About the RoleWe're hiring a
Senior Full Stack Software Engineer to design, build, and scale modern web applications end-to-end. You'll work across frontend UI, backend services, APIs, asynchronous processing, and data layers-shipping features that are reliable, secure, and built to last.
This is a senior individual contributor role with real autonomy and real impact. You'll have end-to-end ownership of features and meaningful input into technical decisions, quality standards, and delivery practices working in a remote-first environment.
Core Tech Stack: - Frontend: React 19, TypeScript, Vite-based React apps, Tailwind CSS, SignalR
- Backend: .NET 9 (C#), Minimal APIs, Entity Framework Core
- Async Processing: RabbitMQ, Redis (for scale-out and caching)
- Data and Storage: PostgreSQL, Amazon S3
What You'll Do - Shape the product architecture end-to-end. You'll design and ship modular .NET services and modern React frontends that stay fast, reliable, and elegant across a wide range of real-world customer environments.
- Own the data foundation. You'll design high-performance PostgreSQL schemas and craft EF Core queries that serve as the source of truth for business logic, permissions, and RBAC-balancing correctness, clarity, and scale.
- Engineer for performance at scale. You'll build smart caching layers with Redis and leverage S3 for large artifacts, keeping our Web Gateway lean, responsive, and built to grow.
- Drive technical direction through RFCs. You'll author and collaborate on design proposals that define data contracts and API boundaries, making our .NET platform and Python-based solver runners work together seamlessly.
- Ship with product and design, not in a silo. You'll partner closely with product and design to turn real customer problems into thoughtful technical solutions-and deliver them in tight, iterative releases.
- Use AI as a force multiplier (responsibly). You'll leverage tools like Claude Code and GitHub Copilot/Cursor to move faster and refactor with confidence, while keeping security, quality, and maintainability non-negotiable.
- Hold the quality bar high. You'll help set the standard through great code reviews, automated testing, and pragmatic engineering practices that keep the codebase a joy to work in.
What We're Looking For (Required) - Production experience with hash-chained audit, Merkle-tree sealing, and cross-language evidence parity (C# + Python)
- Depth in cryptographic evidence pipelines - HMAC integrity, signed checkpoints, chain continuity verification
- Fluency in PostgreSQL transactional guarantees for audit writes, advisory-lock coordination patterns
- Prior work on ATO-evidence-bearing audit implementations (DoD, fintech regulatory audit, HIPAA-equivalent scale)
- Ability to architect AWS KMS integration with envelope encryption; HSM (PKCS#11) integration familiarity
Nice to Have (Preferred) - Prior DoD / federal ATO submission experience
- NIST SP 800-53 AU family control implementation experience
- Prior DoD ATO experience on CDS integrations, familiarity with Radiant Mercury / ISSE Guard / EverFox / Forcepoint WebShield, knowledge of the ISSE approval workflow.
Other Qualifications - Analytical Aptitude: Possess keen analytical and problem-solving skills, coupled with the capability to understand complex software challenges and collaborate toward viable solutions.
- Effective Communication: Skilled in distilling technical complexities into comprehensible terms for varied audiences.
- Adaptive Nature: Resilience and adaptability in the face of an ever-changing tech landscape, with a knack for rapidly integrating new technologies and methodologies.
- Agile Methodology Experience: An understanding and hands-on experience with agile development methodologies and version control tools.
- Agility in Tech: Demonstrated adaptability in the fast-paced tech landscape, continually embracing and integrating new technologies and methodologies.
- Education: While formal education in Computer Science or related fields is a plus, DefconAI values hands-on experience and demonstrable skills above all. Candidates with 6+ years of relevant experience will be considered regardless of their academic pedigree.
- Continuous Learner: A commitment to perpetually update one's skill set, staying aligned with the latest in technology trends and best practices.
What We Offer: - A fully remote, results-based environment
- Competitive salary, bonus, and equity package
- 100% employer paid, comprehensive health insurance including medical, dental, and vision for you and your family
- Unlimited PTO, with your manager's approval
- Flexible work environment where you manage your work day
- 14 weeks of fully-paid parental leave
Salary range: $155,000-$215,000. This represents the typical salary range for this position based on experience, skills, and other factors.
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Our Red Cell Partners Benefits:For full-time roles
- Career track opportunity with potential for rapid advancement with strong performance as the firm grows
- 100% employer paid, comprehensive health care including medical, dental, and vision for you and your family.
- Paid maternity and paternity for 14 weeks at employees' normal pay.
- Unlimited PTO, with management approval.
- Opportunities for professional development and continued learning.
- Optional 401K, FSA, and equity incentives available.
- Mental health benefits are available through Tara Mind.
- Cost effective GLP-1 solutions available through Crux.
