Lead Full-Stack / Unity Architect (Future Team Lead – US)

**Location:** Remote (US\-based) **Type:** Full\-time **Experience:** 10\+ years **About the Role** We’re looking for a **senior, hands\-on engineer** who can **build independently today** and **lead a team tomorrow**. This role starts as a **solo, high\-ownership position**, where you will take full responsibility for critical parts of our system. Within 6–12 months, you are expected to **hire, lead, and scale a team of 4–10 engineers**. You’ll work closely with leadership in Israel while operating autonomously in the US. **About the Product** Althimis is building a **real\-time, large\-scale training 3D platform and simulation** combining: * MMO\-scale collaboration * **Physical simulations** * **AI\-driven systems** * Browser\-based (WebGL) real\-time environments Our focus is on **performance, scalability, and real\-world simulation accuracy**, targeting enterprise, defense, and advanced training use cases. **What You’ll Do** **Phase 1 – Hands\-On (Initial Months)** * Own and develop **core systems end\-to\-end** (Unity \+ backend) * Build **real\-time, scalable systems** supporting thousands of users * Work across: * Unity (client, simulation, rendering) * Backend services (APIs, real\-time communication, infra) * Solve **performance, networking, and system design challenges** **Phase 2 – Leadership (Within 12 Months)** * Build and lead a team of **4–10 engineers** * Define architecture, standards, and processes * Own planning, delivery, and technical direction * Mentor engineers while staying technically involved **What We’re Looking For** **Core Requirements** * **10\+ years of software engineering experience** * Strong **C\# expertise** * Deep experience with **Unity (real\-time / multiplayer / simulation)** * Proven experience building **production backend systems** * Strong **system design and architecture skills** * Experience working across **frontend \+ backend systems** **Leadership Experience** * Prior experience leading teams (**at least 4 engineers**) * Still **hands\-on recently** (not purely managerial) * Experience owning projects end\-to\-end * Ability to scale into a **team of 4\-10 within a year** **Technical Strength** * Experience with: * Real\-time systems (WebSockets, WebRTC, multiplayer frameworks) * Scalable backend architecture (APIs, async systems, caching) * Observability (logs, metrics, tracing) * Strong understanding of: * Clean architecture (DI, modular systems) * Performance optimization (CPU, GPU, memory, bandwidth) **Math \& Simulation** * Strong **mathematical thinking** * Experience or familiarity with: * **Physical simulations** * Real\-time systems requiring numerical accuracy * Ability to reason about performance and correctness from first principles **Nice to Have** * Experience with Photon, SignalR, or similar * Experience building physical Simulation * Experience creating training / learning applications * Background in **AI systems or data pipelines** * Experience in **defen