{"id":1426924,"url":"https://alion.io/job/twenty-senior-backend-software-engineer-2","title":"Senior Backend Software Engineer","company":{"id":685785,"name":"Twenty","domain":"twenty.io","url":"https://alion.io/company/twenty-2","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":83,"open_postings":22,"ghost_share":0,"stale_share":0.682,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-09-29T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Arlington, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":159000,"max":263000,"currency":"USD","period":"year","gross":null,"usd_annual":263000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon Neptune","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Go","optional":false},{"name":"GraphQL","optional":false},{"name":"NATS","optional":false},{"name":"Neo4j","optional":false},{"name":"Rest API","optional":false}],"status":"live","first_seen_at":"2026-09-28T17:34:49Z","employer_posted_date":"2026-09-28","last_verified_at":"2026-09-30T02:42:28Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"About the Company\nAmerica is under sustained cyber attack. Our adversaries infiltrate our networks, steal our IP, and degrade the digital infrastructure that modern life runs on. They’ve learned-correctly-that those attacks rarely produce consequences.\nTwenty was founded to change that, by making our adversaries think twice before they attack us. Our vision is American and allied primacy in cyberspace-a future where they cannot contest us, deterrence is assured, and the free world remains secure.\nFounded in 2024, Twenty Technologies (www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies. Headquartered in Arlington, Virginia, Twenty has raised $168M from Khosla Ventures, Accel, Caffeinated Capital, Friends & Family Capital, Point72 Ventures, General Catalyst, and In-Q-Tel.\nMission | On Site | Full Time | U.S. Citizenship Required / No Active Clearance Required\nRole Summary\nYou’ll build the backend systems that power Twenty’s cyber and electromagnetic capabilities-software that ingests real-time operational signals, models complex relationships, and serves high-throughput APIs at machine speed. You’ll design and ship reliable services in Go, working with known-hard problems like graph data modeling, event-driven architectures, and performance at scale. You’ll partner closely with product, frontend, and domain experts to turn operator needs into durable platform capabilities. This role spans both cloud and on-premises environments supporting mission-critical U.S. national security outcomes.\nWhat You’ll Do\nDesign and implement scalable backend services in Go that improve operator decision-making and response.\n\nBuild high-performance APIs that power customer-facing workflows and internal platform capabilities.\n\nModel complex relationships in graph databases and optimize schemas and queries for speed and clarity.\n\nImplement event-driven systems (e.g., with NATS) to process real-time operational data streams.\n\nDevelop and maintain automated tests to protect correctness, security, and performance as the system evolves.\n\nBuild and operate microservices deployed on AWS, with an eye toward resilience and cost-aware scaling.\n\nCreate and improve CI/CD pipelines that enable fast, secure delivery of new capabilities.\n\nPartner with cyber operations experts to translate domain needs into robust product features.\n\nCollaborate with frontend engineers on API contracts and data structures that are efficient and usable.\n\nEvaluate new technologies and patterns that could unlock better operational outcomes.\n\nWho You Are\nYou care about building systems that have real-world impact, especially in national security and defense of democracies.\n\nYou’re excited by hard backend problems: throughput, latency, correctness, and operability under pressure.\n\nYou take pride in clean interfaces-APIs that are intuitive, consistent, and built to evolve.\n\nYou think in systems: data models, services, and workflows that work together reliably.\n\nYou’re pragmatic and iterative-ship value quickly, then harden, measure, and improve.\n\nYou collaborate well across disciplines, communicate clearly, and welcome direct feedback.\n\nYou default to ownership: you notice gaps, propose solutions, and drive them to completion.\n\nMust Have\nYou have 5+ years of professional software development experience building backend (or full-stack) applications.\n\nYou have strong proficiency with Go (Golang) and have shipped production services with it.\n\nYou have experience working with graph databases (Neo4j, AWS Neptune, or similar), including schema design and query performance.\n\nYou have working knowledge of event-driven architectures and message queues/streaming systems.\n\nYou have experience building and maintaining APIs (REST and/or GraphQL).\n\nYou have experience with cloud infrastructure, ideally AWS, and understand cloud-native deployment patterns.\n\nYou have hands-on experience with containerization and microservices architectures.\n\nYou have a strong foundation in secure coding practices and can reason about security tradeoffs.\n\nYou have a bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience.\n\nNice to Have\nYou’ve delivered software in defense, security, or other mission-critical environments.\n\nYou’ve built systems for analysts, operators, or high-tempo users where speed and reliability matter.\n\nYou’ve integrated AI/ML capabilities into production systems (inference, pipelines, or tooling).\n\nYou have experience with large-scale data processing and analytics workloads.\n\nYou’ve contributed meaningfully to open-source projects.\n\nYou’ve used observability tooling (metrics, tracing, logging) to debug and improve production systems.\n\nTech Environment (You Might Work With)\nGo (Golang), GraphQL/REST\n\nGraph databases (Neo4j, AWS Neptune) and complex graph schemas\n\nNATS and event-driven architectures\n\nAWS, microservices, containers\n\nCI/CD pipelines, automated testing frameworks, infrastructure-as-code patterns\n\nMonitoring and observability tools\n\nBenefits\nWhat's on the table:\nHealth. Medical, dental, and vision plan options. Life / AD&D, disability coverage options.\n\nFamily. Paid parental leave for eligible full-time employees. 12 weeks for birthing parents, 4 for non-birthing parents, 6 weeks for adoptive, foster, or intended parents through surrogacy.\n\nVacation. Paid holidays and flexible PTO. Take what you need.\n\nRetirement. 401(k) with pre-tax and Roth options. HSA/FSA options, dependent care FSA.\n\nBenefits vary by location, role, and eligibility. Full plan details provided during the interview and offer process.\nIf this role sounds like you, apply and share with us your interest\nDue to U.S. government contract and security requirements, this role is limited to U.S. citizens. Some positions may also require eligibility to obtain and maintain a U.S. Government security clearance. Any active clearance requirement will be listed in the role description.\nTwenty is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, veteran status, disability, or any other protected status, consistent with applicable law.\nIf you need a reasonable accommodation during the hiring process, let us know and we will work with you.","description_format":"text","description_chars":6360,"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":false,"languages":[]},"benefits":["Parental leave"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Military","Cyber Warfare"],"lifecycle":[{"event":"open","at":"2026-09-29T00:02:27Z"}],"liveness":{"score":60,"band":"ok","label":"Likely open","p_open":1,"p_active":0.602,"p_room":1,"age_days":0,"expected_fill_days":40,"reasons":["conf:2","stale_co","win:early"],"computed_at":"2026-09-29T05:45:00Z"},"pay":{"stated_usd_annual":263000,"is_top_pay":true},"html_url":"https://alion.io/job/twenty-senior-backend-software-engineer-2","json_url":"https://alion.io/job/twenty-senior-backend-software-engineer-2.json","meta":{"generated_at":"2026-09-30T04:12:24Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":2853,"day_limit":5000,"remaining_today":2147,"minute_limit":60,"resets_at":"2026-10-01T00:00:00Z"}}}