{"id":2303779,"url":"https://alion.io/job/aiven-fullstack-software-engineer-kafka","title":"Fullstack Software Engineer, Kafka","company":{"id":40678,"name":"Aiven","domain":"aiven.io","url":"https://alion.io/company/aiven","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":75,"open_postings":10,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":43,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Helsinki, Finland"],"countries":["FI"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":57000,"max_usd":115000,"period":"year","method":"role_country_seniority_unknown","sample_n":35},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Amazon S3","optional":false},{"name":"Apache Kafka","optional":false},{"name":"BigQuery","optional":false},{"name":"Buildkite","optional":false},{"name":"CI/CD","optional":false},{"name":"Claude Code","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Google BigQuery","optional":false},{"name":"Linux","optional":false},{"name":"OpenSearch","optional":false},{"name":"Python","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"TypeScript","optional":false},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"GCP","optional":true},{"name":"Java","optional":true},{"name":"JavaScript","optional":true},{"name":"Prometheus","optional":true}],"status":"live","first_seen_at":"2026-08-31T08:58:43Z","employer_posted_date":"2026-09-16","last_verified_at":"2026-10-13T06:50:11Z","board_verified":true,"closed_at":null,"days_open":42,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":42},"description":"We’re a global team of over 400+ people, working together to push the boundaries of open-source technology and multi-cloud solutions. Our vision is to help developers, builders, and creators bring their ideas to life with speed and simplicity, by providing a cloud data platform that makes open-source databases, search, streaming, and application infrastructure easily accessible to everyone. \nThe Role\nWe're looking for a Fullstack Software Engineer to join our Kafka Ecosystem team. You'll build features end-to-end: production Python in the platform that orchestrates managed Apache Kafka® services across clouds, contributions to Karapace (our open-source Schema Registry and Kafka REST Proxy), and the React interfaces that put those features in front of users. Your main focus is Python; your reach extends from API design to the UI that ships with it.\nWhat You'll Do\nExtend and maintain Karapace: schema compatibility logic, REST Proxy features such as exposing message headers in produce and consume paths, OpenAPI schema coverage, and Confluent API compatibility\nKeep the connector ecosystem healthy: upgrades and releases of connectors like Debezium, JDBC, S3, BigQuery, and the OpenSearch® sink, security fixes, and changelogs\nParticipate in design and code reviews, write well-tested code, and help shape technical direction\nShip code reliably and often through CI/CD pipelines (Buildkite, GitHub Actions)\nInvestigate and resolve production issues across the stack, from async Python application code down to Linux system behavior\nContribute to technical planning within a small team where your input directly shapes the roadmap\nOwn features end-to-end: design the API, build the async Python backend, and wire up the React/TypeScript views in our console\nUse AI coding tools as part of your daily workflow to speed up development\nWhat We're Looking For\nMust have:\nStrong Python skills: you're comfortable with async/await patterns, understand event loop semantics, and write production-grade code with type annotations and tests\nFull-stack ability: you can contribute confidently to a React/TypeScript codebase and take a feature from backend to shipped UI\nDistributed systems fundamentals: you reason clearly about consistency, replication, and failure modes\nFamiliarity with schema formats and evolution: Avro, JSON Schema, or Protobuf; you understand why schema compatibility matters\n Fluent in AI-assisted development: you actively use AI coding tools (Claude Code or similar) in your daily workflow, including automating repetitive processes and building AI-assisted workflows\nFluent English, written and verbal\nNice to have:\nHands-on Apache Kafka® experience: consumer groups, offset management, and the group coordination protocol\nLinux fundamentals: comfortable with process management and debugging at the OS level\nKafka Connect and connector development: custom connectors, transforms, or converters\nPrior open-source contributions, on any project\nExperience with public clouds (AWS, GCP, Azure) and cloud-managed Kafka (MSK, Confluent Cloud, or Aiven for Apache Kafka®) or other cloud-native distributed systems\nWorking Java knowledge, enough to contribute to Kafka Connect source/sink tasks\nExperience operating or extending a schema registry (Confluent or Karapace)\nExperience with observability tooling: distributed tracing, Prometheus metrics, structured logging\nWhy This Role\nOpen-source at the core. A significant part of your work ships publicly as open source. Your name goes on the commits.