{"id":2245894,"url":"https://alion.io/job/qualco-senior-java-backend-engineer","title":"Senior Java Backend Engineer","company":{"id":55578,"name":"QUALCO","domain":"qualco.tech","url":"https://alion.io/company/qualco","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"B","score":75,"open_postings":7,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-13T05:45:00Z"}},"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":["Athens, Greece"],"countries":["GR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":28000,"max_usd":81000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6426},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Apache Kafka","optional":false},{"name":"Azure","optional":false},{"name":"Azure Cosmos DB","optional":false},{"name":"Docker","optional":false},{"name":"gRPC","optional":false},{"name":"Java","optional":false},{"name":"JUnit","optional":false},{"name":"Kubernetes","optional":false},{"name":"Mockito","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"Swagger","optional":false},{"name":"Testcontainers","optional":false},{"name":"Azure AKS","optional":true},{"name":"Azure DevOps","optional":true},{"name":"GDPR","optional":true},{"name":"Kotlin","optional":true}],"status":"live","first_seen_at":"2026-10-12T18:21:34Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-13T15:21:48Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"At Quento Technologies S.A., the ICT arm of the Qualco Group, we deliver comprehensive and innovative solutions across AI, Digital Engineering, Cloud, and Cybersecurity, helping businesses accelerate digital transformation. With a presence in Greece, Luxembourg, and Belgium, and backed by the expertise of the Qualco Group, we combine deep technical knowledge with strategic partnerships to support business growth.\nAt Quento Technologies S.A. we empower our people to innovate and lead in delivering transformative ICT solutions to our clients worldwide. Quento Technologies S.A. seeks a highly motivated and experienced Senior Java Backend Engineer to design, build, and maintain modern, scalable backend services. You will work on microservice-based architectures, event-driven systems, and cloud-native applications using modern Java and Spring Boot, collaborating closely with DevOps and platform teams.\nYour responsibilities will entail:\nDesign and develop backend microservices using Java 21 and Spring Boot 3.x;\nBuild and maintain RESTful APIs with clear error handling and documented OpenAPI/Swagger specifications;\nImplement gRPC services and clients, including Protobuf schema design;\nDevelop event-driven solutions using Apache Kafka consumers and producers;\nIntegrate backend services with external systems (OIC, Salesforce, SAP ISU);\nImplement authentication and authorization using OAuth 2.0 / OIDC, including token validation and role-based access;\nWrite unit and integration tests using JUnit 5, Mockito, and Testcontainers;\nCollaborate with DevOps teams on containerized deployments in Docker and Kubernetes;\nEnsuring that all activities and duties are carried out in full compliance with regulatory requirements and supporting the continued implementation of the Group Anti-Bribery and Corruption Policy.\nRequirements\nUniversity degree in Computer Science, Engineering, or a related field;\n3-5+ years of experience in backend development;\nStrong hands-on experience with Java (preferably Java 21) and modern language features;\nProven experience with Spring Boot (microservices, REST controllers, data access layers, security);\nExperience migrating applications from older Java versions (e.g., Java 11);\nSolid knowledge of Kafka-based event-driven architectures;\nExperience with PostgreSQL, Azure Cosmos DB, and Redis;\nGood understanding of containerization (Docker) and Kubernetes fundamentals;\nStrong understanding of backend security concepts (OAuth2, OIDC, RBAC);\nExperience writing automated tests at unit and integration level;\nExperience working in an Agile environment;\nNice to Have\nIntegration experience with Confluent Kafka or Azure Event Hubs;\nExposure to AKS environments;\nPrevious work with enterprise integrations (Salesforce, SAP ISU);\nFamiliarity with cloud-native observability tools;\nFamiliarity with Azure DevOps.\nBenefits\nYour Life @ Qualco Group\nOn top of challenging work environment, we are offering:\nCompetitive compensation, ticket restaurant card, and annual bonus programs\nCutting-edge IT equipment, mobile and data plan\nModern facilities, free coffee and beverages, indoor parking, and company bus\nPrivate health insurance, onsite occupational doctor, and workplace counselor\nFlexible working model, hybrid benefits & home equipment benefits\nOnsite gym, wellness facilities, and ping pong room\nCareer and talent development tools\nMentoring, coaching, personalized annual learning and development plan\nEmployee referral bonus, regular wellbeing, ESG and volunteering activities\nYour race, gender identity and expression, age ethnicity or disability make no difference in Quento Technologies S.A. We want to attract, develop, promote, and retain the best people based only on their ability and behavior.\nDisclaimer: Quento Technologies S.A. collects and processes personal data in accordance with the EU General Data Protection Regulation (GDPR). We are bound to use the information provided within your job application for recruitment purposes only and not to share these with any third parties. For more details on the processing of your personal data during the Recruitment procedure, please be informed in the Recruitment Notice, before the submission of your application.","description_format":"text","description_chars":4222,"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":["Flexible schedule","Health insurance"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Artificial Intelligence","Debt Collection & Recovery","Supply Chain","Factoring & Trade Finance"],"lifecycle":[{"event":"open","at":"2026-10-11T02:03:36Z"}],"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":37,"reasons":["conf:1","win:early"],"computed_at":"2026-10-13T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/qualco-senior-java-backend-engineer","json_url":"https://alion.io/job/qualco-senior-java-backend-engineer.json","meta":{"generated_at":"2026-10-13T15:53:09Z","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":24056,"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":55578},"rest":"https://alion.io/mcp/rest/get_company?id=55578"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fqualco-senior-java-backend-engineer"},{"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%2Fqualco-senior-java-backend-engineer"},{"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%2Fqualco-senior-java-backend-engineer"},{"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/qualco-senior-java-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fqualco-senior-java-backend-engineer"}]}