{"id":144140,"url":"https://alion.io/job/nextgen-federal-systems-senior-software-engineer-2","title":"Senior Software Engineer","company":{"id":7117,"name":"NextGen Federal Systems","domain":"nextgenfs.com","url":"https://alion.io/company/nextgenfs","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":85,"open_postings":15,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":55,"computed_at":"2026-10-28T05:59:10Z"}},"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":["Colorado Springs, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":122000,"max_usd":226000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":3667},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Flask","optional":false},{"name":"Python","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"STK","optional":false},{"name":"Docker","optional":true},{"name":"Git","optional":true},{"name":"JavaScript","optional":true},{"name":"MBSE","optional":true}],"status":"live","first_seen_at":"2026-05-14T16:58:22Z","employer_posted_date":"2026-05-14","last_verified_at":"2026-10-28T02:36:24Z","board_verified":true,"closed_at":null,"days_open":166,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":166},"description":"NextGen Federal Systems, LLCis seeking a Software Engineer with experience in Systems Tool Kit (STK) to support the development and integration of mission analysis and modeling applications. These applications enable multi-domain analysis-including air, space, ground, and maritime systems-by leveraging physics-based modeling and simulation to assess system performance, coverage, communications, and operational effectiveness.\nResponsibilities include software development, configuration, and execution; result interpretation; documentation; and modification and maintenance of tools and code. The selected candidate must be quick to learn, adaptable, and agile, interfacing directly with end-customers and customer leadership. The software engineer will provide a full range of systems and software engineering to support critical mission analyses.\nResponsibilities\nDevelop, customize, and maintain STK-based applications to support mission planning, analysis, and visualization \nIntegrate STK (Engine, Components, or Desktop) with external tools, models, and data sources to enable end-to-end mission workflows \nImplement backend services using Python and support frontend interfaces as needed \nAnalyze and interpret simulation results, providing actionable insights to engineering teams and stakeholders \nSupport traceability between mission analysis outputs and system models, ensuring consistency across the digital engineering environment \nSupport deployment and execution of applications in modern environments (e.g., containerized or cloud-based) \nContribute to documentation, user guides, and technical deliverables \nTroubleshoot and enhance existing tools to improve performance, usability, and scalability \nQualifications\nBS or equivalent in Computer Science, Engineering, Mathematics, or equivalent technical degree\n5+ years’ prior work experience in the aerospace or defense industry, with demonstrated software development experience\nExperience customizing or automating STK-based tools or applications highly desired (including STK, STK Engine, STK Components, and/or Cesium)\nExperience integrating tools via APIs (REST or similar) \nProficiency in Python and experience with backend frameworks such as Flask is required\nStrong expertise in React JS for building modern and responsive user interfaces is highly desirable\nKnowledge of version control systems, preferably Git is highly desirable\nProven experience as a Full Stack Developer or similar role is highly desirable\nCapable of self-management and responsibly executing multiple tasks in accordance with priorities and deadlines\nActive Top Secret (TS) clearance required (SCI eligibility preferred) \nPreferred Qualifications\nExperience with STK Engine, STK Components, or Cesium \nExperience linking STK analyses to MBSE environments (e.g., parameter passing, trade studies, digital thread integration) \nFamiliarity with digital engineering ecosystems, mission thread development, or model orchestration tools \nExperience with Docker, cloud environments, or DevSecOps practices \nFrontend development experience (e.g., React)","description_format":"text","description_chars":3096,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["National Security","Custom Software Development"],"lifecycle":[{"event":"open","at":"2026-05-14T16:58:22Z"}],"visa":[],"liveness":{"score":10,"band":"cold","label":"Long shot","p_open":1,"p_active":0.366,"p_room":0.28,"age_days":166,"expected_fill_days":55,"reasons":["conf:3","stale_co","win:tail","crowd:"],"computed_at":"2026-10-28T05:59:10Z"},"pay":null,"html_url":"https://alion.io/job/nextgen-federal-systems-senior-software-engineer-2","json_url":"https://alion.io/job/nextgen-federal-systems-senior-software-engineer-2.json","meta":{"generated_at":"2026-10-28T07:28:35Z","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":9588,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"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":7117},"rest":"https://alion.io/mcp/rest/get_company?id=7117"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fnextgen-federal-systems-senior-software-engineer-2"},{"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%2Fnextgen-federal-systems-senior-software-engineer-2"},{"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%2Fnextgen-federal-systems-senior-software-engineer-2"},{"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/nextgen-federal-systems-senior-software-engineer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fnextgen-federal-systems-senior-software-engineer-2"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":144140}},{"tool":"search_jobs","arguments":{"company":"nextgenfs.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":144140},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. Docs: https://alion.io/developers"}}