Full Stack Engineer (.NET + Front-End)

Job Description

Full Stack Engineer (.NET + Front-End) — NetSpeek

NetSpeek is the agentic control plane for enterprise physical infrastructure. We govern how AI agents reason about, decide on, and execute actions across enterprise endpoints. Our reasoning and execution layer — Lena — sits in customer production environments, where reliability, observability, and auditability are non-negotiable.

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.

You're a fit if

• 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..

How to apply

Run the Operator UX for this role, then submit your structured response with the application. Or take the Field Note path as a single essay question instead.

Either path is read by a human on our hiring team. No AI scoring, no auto-rejection.

Read the Engineering Handbook and How We Evaluate before applying.

After an offer

We run standard pre-employment checks before your start date: identity verification, right-to-work confirmation, employment verification, and (where lawful and role-relevant) a criminal record check. We don't run credit checks or online reputation scoring.

Requirements

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.

Benefits

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)