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173 founding engineer jobs at 80 companies in Vacaville, CA

2mo
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Founding Engineer
San Francisco, California, United States
$175k-$225k/yr OnsiteFull Time
Clera
Clera: AI talent agent matching professionals with high-growth startup roles
2+ YOEComputer Science degree required, 2+ years professional software engineering experience, strong CS fundamentals, startup experience valued, proficiency in Python (typed scientific Python).
Python
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2mo
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Founding Software Engineer
San Francisco, California, United States
$150k-$250k/yr OnsiteFull Time
Tamarind Bio
Tamarind Bio: AI-powered platform for computational biology and drug discovery.
Founding software engineer with full-stack expertise; strong AWS, Docker, CUDA, TensorFlow/PyTorch; React; onsite in SF; equity.
Python, React, AWS, Docker, CUDA, Conda, TensorFlow, PyTorch, Slurm, Bash, APIs, Web apps
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1mo
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Founding Engineer
San Francisco, California, United States
$120k-$160k/yr OnsiteFull Time
Aurorin
Aurorin: Modern AI-native CAD software for mechanical engineers
Strong systems programming/native app background, experience with Swift and C++, GPU programming experience preferred, proactive and high-responsibility engineer.
Swift, C++
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1w
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Founding Engineer
San Francisco or Lausanne
HybridFull Time
Compresr
Compresr: Provides an API that compresses LLM context to reduce costs.
Experienced full-stack engineer with strong backend fundamentals, concurrency/distributed systems, AWS production deployment, Python and light frontend skills, and excellent communication.
Python, FastAPI, PostgreSQL, Supabase, Redis, AWS, Next.js, React, TypeScript, GitHub, Docker, Sentry, GitHub Actions, Claude Code
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3mo
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Founding Engineer
San Francisco, California, United States
HybridFull Time
Double Blind Bio
Double Blind Bio: Develops AI agents automating administrative clinical trial workflows.
Strong full-stack engineering with deep AI/ML expertise; evals, observability, production LLMs; product-minded; healthcare familiarity; fast-paced, autonomous work.
LangSmith, Braintrust, Weights & Biases, Honeyhive
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2mo
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Founding AI Engineer
San Francisco, California, United States
$120k-$180k/yr OnsiteFull Time
Bild AI
Bild AI: AI-powered platform for construction blueprint analysis and cost estimation.
Applied CV/ML experience; 0-to-1 builder; growth mindset; strong communication.
Computer Vision, Large Language Models, Multimodal AI, Production ML
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2w
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Infinite.dev - Founding Engineer
San Francisco, California, United States
OnsiteFull Time
YieldNest
YieldNest: Liquid restaking protocol for risk-adjusted DeFi yields.
2+ YOE2–5+ years software engineering experience; proficiency in two of Next.js, TypeScript, C#, Go, or Python; experience with event-driven architectures, full-stack ownership, and AI-assisted development tools.
Next.js, TypeScript, C#, Go, Python, Cursor, windsurf
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Founding Software Engineer - Backend
San Francisco, California, United States
$125k-$300k/yr OnsiteFull Time
Hypercubic
Hypercubic: AI platform for modernizing large-scale legacy enterprise software.
0+ YOEFounding backend engineer with strong engineering and design taste; ownership over architecture and engineering culture. Experience with AI-powered systems and legacy modernization is a plus.
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2mo
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Founding Engineer - Software
San Francisco or United States
$200k-$350k/yr RemoteFull Time
uRun
uRun: Infrastructure cloud for interactive, stateful AI inference.
7+ YOE7+ years backend experience; proficient in TypeScript/Node.js or Python/Go; API design, distributed systems; cloud, containers, performance, and concurrency; real-time/latency-sensitive systems.
TypeScript, Node.js, Python, Go, WebRTC, WebSockets, Kubernetes, Observability, Cloud, Containers
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3mo
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Founding Software Engineer
San Francisco, California, United States
$160k-$300k/yr OnsiteFull Time
Lance
Lance: Autonomous AI agents for hotel operations and guest services.
Proficient in software development; experience with ML/AI; design scalable systems; strong collaboration; startup mindset; BS or higher in CS/Engineering.
