Compiler Engineer-LLVM Backend

DensityAI, Inc.; Mountain View (CA); On-site; USD 240,000 - 295,000; Full time

Benefits offered by this job

Equity grant

Medical/dental/vision

401(k)

Paid time off

Job summary

DensityAI, Inc. seeks an LLVM backend engineer to own backend development for our custom accelerator ISA, covering instruction selection, register allocation, scheduling, and linker support.

You will collaborate with chip-design and software teams from first silicon through scale-out in Mountain View, California. The role demands 5+ years of compiler engineering, hands-on LLVM target development, strong ISA design knowledge, and the ability to diagnose regressions.

Qualifications

• 5+ years of compiler engineering experience with hands-on LLVM target development.
• Strong understanding of computer architecture and ISA design.
• Ability to debug correctness and performance regressions across the full compilation flow.

Responsibilities

• Own LLVM backend development for our custom accelerator ISA — instruction selection, register allocation, scheduling, and linker support across scalar, vector, and floating-point pipelines.
• Use and develop AI-assisted tool flows to accelerate compiler development and performance tuning.

Skills

LLVM backend

Compiler engineering

ISA design

TableGen

Tools

MLIR

Job description

About The Role

Own LLVM backend development for our custom accelerator ISA — instruction selection, register allocation, scheduling, and linker support across scalar, vector, and floating-point pipelines. Work with chip-design and software teams driving DensityAI's AI accelerator program from first silicon through scale-out.

What you'll do

• Own LLVM backend development for our custom accelerator ISA — instruction selection, register allocation, scheduling, and linker support across scalar, vector, and floating-point pipelines
• Use and develop AI-assisted tool flows to accelerate compiler development and performance tuning

What we're looking for

• Exceptional abilities in LLVM backend internals (TableGen, instruction selection, scheduling, register allocation)
• 5+ years of compiler engineering experience, with hands-on LLVM target development
• Strong understanding of computer architecture, ISA design, and compiler-hardware co-design
• Ability to debug correctness and performance regressions across the full compilation flow
• (Optional) Custom-ISA bring-up, MLIR experience, GPU / accelerator backends, or linker / loader work

Compensation

Final offers depend on level, location, and skills relevant to the role. Additional compensation: equity grant per company guidelines; medical / dental / vision; 401(k); standard PTO.

Full compensation packages are based on candidate experience and relevant certifications.

California pay range: $240,000 USD - $295,000 USD

Visa Sponsorship

DensityAI sponsors qualified candidates for H-1B, O-1, TN, E-3, and other employment-based visas, and we welcome applicants on F-1 OPT and STEM-OPT. Work authorization is required at start; we provide immigration support to secure or transfer status.

Export Controls

Aspects of this role may involve access to information subject to U.S. export controls (EAR/ITAR). We may discuss licensing or scope adjustments during the interview.

Equal Opportunity

DensityAI is an Equal Opportunity Employer. We do not discriminate on the basis of race, color, religious creed, national origin, ancestry, physical or mental disability, medical condition, genetic information, marital status, sex, gender, gender identity, gender expression, age (40+), sexual orientation, military or veteran status, pregnancy, or any other status protected by law. We comply with the California CROWN Act and provide reasonable accommodations on request.