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Systems Software Engineer

Majestic Labs
Los Altos, CA

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Job Details

Qualifications

Software engineering
System design
Build automation
System design for system development
Collaboration with product development teams
C
Assembly language
Simulation systems
Hardware diagnostics
Debugging
Cross-functional communication

Full Job Description

About us:

At Majestic, we’re re-architecting systems for the future of AI. We’re on a mission to make AI ubiquitous by leveraging groundbreaking technologies. If you’re passionate about deep tech and full stack AI, this is a chance to join our world-class team shaping the future of AI.

Role Description:

We’re looking for a systems software engineer to work on the lowest layers of that stack: the runtime, firmware, and device software that sit between high-level AI workloads and custom accelerator hardware. You’ll help build the software responsible for device bring-up, kernel dispatch, memory mapping, queueing, synchronization, performance monitoring, and debug infrastructure.

This is not a conventional embedded firmware role. The work spans firmware, operating-system interfaces, simulator bring-up, accelerator runtime design, hardware/software contracts, and performance-critical execution paths.

What You’ll Do

Own critical boot and runtime contracts: firmware image layout, configuration, core release, liveness detection, shared queues, command/completion formats, memory mappings, and versioned ABIs.
Build and optimize low-latency communication paths between host runtime software and accelerator cores, including submission/completion queues, doorbells, interrupts, polling paths, and synchronization mechanisms.
Work with custom processor cores, multi-core coordination, traps/exceptions, page tables, protection mechanisms, MMIO, DMA, and accelerator memory hierarchies.
Develop observability and debug infrastructure for a complex distributed accelerator system, including boot metrics, hardware counters, trace capture, performance monitoring, debug paths, and failure diagnosis for hung or slow jobs.
Help shape the production device software architecture: the boundary between kernel-mode components, userspace runtime libraries, simulator backends, and hardware-native backends.
Collaborate closely with hardware architects, compiler/runtime engineers, kernel developers, and performance engineers to define the software/hardware contracts for future chips.
Debug issues that cross abstraction layers: AI graph execution, runtime scheduling, device queues, firmware, memory translation, interrupts, simulator behavior, and hardware state.

Requirements:

What We’re Looking For

5+ years of experience building low-level systems software, firmware, runtimes, operating systems, device drivers, or accelerator software.
Strong C programming skills and comfort reading or writing assembly where needed.
Deep understanding of computer architecture fundamentals: CPU privilege modes, virtual memory, interrupts, atomics, caches, memory ordering, MMIO, DMA, and performance counters.
Experience with one or more of: processor firmware, ARM or RISC-V systems software, Linux kernel drivers, bare-metal firmware, bootloaders, hypervisors, RTOS internals, or accelerator runtimes.
Ability to design and maintain stable binary interfaces and versioned contracts between independently evolving software components.
Strong debugging instincts across hardware/software boundaries, including cases where the only available evidence is a memory dump, trace buffer, hardware counter, queue state, or simulator log.
Comfortable working in a fast-moving environment where simulators, firmware, drivers, runtime libraries, and hardware specs are evolving together.
Excellent communication skills and the ability to collaborate across hardware, compiler, runtime, and product teams.

Especially Relevant Experience

Experience with custom accelerators, GPUs, NPUs, SmartNICs, DPUs, or other complex SoCs.
Low-level firmware experience, especially privilege modes, control/status registers, traps, memory protection, virtual memory, multi-core boot, or hardware debug support.
Linux driver or userspace driver/runtime experience, including ioctl/mmap APIs, DMA, IRQ handling, polling vs interrupt tradeoffs, and zero-copy paths.
Experience with hardware trace and performance infrastructure such as ARM CoreSight, ETM/ETF/ETR, ATB funnels, hardware PMUs, trace encoders, or similar SoC observability systems.
Experience designing queue protocols, command buffers, completion queues, doorbells, synchronization objects, or low-latency producer/consumer systems.
Experience with simulator and silicon bring-up: QEMU, virtual platforms, SystemC, RTL simulation, FPGA/prototyping, or first-silicon debug.
Experience with modern build systems such Bazel, cross-compilation, freestanding toolchains, linker scripts, and hermetic build systems in general.

Why Join Majestic?

You’ll work on the software foundation for a new AI computing platform, at the layer where architecture decisions become real system behavior.
Your work will directly affect boot time, runtime performance, performance visibility, debuggability, and the programming model exposed to higher-level AI software.
You’ll collaborate with a small, highly technical team across hardware, systems, compilers, and AI runtime software, with room to define major pieces of the stack from first principles.

Quick Apply

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