Python, JavaScript, Cloud infrastructure, Deployment pipelines, Machine Learning
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3mo
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Founding Platform Engineer
San Francisco, California, United States
$170k-$250k/yr HybridFull Time
Kos
Kos: AI-powered automated financial operations for industrial infrastructure.
2+ YOE2+ years of production systems experience; shipped systems; on-call experience; SOC 2 awareness; strong CS/EE foundations.
Identity and RBAC, ERP integrations, Multi-channel messaging, Observability
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1w
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Founding Engineer
San Francisco, California, United States
OnsiteFull Time
Mesh
Mesh: AI-powered governance layer for financial accounting and operations.
Experienced engineer with strong systems judgment, customer obsession, first-principles thinking, AI-native engineering, end-to-end ownership, and ability to build reliable backend and workflow systems.
Python, FastAPI, SQLAlchemy, PostgreSQL, Celery, React, TypeScript, Tailwind, Vite, Anthropic, OpenAI, AWS, ECS, RDS, S3, Lambda
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1mo
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Founding Engineer
San Francisco, California, United States
$120k-$250k/yr OnsiteFull Time
Dataleap
Dataleap: Building an agentic work platform for enterprise teams.
Backend-heavy, AI-native full-stack engineer with strong Go experience, product sense, ability to scope and deliver end-to-end, build agentic systems, review code quickly; former founder a plus.
Go, Vite, TypeScript, Claude Code
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2mo
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Founding Forward Deployed Engineer
San Francisco, California, United States
$180k-$260k/yr OnsiteFull Time
Amari
Amari: AI agents automating document-heavy workflows for the logistics industry.
5+ YOE5-9 years of professional software engineering; senior IC or tech lead; customer-embedded engineering background; strong Python fundamentals; experience with AI/LLM infrastructure; able to ship production systems at scale.
Python, Frontend, AI/LLM infrastructure, Document processing pipelines
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2w
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Founding AI Engineer
San Francisco, California, United States
$225k-$255k/yr OnsiteFull Time
Mondrio
Mondrio: AI-native platform for agentic pricing and revenue management.
8+ YOE8+ years engineering experience with production LLMs, built evals/observability, shipped LLM features, strong communication, product-engineer instincts, US work authorization required.
TypeScript, React, Vercel Chat SDK, Python, FastAPI, Mongo, Atlas, GCP, Pulumi, Cloudflare Pages, FastMCP, Langfuse, Claude Code, Cursor, Vercel Eve, LangChain, LlamaIndex, Braintrust, OpenRouter
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21h
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Founding Research Engineer
New York City or San Francisco
$215k-$330k/yr OnsiteFull Time
Ambral
Ambral: AI-powered account managers for enterprise customer success teams.
4+ YOE4+ years building production software or ML systems, including 2+ years with RL environments or evaluation/agent infrastructure; strong software engineering, data processing, reproducibility, and evaluation skills.
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2mo
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Founding Recruiter
San Francisco, California, United States
$170k-$210k/yr OnsiteFull Time
Lightfield: AI-powered CRM automating customer interaction capture and insights.
5+ YOE5+ years of full-cycle recruiting, with a focus on scaling engineering teams in fast-paced environments.
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2mo
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Founding Recruiter
San Francisco, California, United States
OnsiteFull Time
OpenEvidence
OpenEvidence: AI-powered medical research and clinical decision support platform.
5+ YOEOwn full recruiting lifecycle; build systems; attract top engineers and scientists; partner with founders to define exceptional hires.
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1w
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Founding Engineer (Product)
San Francisco, California, United States
OnsiteFull Time
Polymr
Polymr: AI-native procurement and manufacturing workflow automation platform.
Experience building product-grade software for procurement or supply-chain contexts; customer-embedded development, strong problem-solving, and comfort using AI coding tools.
Claude Code, Cursor
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3w
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Founding Researcher
San Francisco, California, United States
$400k-$500k/yr OnsiteFull Time
Miso Labs
Miso Labs: Developing emotive foundation models for real-time voice AI.
Bachelor's degree or equivalent experience in a technical field, hands-on research and engineering on model training, experience with PyTorch and CUDA, ability to own long-term research outcomes.
PyTorch, CUDA, H100, STT, LLM, TTS
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