Senior Fullstack Developer (Backend)

Lyntris is a defense technology company that connects sensing to action across the connected battlespace. Lyntris brings together the talents of Accelint and Vitesse teams under one mission, with each contributing deep expertise within their domain. Combining differentiated hardware, software and mission expertise, Lyntris helps customers sense threats, make sense of complex conditions and act with greater speed, precision and confidence in contested environments.

Lyntris supports U.S. and allied defense organizations across every branch — including Navy, Army, Air Force, Space Force and allied partners — spanning strategic, operational and tactical missions and every domain: Space, Air, Land, Sea and Cyber. With more than 200 active defense programs, Lyntris works at every level of the mission, from national command authority to the tactical edge.

Solutions are designed by operators who understand the mission, engineered for the conditions that degrade or defeat standard systems, and built on an open, modular architecture that integrates into existing programs without requiring them to start over. Lyntris moves faster than the traditional defense cycle — with integrated design, build and test capabilities in-house — and delivers systems that sustain and endure long after initial fielding.

We are seeking a backend-leaning Full-Stack Engineer to build and integrate concept capabilities for an Uncrewed Surface Vessel (USV) autonomy and mission software platform. This role is centered on Python networking, backend service development, real-time data movement, distributed systems integration, and C++ interfaces/components. Frontend experience, especially with Svelte/SvelteKit, is a plus, but it is not the primary focus of the position. 

You will work on the software and networking backbone behind operator-facing capabilities: telemetry transport, service-to-service communication, simulation integration, protocol adapters, message pipelines, and vessel-adjacent interfaces. The ideal candidate is comfortable moving between backend application code, networking behavior, containerized deployments, and lower-level integration work. 

Duties & Responsibilities:

USV Concept Delivery & Integration 

• Deliver integrated concept demonstrations for USV workflows such as mission execution monitoring, route execution support, vehicle health/status, operator oversight, and simulation-backed demonstrations. 

• Connect backend services to simulation, replay, and vessel-adjacent systems so concepts reflect realistic telemetry cadence, state transitions, faults, and mission events. 

• Support end-to-end integration across services, data streams, and mission software components. 

Backend Engineering (Python / Networking / Distributed Systems) 

• Develop Python services, adapters, and tooling to support concept development, data translation, automation, replay, and simulation hooks. 

• Implement and maintain real-time interfaces such as REST APIs, WebSockets, TCP/UDP communication paths, streaming pipelines, and pub/sub patterns. 

• Design and troubleshoot inter-service communication, connection management, reconnection behavior, message routing, and high-rate telemetry handling. 

• Work within distributed architectures common to autonomy stacks, including Redis or Valkey, DDS, pub/sub buses, and other message-oriented systems. 

• Diagnose backend and networking issues such as service discovery failures, QoS/config mismatches, dropped connections, environment drift, and runtime logging problems. 

C++ & Lower-Level Integration 

• Contribute to or interface with C++ components where performance, hardware interaction, protocol handling, or existing subsystem integration requires it. 

• Work across mixed-language systems where Python services integrate with C++ libraries, binaries, or networked components. 

• Assist with protocol and device integration efforts relevant to autonomy or vehicle systems. 

Frontend & Full-Stack Support 

• Support frontend or operator-facing application work as needed, including integration with existing web interfaces. 

• Svelte or