Firmware Engineer

ACS (Allen Control Systems) is a defense technology company building precision robotic systems for the United States and its allies. Founded by two former U.S. Navy electrical engineers with deep experience in robotics and software, ACS brings together AI, computer vision, precision motion, and advanced hardware to solve complex defense challenges across land, air, and maritime environments.

Our flagship product, Bullfrog, is an autonomous precision weapon system that transforms existing weapons into highly accurate counter-drone systems — giving warfighters a scalable, cost-effective response to one of the fastest-growing threats on the modern battlefield. Bullfrog is deployed with U.S. forces, and ACS works with organizations throughout the U.S. military and national security community.

Following a $200 million Series B at a $2.2 billion valuation, ACS is rapidly expanding manufacturing, accelerating Bullfrog deployments, and developing the next generation of autonomous battlefield systems. This is an opportunity to join a proven, fast-moving team and help scale technology with direct, real-world impact on national security.

ACS is headquartered in Austin, Texas, with additional operations in Alexandria, Virginia;
Mountain View, California; and Huntsville, Alabama. For more information,

Allen Control Systems (ACS) is a cutting-edge defense startup founded by two former Navy electrical engineers with a proven track record in robotics and software. We are developing an autonomous gun turret using advanced computer vision and control systems to precisely detect, track, and neutralize enemy drones.

With an engineering-first culture, ACS values technical excellence and innovation. Backed by our founders’ successful exits from two previous ventures acquired for a combined $180M in 2022, we are committed to ensuring that the groundbreaking technologies we develop will have a real-world impact.

We are looking for a Firmware Engineer to own the low-level embedded software that runs our autonomous aircraft in the field. This is a deep individual contributor role for someone with 4+ years of industry experience who can operate at the architecture and design level from day one. You will make real decisions about bare-metal versus RTOS tradeoffs, sensor and peripheral integration, deployment strategies for fielded aircraft, and the HIL testing infrastructure that validates it all.

You are expected to document and justify those decisions with the same rigor you apply to the code itself.

• Own the architecture and implementation of time- and safety-critical embedded firmware on STM
  32-based platforms; evaluate existing firmware ecosystems and make well-reasoned decisions about what to carry forward versus redesign from scratch.

• Write drivers for sensors and peripherals; select and configure communication protocols including CAN, I2C, UART, and Ethernet appropriate to each use case.

• Determine and implement deployment strategies for fielded aircraft, including boot loader design and over-the-air or field update approaches.

• Set up and maintain hardware-in-the-loop testing infrastructure; produce thorough design documentation that captures architectural decisions, protocol selections, and tradeoffs clearly enough to stand on their own.

• 4+ years of industry experience in embedded firmware development; fluency in C and C++ is required.

• Deep understanding of bare-metal and RTOS embedded architectures; strong working knowledge of embedded communication protocols including CAN, I2C, UART, and Ethernet and the ability to select the right tool for each application.

• Solid experience with boot loader design and firmware deployment for fielded systems; experience…