{"id":123949,"url":"https://alion.io/job/ajax-systems-middlesenior-java-developer","title":"Middle/Senior Java Developer","company":{"id":3575,"name":"Ajax Systems","domain":"ajax.systems","url":"https://alion.io/company/ajax-systems","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"B","score":82,"open_postings":177,"ghost_share":0.215,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":82,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Kyiv, Ukraine"],"countries":["UA"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":28000,"max_usd":83000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6933},"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"BigQuery","optional":false},{"name":"CI/CD","optional":false},{"name":"ClickHouse","optional":false},{"name":"Databricks","optional":false},{"name":"Google BigQuery","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"SQL","optional":false},{"name":"Angular","optional":true},{"name":"JavaScript","optional":true},{"name":"Power BI","optional":true},{"name":"React.js","optional":true},{"name":"TypeScript","optional":true},{"name":"Vue.js","optional":true}],"status":"live","first_seen_at":"2026-08-25T14:16:49Z","employer_posted_date":"2026-08-25","last_verified_at":"2026-10-17T02:18:34Z","board_verified":true,"closed_at":null,"days_open":52,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":51},"description":"Ajax Systems is an international technological company and Europe’s largest security system manufacturer. The product portfolio includes 280 wireless and wired devices for security and automation. Today, Ajax protects over 4.5 million users in 187 countries worldwide.\nWe are looking for a smart and technically proficient Middle/Senior Java Developer to join our team in Kyiv office.\nThe team develops internal tools to automate the management of manufacturing operations. The goal is to transform how our factories are planned and managed, taking the organization to a new level of operational efficiency and control within the next year.\nResponsibilities:\ndesign and implement core backend services and data pipelines.\nWrite clean, readable, and maintainable code.\nDevelop services for the B2B product line.\nActively participate in developing and improving the architecture.\nDocument architectural decisions and operational knowledge for successful deployment and service operations.\nEnsure appropriate test coverage with unit and integration testing.\nFocus on performance and cost efficiency within your areas of responsibility.\nFollow best practices in software design and development and promote them within the team.\nEnsure reliable alerting, dashboards, and runbooks for production services.\nDebug production issues, analyze complex cases, and conduct investigations.\nWork smoothly in a technical culture with testing, CI/CD, and DevOps.\nCollaborate within the team and with other engineering teams to develop new features and products according to business needs.\nRequired experience:\n4+ years of professional experience in Java development in an enterprise environment.\nStrong understanding and practical experience with Java Concurrency.\nStrong knowledge of Kotlin or solid Java expertise with a willingness to transition to Kotlin.\nPractical experience with Spring and SQL.\nHands-on experience with analytical databases such as Databricks, BigQuery or ClickHouse.\nUnderstanding of SOA, microservices and event-driven architecture.\nPractical experience with AWS and understanding of cloud development principles.\nExperience building and scaling high-load systems with a focus on high availability and reliability.\nStrong analytical and problem-solving skills.\nWould be a plus:\nexperience with Kotlin.\nExperience with Angular or React.js or Vue.js.\nExperience with Power BI.\nWe offer:\nthe opportunity to share and implement your own ideas that could impact products and production.\nWork with a motivated team and an environment with a zero-bullshit culture.\nMedical insurance.\nCorporate English classes.\nCompensation for professional training.\nThe chance to take part in beta testing of Ajax security systems - 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