{"id":733554,"url":"https://alion.io/job/sealingtech-senior-software-engineer","title":"Senior Software Engineer","company":{"id":692053,"name":"SealingTech","domain":"sealingtech.com","url":"https://alion.io/company/sealingtech-2","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Breezy","truth_index":null},"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":["Columbia, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":124000,"max_usd":230000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":3667},"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Alembic","optional":false},{"name":"ArgoCD","optional":false},{"name":"Bootstrap","optional":false},{"name":"CI/CD","optional":false},{"name":"Cypress","optional":false},{"name":"Django","optional":false},{"name":"Docker","optional":false},{"name":"FastAPI","optional":false},{"name":"Flask","optional":false},{"name":"Git","optional":false},{"name":"GitHub","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Jest","optional":false},{"name":"Jira","optional":false},{"name":"Linux","optional":false},{"name":"Playwright","optional":false},{"name":"Podman","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Pydantic","optional":false},{"name":"Python","optional":false},{"name":"React.js","optional":false},{"name":"Redux","optional":false},{"name":"SQLAlchemy","optional":false},{"name":"State Management","optional":false},{"name":"Tailwind CSS","optional":false},{"name":"TypeScript","optional":false},{"name":"Vitest","optional":false},{"name":"Vue.js","optional":false},{"name":"WebSockets","optional":false},{"name":"Ansible","optional":true},{"name":"Claude Code","optional":true},{"name":"Context Engineering","optional":true},{"name":"Copilot","optional":true},{"name":"ElasticSearch","optional":true},{"name":"Fedora","optional":true},{"name":"JavaScript","optional":true},{"name":"Kibana","optional":true},{"name":"Kubernetes","optional":true},{"name":"LLM","optional":true},{"name":"OpenSearch","optional":true},{"name":"Oracle","optional":true},{"name":"RAG","optional":true},{"name":"SIEM","optional":true},{"name":"Splunk","optional":true},{"name":"vLLM","optional":true}],"status":"live","first_seen_at":"2026-09-10T17:55:24Z","employer_posted_date":"2026-10-05","last_verified_at":"2026-10-29T17:51:16Z","board_verified":true,"closed_at":null,"days_open":49,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":49},"description":"Location: Columbia, MD\nType: Hybrid\nTravel: 10%\nAbout Us:\nSealing Technologies, a Parsons company, innovates and delivers high-performance deployable anywhere technologies that push what's possible at the edge, enabling organizations across the globe to solve complex challenges with speed and confidence. We design, engineer, and deliver products and deployable technologies built for environments where traditional infrastructure falls short.\nPosition Overview:\nSealingTech is looking for a talented and experienced Senior Software Engineer to join our dynamic team of engineers delivering cutting-edge solutions. You will take ownership of existing web products and continue active development across frontend, backend, and deployment workflows. You will own your technical approach and help shape the big picture.\nThis is an opportunity to work on real-world challenges, supporting mission-critical applications. Collaboration and innovation are crucial in this role, requiring a proactive approach to problem-solving and continuous learning. You will be stepping into a live codebase and be expected to ship features, maintain reliability, and handle production issues.\n\nDuties and Responsibilities:\nDesign and architect solutions for the Zepharis product suite and its existing integrations\nTroubleshoot and resolve issues across local, CI, and production environments.\nCo-lead day-to-day development of the Zepharis product suite; UI, API, and database layers; alongside senior engineering leadership.\nBuild new features as a full-stack engineer using Python, React, FastAPI, Pydantic, SQLAlchemy, and Postgres.\nArchitect database schema changes and plan migrations.\nDocument technical decisions to improve handoff and operational clarity.\nMentor junior/mid-level engineers and lead code reviews or design discussions.\nMinimum Qualifications:\nU.S. Citizenship.\n8+ years of software engineering experience.\nSME level experience in React or Vue, and TypeScript.\nExperience working with CSS frameworks and UI component libraries (e.g., Bootstrap, Tailwind CSS, BaseUI, etc.)\nExperience with frontend state management (e.g., TanStack Query, Redux) and component testing frameworks (e.g., Vitest, Jest, Cypress, or Playwright).\nSME level Python backend development with at least one web framework (e.g., FastAPI, Django, Flask).\nExperience with PostgreSQL, including Alembic migrations.\nExperience with Server-Sent Events or WebSockets for streaming updates.\nPractical experience with Docker/Podman and compose-based development.\nExperience with Git/GitHub, CI/CD pipelines (e.g., GitHub Actions, Argo CD), and Agile workflows (Jira).\nBuilt and shipped enterprise web applications.\nStrong written and verbal communication skills, with the ability to document and maintain engineering processes and procedures.\nBachelor's degree in Engineering, Computer Science, Information Technology, or related field; equivalent experience will be considered.\nComfortable working in a Linux development environment.\n\n Preferred Qualifications:\nRAG and LLM Context Engineering solution architecture experience\nExperience with LLM inference engines such as vLLM\nExperience using AI coding assistants (e.g., Claude Code, GitHub Copilot) to accelerate feature development, refactoring, and test creation.\nComfortable integrating AI-assisted workflows into test automation and QA processes to improve coverage and catch regressions.\nExperience with Fedora-based Linux distributions (RHEL, Rocky, Oracle).\nExperience with Ansible-based deployment workflows.\nExperience with cyber tooling and ecosystems (e.g., Elasticsearch/Opensearch, Kibana, Splunk, or similar SIEM/log-analytics platforms)\nExperience supporting Defensive Cyber Operations within Service Cyber Command elements or other U.S. Government organizations.\nSealing Technologies is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, veteran status or any other protected status. Working is no longer solely about the job. Here at Sealing Tech, we understand your happiness and health is vital to our success. We are innovative in our approach to cultivating balanced work environments and offer a plethora of added perks. Sealing Tech offers competitive compensation packages, health, dental, and vision insurance, retirement contributions, continuing education budgets, tuition reimbursement, flexible schedules, and generous vacation policies. Other perks include complimentary snacks, drinks & monthly catered lunches, and company retreats and gatherings. Plus, flexible work arrangements, pet friendly offices and quarterly merit bonuses for qualified employees. We are looking for a new member to join our team, take on challenges, be innovative and willing to grow with us. 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