Senior Full Stack Software Engineer

Red Cell Partners is an incubation firm building and investing in rapidly scalable technology-led companies. They are seeking a Senior Full Stack Software Engineer to design, build, and scale modern web applications, overseeing the entire development process from frontend to backend services.

Responsibilities:

• 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

Requirements:

• 8+ years of professional software engineering experience delivering production web applications
• Strong full stack experience shipping user-facing features end-to-end across frontend, backend, and data layers
• Deep expertise in React and TypeScript, including component architecture, hooks, and performance optimization
• Experience building and maintaining modern React applications (Vite, Tailwind CSS and client-side data fetching patterns)
• Strong backend experience with C# and modern .NET (.NET 9 or similar), including API design with Minimal APIs and secure development practices
• Strong experience with PostgreSQL, including schema design, indexing strategies, and query optimization
• Hands-on experience with Entity Framework Core, including writing efficient queries and managing migrations
• Experience designing and operating asynchronous workflows (RabbitMQ) and implementing caching strategies (Redis)
• Experience building real-time UI updates using SignalR
• Experience working with AWS, especially object storage in Amazon S3
• Solid understanding of authentication or authorization patterns including application-level RBAC (e.g., JWT, OAuth/OIDC concepts)
• Strong written and verbal communication skills, including the ability to collaborate effectively in a remote environment
• Experience integrating .NET services with Python-based systems and designing stable data contracts between services or teams
• Experience with Docker and container orchestration (Kubernetes)
• Observability and performance tooling experience (OpenTelemetry, Application Insights, Datadog, Grafana/Prometheus)
• GraphQL experience (in addition to REST)
• 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