{"id":489862,"url":"https://alion.io/job/frequentis-rou-senior-java-developer-mosaix","title":"ROU_Senior Java Developer - MosaiX","company":{"id":54731,"name":"Frequentis","domain":"frequentis.com","url":"https://alion.io/company/frequentis","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Avature","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":"inferred","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Cassandra","optional":false},{"name":"Docker","optional":false},{"name":"Go","optional":false},{"name":"JavaScript","optional":false},{"name":"Python","optional":false},{"name":"RabbitMQ","optional":false},{"name":"Red Hat","optional":false},{"name":"Scrum","optional":false},{"name":"CI/CD","optional":true},{"name":"Linux","optional":true},{"name":"WebSockets","optional":true}],"status":"live","first_seen_at":"2026-09-06T23:50:29Z","employer_posted_date":"2026-09-25","last_verified_at":"2026-10-23T09:49:30Z","board_verified":true,"closed_at":null,"days_open":46,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":46},"description":"WHY FREQUENTIS\nWE ARE LOOKING FOR\nWE OFFER\nJOBS\nApply now\nSenior Java Developer - MosaiX\nAir Traffic Management\nCluj-Napoca, Cluj FREQUENTIS Romania SRL Full time\n:\nShare:\nShare\nJob Introduction\nThe Frequentis Group is an international supplier of communication and information systems for control centres with safety-critical tasks. These ‘Control Centre Solutions’ are developed and distributed by Frequentis in the business segments Air Traffic Management (civil and military air traffic control, aeronautical information management, air defence) and Public Safety & Transport (police, fire and rescue services, emergency medical services, vessel traffic and railways). With headquarters in Vienna, the company employs more than 1800 people worldwide, with subsidiaries, regional offices and representatives in over 50 countries. \nIn Cluj we started in 2009 and our local team currently has 230+ colleagues and is growing.\nAs part of our team, you will actively develop products in an international environment, where experienced people will help you further develop your skills and advance in your career.\nYou will work on a microservices based framework used across the company to run and integrate multiple Frequentis products. You will develop reusable services, software packages and libraries to be used by other teams in the company. The product runs on RedHat 8/10, handles the deployment and configuration of the OS and supports the configuration and orchestration of services packaged as Docker images.\nWe are developing for a safety critical environment, following industry standards, where high availability and redundancy is a basic requirement. You will develop loosely coupled, highly available Java services, with lightweight REST and AMQP (RabbitMQ) interfaces, that use CQL (Cassandra) to store data. If you like to step out of your comfort zone, we also have components written in Go if you want to learn a new and fun language.\nKey Tasks\nTake part of the daily work of the scrum team consisting of sw-developers and test automation engineers.\nContribute to the design and architecture of the product\nWrite code according to the company processes and standards\nWrite unit and component tests\nSupport for the QA in testing and developing the automated system tests\nWriting documentation and requirements\nKey Qualifications\nMinimum 5 years of software development experience in Java\nExperience with Go, Python, JavaScript is a plus\nKnowledge of object-oriented concepts, design patterns and SOLID principles.\nPassionate about clean, unit tested and maintainable code\nExperience with Microservices, REST, messaging/AMQP, Websockets\nExperience with SOA, Domain Driven Design, Hexagonal architecture\nExperience with distributed systems and understanding of concepts (CAP theorem, redundancy, high availability, consensus protocols, etc.)\nKnow-how on continuous integration and delivery\nBasic knowledge of bash scripting and IP networking\nComfortable in performing testing and troubleshooting (even development) in Linux environment\nExperience with database systems, NoSQL is a plus\nGood English skills (both written and spoken) \nOur Values\nFrequentis team is committed to creating a safer world with our innovative strength and technology orientation. At Frequentis Romania we are a family, while we value and work under a safety-critical mindset. We believe in courage and expertise, applied in everything we accomplish.\nBenefits\nWe offer a range of benefits focused on work-life balance, professional development and flexibility.\n PRIVATE MEDICAL SPORT LUNCH EXTRA EXTRA PUBLIC TRANSPORT\n CERTIFICATIONS TRAININGS UNEQUAL WORK PRIVATE INSURANCE PACKAGE TICKETS VACATION DAYS WINTER HOLIDAY SUBSCRIPTION WORKING HOURS FROM HOME PENSION \nBenefits\nWe offer a range of benefits focused on work-life balance, professional development and flexibility.\n PRIVATE MEDICAL SPORT LUNCH EXTRA EXTRA PUBLIC TRANSPORT\n CERTIFICATIONS TRAININGS UNEQUAL WORK PRIVATE INSURANCE PACKAGE TICKETS VACATION DAYS WINTER HOLIDAY SUBSCRIPTION WORKING HOURS FROM HOME PENSION \nSalary\nYour individual salary is based on your professional experience and qualifications and is part of our attractive total package.\n\nApply now\nDiscover the best way of working\n\nVictoria-Luciana Bora\nHuman Resources\n|  | +40 799 983 653\n| Social media contact\nLooking forward in getting to know the person behind the CV. In addition to professional qualifications, personality is very important to us at Frequentis.\nApply now\nAt Frequentis we don’t just create innovations,we create a kind of wonderto make the world a safer place.\nREAD MORE ABOUT FREQUENTIS\nCAREER AWARDS","description_format":"text","description_chars":4681,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":["Professional development"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Events & Ticketing","Drones & UAVs","Public Transport"],"lifecycle":[{"event":"open","at":"2026-09-06T23:50:29Z"}],"visa":[],"liveness":{"score":29,"band":"fade","label":"Fading","p_open":1,"p_active":0.648,"p_room":0.45,"age_days":46,"expected_fill_days":29,"reasons":["conf:0","velocity","win:tail"],"computed_at":"2026-10-23T05:54:15Z"},"pay":null,"html_url":"https://alion.io/job/frequentis-rou-senior-java-developer-mosaix","json_url":"https://alion.io/job/frequentis-rou-senior-java-developer-mosaix.json","meta":{"generated_at":"2026-10-23T13:21:44Z","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":19924,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-24T00:00:00Z"}},"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":54731},"rest":"https://alion.io/mcp/rest/get_company?id=54731"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ffrequentis-rou-senior-java-developer-mosaix"},{"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%2Ffrequentis-rou-senior-java-developer-mosaix"},{"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%2Ffrequentis-rou-senior-java-developer-mosaix"},{"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/frequentis-rou-senior-java-developer-mosaix\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ffrequentis-rou-senior-java-developer-mosaix"}]}