{"id":2938735,"url":"https://alion.io/job/cyclad-senior-back-end-developer","title":"Senior Back-end Developer","company":{"id":895,"name":"Cyclad","domain":"cyclad.eu","url":"https://alion.io/company/cyclad","size_band":"51-200","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Recruitify","truth_index":{"grade":"B","score":75,"open_postings":104,"ghost_share":0.413,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":41,"computed_at":"2026-10-23T05:54:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":85,"max":120,"currency":"PLN","period":"hour","gross":false,"usd_annual":62000},"salary_estimate":null,"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"CloudFormation","optional":false},{"name":"Docker","optional":false},{"name":"Git","optional":false},{"name":"Java","optional":false},{"name":"Jenkins","optional":false},{"name":"Kanban","optional":false},{"name":"Maven","optional":false},{"name":"OWASP","optional":false},{"name":"Rest API","optional":false},{"name":"Scrum","optional":false},{"name":"Spring Boot","optional":false},{"name":"SQL","optional":false},{"name":"Angular","optional":true},{"name":"Confluence","optional":true},{"name":"JavaScript","optional":true},{"name":"Jira","optional":true},{"name":"OpenSearch","optional":true},{"name":"Redis","optional":true},{"name":"TypeScript","optional":true}],"status":"live","first_seen_at":"2026-10-19T00:00:00Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-23T20:33:15Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":4},"description":"At Cyclad, we work with top international IT companies to help them deliver cutting-edge technologies and innovative digital solutions. We are currently looking for an experienced Senior Back-end Developer to join a team responsible for designing, developing, and maintaining scalable, secure, and high-quality backend solutions.\nThe project focuses on backend development, code optimization, and building maintainable and reliable applications. In this role, you will work with Java 21, Spring Boot 4.x, REST APIs, cloud technologies, and infrastructure automation, contributing to technical improvements while collaborating with business and technical stakeholders.\nProject information:\nType of project: IT services\nOffice location: Warsaw, Poland \nWork model: Hybrid (3 days in the office and 2 days remotely)\nBudget: 85-120 PLN net/hour - B2B\nExperience: 6+ years\nProject length: Long-term\nStart date: ASAP (depending on the candidate's availability)\nOnly candidates with citizenship in the European Union and résidence in Poland\nYour responsibilities:\nDesign and develop high-quality backend components and scalable solutions\nBuild secure, maintainable, and testable applications\nCollaborate with business and technical stakeholders to understand and refine requirements\nAssess technical feasibility and propose appropriate solutions\nOptimize existing code to improve performance and maintainability\nSupport testing, deployment, and technical documentation\nShare technical best practices and support less experienced developers\nContribute to continuous improvement within an Agile development environment\nRequirements:\nStrong hands-on experience in backend development, with at least 5 years of relevant experience\nExpert knowledge of Java 21 and Spring Boot 4.x\nExpert knowledge of HTTP and REST APIs\nExperience with AWS or other cloud platforms\nKnowledge of Infrastructure as Code, particularly CloudFormation or CDK\nExperience with SQL and Oracle\nKnowledge of Kafka or other streaming technologies\nExperience with Docker, Jenkins, Maven, and Git\nKnowledge of OWASP security standards\nStrong understanding of Agile methodologies, including Scrum and Kanban, as well as DevOps practices\nFluent professional English\nStrong analytical and problem-solving skills\nAbility to work independently while collaborating effectively within an Agile team\nWillingness to work in a hybrid model, with 3 days per 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