\nDeep technical problems. Multi-format schema compatibility, connector lifecycle orchestration at scale, and UIs that make both approachable. Not a typical backend role, and not a typical frontend role either.\nEnd-to-end ownership. You design it, build it, ship it, and see users work with it. No handoffs across three teams.\nDirect impact. The team is large enough to tackle ambitious problems and small enough that your technical judgement still shapes what gets built.\nHelsinki, hybrid. 3 days in the office per week.\nAmazing! What’s next:\nIf you think Aiven is the place for you and that ourValues align with yours, send us your resume and we’ll get in touch!\nGlobal Benefits:\nOur global benefits are designed to help you thrive and grow, personally and professionally:\nParticipate in Aiven’s equity plan.\nBalance work and life with our hybrid work policy.\nChoose the equipment you need to set yourself up for success.\nUse your Professional Development Plan budget for learning opportunities.\nReceive holistic wellbeing support through our global Employee Assistance Program.\nInquire about our Global Time Off Commitment (Parental and Sick Leave, as well as Personal Time)\nEnjoy country-specific benefits for our global cast.\nHow to Recognize and Avoid Employment Scams:\nThere has been a rise in fake job postings used by scammers to get personal information. At Aiven, all of our emails relating to recruitment come from an @aiven.io, @greenhouse.io or @eu.greenhouse.io domain and all of our interviews are conducted by video call or in person. Our interviews will never occur via text or chat. If you’re unsure of the legitimacy of a job opportunity/offer pertaining to Aiven, please don’t hesitate to reach out to us at .\nEqual Opportunities:\nAiven provides equal employment opportunities to all qualified employees and applicants for employment without regard to age, gender identity, national or ethnic origin, religion, sexual orientation, physical and mental ability, marital and family status or without regard to any other similar personal attributes. Aiven complies with applicable local laws governing non-discrimination in employment in every location in which the company operates. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, transfer, leaves of absence, compensation, training and any other terms and conditions related to employment.\nAt Aiven we are committed to providing reasonable accommodations for qualified individuals with disabilities or special needs in our working environment and job application procedures. We make all reasonable accommodations for persons with disabilities or who otherwise need support to thrive in the workplace. We are committed to continuously improving workplace accessibility. There is an option to request a discussion in the application process but if you have any questions before applying please write to us at .","description_format":"text","description_chars":6528,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"phd","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":["Equity","Hybrid work","Professional development"],"hiring_locations":[{"name":"Finland","iso":"FI","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Cloud Platforms (IaaS & PaaS)","Databases & DBMS"],"lifecycle":[{"event":"open","at":"2026-10-11T22:04:07Z"}],"visa":[],"liveness":{"score":34,"band":"fade","label":"Fading","p_open":1,"p_active":0.45,"p_room":0.75,"age_days":42,"expected_fill_days":43,"reasons":["conf:2","stale_co","win:late"],"computed_at":"2026-10-13T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/aiven-fullstack-software-engineer-kafka","json_url":"https://alion.io/job/aiven-fullstack-software-engineer-kafka.json","meta":{"generated_at":"2026-10-13T07:20:44Z","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":10812,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"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":40678},"rest":"https://alion.io/mcp/rest/get_company?id=40678"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Faiven-fullstack-software-engineer-kafka"},{"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%2Faiven-fullstack-software-engineer-kafka"},{"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%2Faiven-fullstack-software-engineer-kafka"},{"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/aiven-fullstack-software-engineer-kafka\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Faiven-fullstack-software-engineer-kafka"}]}