-java-kotlin.json","meta":{"generated_at":"2026-10-12T04:00:58Z","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":6277,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"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":3148752},"rest":"https://alion.io/mcp/rest/get_company?id=3148752"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fwestcode-senior-backend-engineer-java-kotlin"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"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%2Fwestcode-senior-backend-engineer-java-kotlin"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"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%2Fwestcode-senior-backend-engineer-java-kotlin"},{"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/westcode-senior-backend-engineer-java-kotlin\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fwestcode-senior-backend-engineer-java-kotlin"}]}