{"id":2721180,"url":"https://alion.io/job/keyes-senior-full-stack-software-engineer","title":"Senior Full-stack Software Engineer","company":{"id":54374,"name":"Keyes","domain":"keyes.eu","url":"https://alion.io/company/keyes","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Recruitee","truth_index":{"grade":"B","score":75,"open_postings":11,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"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":["Brussels, Belgium"],"countries":["BE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":57000,"max_usd":169000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6933},"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"CI/CD","optional":false},{"name":"Java","optional":false}],"status":"live","first_seen_at":"2026-10-16T13:39:26Z","employer_posted_date":"2026-10-16","last_verified_at":"2026-10-16T19:03:55Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Joining KEYES means giving purpose to your talent.\nAre you looking for an environment where technology is not an end in itself, but a lever to build a sustainable future? At KEYES, we are not just looking for technical expertise; we are looking for people who share our values.\nDo you want to continue your career and grow within one of Belgium’s leading IT companies?\nJoin KEYES as aSenior Full-Stack Software Engineer!\nKEYES is a dynamic global organization that takes pride in being the trusted partner ofEU Institutions. With strong commitment to excellence and a 30-years track record of delivering high-quality solutions, we are dedicated to supporting the growth and success of our clients. Our Mission is to help our clients keep up with the challenges of digital transformation by providing the right talent at the right time for the right job. To this end, we are constantly looking for talented professionals who are interested in working on challenging international projects and able to deliver high-quality results within multicultural environments. Our services include (but are not limited to) Modernization of Solutions, Digital Workspaces, Infrastructure & Cloud Solutions, Cybersecurity Solutions, Business Software Solutions, Mainframe Solutions, Data & AI Solutions, Advisory Solutions, and Staffing Solutions. Our Headquarters are in Brussels and we have active accounts and offices across Europe (i.e. Luxembourg, Athens, Brussels, etc.)\nMore information: www.keyes.eu\nTHE BACKGROUND\nFor our client, a European Institution based in Brussels, we are looking for an experienced Full-stack Software Engineer to join a long-term mission in a major EU Institution. For the needs of the client, you need to visit the customer in Brussels up to 2 times per week.\nThe ideal profile is a Java developer with 12 years in software development, maintenance, support and operations.\nThe principal aim of this position is to maintain, optimize, and evolutionarily develop the institution’s core financial and operational systems across the current and upcoming strategic frameworks. The role requires executing rigorous business analysis, implementing targeted technical enhancements, and managing structured change requests to guarantee long-term operational efficiency, system stability, and continuous alignment with the evolving business requirements within established corporate frameworks and processes.\nYOUR RESPONSIBILITIES:\nDevelopment of front-end website architecture\n\nDesign of user interactions on web pages\n\nDevelopment of back-end website applications\n\nImplement core business logic\n\nApply data and security best practices: input validation, authentication/authorization, secure storage, compliant logging and monitoring.\n\nEnsure web applications are optimized for performance and functionality across different browsers and devices\n\nDesign responsive applications\n\nDesign and develop APIs\n\nParticipating in the design and creation of scalable software\n\nMaintenance of code integrity and organisation\n\nWriting clean, functional code on the front- and back-end\n\nCompile and analyse data, processes, and codes to troubleshoot problems and identify areas for improvement\n\nPerform unit/integration testing, debug, fix, and validate code changes\n\nDeliver solutions that fulfil functional and non-functional requirements and align with user expectations\n\nWrite technical documentation\n\nDevelop and maintain features across the entire stack, from designing user interfaces and consuming APIs to implementing server-side business logic and database interactions\n\nDeploy and manage applications on cloud platforms using CI/CD pipelines and containerization technologies\n\nBridge the gap between front-end and back-end developers, facilitating communication and ensuring cohesive integration of all system components.\n\nRequirements\nAre you the perfect match?\nBachelor degree\n\nMinimum 10 years of IT professional experience\n\n8 minimu years of Full-stack Java/JEE development experience\nOne of the following certificiate is a requiremnet:\n\nAWS Certified Developer - Associate or Microsoft Azure Developer Associate\n\nAn AWS or Azure certification\n\nAWS Developer Associate or Azure Developer Associate certifications. and/or\nRecent, hands-on development experience with AWS or Azure, utilizing recognized software development standards in a professional environment.","description_format":"text","description_chars":4375,"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":["Cybersecurity","Information Technology","Hospitals & Health Systems","Managed IT Services (MSP)"],"lifecycle":[{"event":"open","at":"2026-10-16T14:56:14Z"}],"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":24,"reasons":["conf:2","win:early"],"computed_at":"2026-10-16T21:06:16Z"},"pay":null,"html_url":"https://alion.io/job/keyes-senior-full-stack-software-engineer","json_url":"https://alion.io/job/keyes-senior-full-stack-software-engineer.json","meta":{"generated_at":"2026-10-16T21:06:16Z","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":1893,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-17T00:00:00Z"}},"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":54374},"rest":"https://alion.io/mcp/rest/get_company?id=54374"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fkeyes-senior-full-stack-software-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%2Fkeyes-senior-full-stack-software-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%2Fkeyes-senior-full-stack-software-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/keyes-senior-full-stack-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fkeyes-senior-full-stack-software-engineer"}]}