{"id":2427586,"url":"https://alion.io/job/nsi-senior-java-developer","title":"Senior Java Developer","company":{"id":4428080,"name":"NSI","domain":"nsi.lu","url":"https://alion.io/company/nsi-5","size_band":null,"is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"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":["Luxembourg City, Luxembourg"],"countries":["LU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":72000,"max_usd":210000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6426},"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Spring Boot","optional":false},{"name":"Apache Kafka","optional":true},{"name":"Docker","optional":true},{"name":"GitHub","optional":true},{"name":"Gradle","optional":true},{"name":"Kotlin Coroutines","optional":true},{"name":"Maven","optional":true},{"name":"OpenShift","optional":true}],"status":"live","first_seen_at":"2026-10-13T08:05:53Z","employer_posted_date":null,"last_verified_at":"2026-10-13T08:05:53Z","board_verified":false,"closed_at":null,"days_open":1,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":1},"description":"NSI LUXEMBOURG\n\n Senior Java Developer\n\n Job description\n\n We are currently looking for a Senior Java Developer for one of our client in the financial sector.\n\nAs part of a major modernization initiative, our client is undertaking the complete redevelopment of an existing legacy application currently built in Delphi. The objective is to deliver a modern, scalable, and cloud-ready solution and successfully deploy it into production.\n\nYour main responsibilities as a Consultant\n\nLead the technical implementation of a complete rewrite of an existing business-critical application.\n\nDesign, develop, and maintain robust backend services and modern user interfaces.\n\nMake technical decisions aligned with the approved architecture and project objectives.\n\nEnsure architectural consistency across all developments.\n\nAct as a technical lead and coordinator for a team of two developers.\n\nReview code and promote development best practices.\n\nEnsure compliance with internal security standards, guidelines, and documentation.\n\nCollaborate closely with business and technical stakeholders.\n\nDefine, assign, and track development activities using the project's task management tools.\n\nSupport testing, integration, deployment, and production readiness activities.\n\nContribute to continuous improvement initiatives within the project team.\n\nWork effectively in an Agile delivery environment.\n\nYour profile\n\nMinimum 10 years of professional software development experience.\n\nProven experience as a Senior Developer, Lead Developer or Technical Lead.\n\nStrong sense of autonomy.\n\nFluent English is mandatory (minimum level C1), French is an asset\n\nExcellent verbal and written communication skills.\n\nTechnical skills :\n\nStrong expertise in Java or Kotlin, Spring Boot and the JVM ecosystem.\n\nExperience designing and developing RESTful APIs.\n\nGood knowledge of relational databases (PostgreSQL is a plus).\n\nFamiliarity with messaging technologies such as Kafka.\n\nProficiency in React ideally\n\nExperience with GIT/GitHub, Docker, and OpenShift.\n\nFamiliarity with build tools such as Maven or Gradle.\n\nExperience working in cloud-based environments.\n\nExperience working in Agile teams and using task management tools.\n\nNice to have:\n\nExperience with Kotlin Coroutines\n\nExperience with functional programming\n\nExperience with reactive frameworks such as Spring Webflux\n\nIf at the end of the recruitment process, your application is successful, you will be required to provide an extract from your criminal record in accordance with the requirements related to our PSF status.\n\nWhat is offered\n\nA dynamic and innovative work environment\n\nTraining programs and ongoing support\n\nPersonalized and individual career development with a dedicated point of contact\n\nA wide variety of assignments thanks to a rich and diverse client portfolio\n\nAn attractive salary package aligned with your skills and experience\n\nAdditional fringe benefits\n\nRegular events to get together and share great moments as a team\n\nTake the opportunity to join the “NSI family,” where human values remain at the heart of our priorities\n\nAs a signatory of the diversity charter, this position is open to everyone, without distinction of origin, nationality, gender, age, disability, religion, or sexual orientation.\n\n In short\n\n Website:\n\n www.nsi.lu \n\n House of Biohealth:\n\n 27 rue Henri Koch\n4354 Esch-sur-Alzette - Luxembourg\n\n Size:\n\n 50 employees\n\n IT sector:\n\n Infrastructure, Software, Professionnel Services","description_format":"text","description_chars":3468,"description_truncated":false,"requirements":{"experience_years_min":10,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-13T08:05:53Z"}],"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":23,"reasons":["seen:0","win:early"],"computed_at":"2026-10-14T06:34:16Z"},"pay":null,"html_url":"https://alion.io/job/nsi-senior-java-developer","json_url":"https://alion.io/job/nsi-senior-java-developer.json","meta":{"generated_at":"2026-10-14T16:59:51Z","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":21606,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-15T00:00:00Z"}},"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":4428080},"rest":"https://alion.io/mcp/rest/get_company?id=4428080"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fnsi-senior-java-developer"},{"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%2Fnsi-senior-java-developer"},{"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%2Fnsi-senior-java-developer"},{"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/nsi-senior-java-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fnsi-senior-java-developer"}]}