{"id":1048983,"url":"https://alion.io/job/raytheon-technologies-senior-software-engineer-atms","title":"Senior Software Engineer ATMS","company":{"id":1162,"name":"RTX","domain":"rtx.com","url":"https://alion.io/company/raytheon-technologies","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":81,"open_postings":419,"ghost_share":0,"stale_share":0.747,"repost_share":0.019,"time_to_fill_p50_days":29,"computed_at":"2026-11-04T06:34:25Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Harlow, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":77000,"max_usd":149000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":139},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"Configuration Management","optional":false},{"name":"RTOS","optional":false},{"name":"UML","optional":false},{"name":"Scrum","optional":true}],"status":"live","first_seen_at":"2026-09-16T00:00:00Z","employer_posted_date":"2026-09-16","last_verified_at":"2026-11-04T18:05:58Z","board_verified":true,"closed_at":null,"days_open":49,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":49},"description":"Date Posted:\n2026-09-16\n\nCountry:\nUnited Kingdom\n\nLocation:\nHarlow, Essex\n\nPosition Role Type:\nHybridBenefits:\n£: Competitive salary\nContributory Pension Scheme (up to 10.5% company contribution)\n6 times salary ‘Life Assurance’ with pension\n25 days holiday (increasing with service) + statutory public holidays, plus opportunity to buy and sell up to 5 days (37hr)\nCompany bonus scheme 4% (discretionary)\nFlexible Benefits scheme with extensive salary sacrifice schemes, including Health Cashplan, Dental, and Cycle to Work amongst others\nEnhanced sick pay\nEnhanced family friendly policies including enhanced maternity, paternity & shared parental leave\nWork Culture\n37hr working week, although hours may vary depending on role, job requirement or site-specific arrangements.\n Early 1.30pm finish Friday, start your weekend early!\nRemote, hybrid and site based working opportunities, dependant on your needs and the requirements of the role.\nUp to 5 paid days volunteering each year.\nFlexible working culture focused on output, with more formal flexible working arrangements on request (assessed subject to role) - please highlight any requests to the Talent Acquisition team.\nFunction: Engineering\nLocation: Harlow (Hybrid with 4 days a week on site)\nClearance: SC Eligible\nHours: 37 hours per week with early finish on Fridays\nAt RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.\nRaytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.\nSummary of Role:\nRaytheon’s ATMS (Air Traffic Management Systems) Software team is seeking talented, enthusiastic and innovative individuals that thrive within an Agile eco-system to deliver world class solutions that make the world a safer place. Become a part of something greater than yourself by bringing your best in collaboration with other motivated and talented individuals across a diverse set of backgrounds and skill sets.\nMain Duties:\nAs a Senior Software Engineer you will work within our existing software engineering team bringing your experience of real-time embedded software engineering to design, develop, integrate and test systems software to support our worldwide customer base. You will also have opportunity to work on exciting internal R&D projects to support the next generation of ATMS systems.\nThe main tasks of the role are:\nDesign and develop product functionality, user interfaces and performance improvements.\nKey contributor & reviewer at gate & design reviews.\nAct as Subject Matter Expert as part of a wider software and systems engineering group to analyse and resolve software and system defects in response to service requests, incidents, problems and events.\nValidating and verifying the design artefacts from internal teams or subcontractors.\nProvide input to configuration, safety and quality management as appropriate.\nDocument design and advise on product support material.\nInvestigate product issues and develop solutions to customer problems.\nDevelop test plans and methodologies to ensure product meets Raytheon quality standards.\nLead continuous technical improvement and re-architecting activities.\nAssist in updating software design artefacts.\nInterfacing with COTS vendors for technical support.\nProvide technical support (covering the entire software lifecycle) to Raytheon programmes delivering new capability.\nCandidate Requirements:\nEssential:\nRelevant years' active, hands-on software development experience, working in a Team environment\nRelevant years’ experience with C/C++/C# language\nExperience in the use of UML in software design and other methodologies\nReal-Time Embedded SW programming experience\nRTOS knowledge\nKnowledge of low-level communication protocols, Ethernet, Serial, PCI Bridge\nHands on fault investigation experience in embedded code environment\nUse of tools in software configuration management, requirements definition, high-level and detailed design, defect reporting\nDesirable:\nMin 2:1 degree in a computer science or related subject\nExperience Working in an Agile/SCRUM/DevOps delivery model.\nKnowledge of Radar systems.\nHands-on experience in reverse engineering a mature system to take advantage of a modern technology development in hardware, software and firmware.\nCompetency with design patterns and their application to solve complex problems.\nRTX adheres to the principles of equal employment. 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