Full Stack Engineer (.NET + Front-End)

TThe Full Stack Engineer ships features end-to-end across the .NET backbone, the React surfaces, and the operator workflows on top of Lena. You'll move across the stack daily. What you'll work on

• Designing and shipping .NET 6+ backend services that mediate between AI reasoning, device adapters, and operator surfaces.
• Building React surfaces that present Lena's signal - including uncertainty shape, not just confidence numbers.
• Owning the REST API design between backend and frontend (and Lena's Python services).
• Driving operator UX decisions in partnership with product, with attention to the workflows operators run dozens of times a day.

Do you have experience in UI development?, * You have 5+ years of .NET / C# backend experience, with hands-on production work in .NET 6 or newer.

• You have 3+ years of React (or comparable modern framework) experience.
• You've shipped end-to-end features that touched both backend and frontend in the same project.
• You've designed and shipped production REST APIs in a distributed SaaS environment.
• You have hands-on production experience with AWS (preferred), Azure, or GCP.

You probably aren't a fit if

• You're a backend-only engineer who treats the UI as someone else's problem.
• You're a frontend-only engineer who treats the API as a given.
• You haven't worked in environments where AI changes the contract between layers.., Must-have
• Strong backend engineering experience in .NET / C#, with hands-on production work in modern .NET (6+, not legacy Framework only).
• Frontend development experience with modern React (or comparable framework such as Next.js, Vue, or Svelte).
• API design experience for distributed SaaS systems; you have designed and shipped production REST APIs.
• Cloud-native application development with AWS preferred (Azure or GCP also welcome).
• Strong debugging and systems thinking.

Strong signal

• Real-time systems or orchestration platform experience.
• Enterprise SaaS architecture familiarity.
• Exposure to AI-integrated applications (you do not need to be the AI engineer, but you should be comfortable working alongside one).
• Startup or scale-up environment experience.
• Observability and operational tooling familiarity.

We are growth-stage and fully remote, not late-stage. We invest in the work, the tools, and the people, not the manifesto.

What that looks like in practice:

• Flexible / unlimited time off
• Health insurance
• Equity participation, discussed at offer
• Fully remote
• Architectural ownership of work that ships to real enterprise customers
• Direct working relationships with the people setting platform strategy
• A growth-stage platform where the decisions you make in your first year shape the product for years
• AI-assisted tooling licensed by NetSpeek (Cursor, Claude Code, GitHub Copilot, or comparable)