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Founding Full Stack Software Engineer Jobs in Berkeley, CA

Clera

Founding Full Stack Engineer

San Francisco, CA · On-site

$180K - $230K/yr

... Founding Engineer. You'll join the CTO as a core member of a tiny, high-caliber team and help set ... You'll own problems across the full stack, from LLM orchestration to embeddable frontend widgets to ...

Clera

Founding Full Stack Engineer

San Francisco, CA · On-site

$180K - $230K/yr

... Founding Engineer. You'll join the CTO as a core member of a tiny, high-caliber team and help set ... You'll own problems across the full stack, from LLM orchestration to embeddable frontend widgets to ...

Satori Digital

Full Stack Engineer

San Francisco, CA · On-site

$175K - $220K/yr

We're looking for a product minded Full Stack Software Engineer who thrives at the intersection of ... Either as one of three profiles: a) joined early and seen scale over 3-5+ years, b) founding ...

Fennel AI

Founding Full Stack Engineer

Menlo Park, CA · On-site

Ability to independently develop, own and execute on a roadmap * 2+ years of industry experience as a software engineer with full-stack experience * Curiosity to work in a new field - previous ...

Weekday

Founding Full-Stack Engineer

San Francisco, CA · On-site

Early hire / founding engineer Why This Role Exists You'll help build the core product from the ground up. This is a hands-on role for someone who loves shipping, thrives in ambiguity, and wants ...

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Founding Full Stack Software Engineer information

See Berkeley, CA salary details

$54.5K

$165K

$233.3K

How much do founding full stack software engineer jobs pay per year?

As of Jun 27, 2026, the average yearly pay for founding full stack software engineer in Berkeley, CA is $165,018.00, according to ZipRecruiter salary data. Most workers in this role earn between $135,900.00 and $193,500.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Founding Full Stack Software Engineer, and why are they important?

To thrive as a Founding Full Stack Software Engineer, you need deep expertise in both front-end and back-end development, strong problem-solving skills, and experience building scalable web applications, usually demonstrated by a degree in computer science or equivalent experience. Mastery of tools and frameworks such as JavaScript, React, Node.js, cloud platforms (AWS, GCP), and version control systems like Git is typically required. Exceptional communication, adaptability, and entrepreneurial mindset are crucial for collaborating in a dynamic startup environment and driving product vision. These skills are vital for rapidly iterating, shipping robust products, and establishing a strong technical foundation for a growing company.

What are Founding Full Stack Software Engineers?

Founding Full Stack Software Engineers are technical professionals who join a startup at its earliest stages to help build and shape the company's core products and technology infrastructure. They work across both the front-end and back-end of applications and play a key role in making architectural decisions, setting up development processes, and establishing the technical foundation. As 'founding' team members, they often have greater responsibilities, including working closely with company founders, contributing to product strategy, and sometimes receiving equity or a stake in the company.

What unique challenges might I face as a Founding Full Stack Software Engineer in an early-stage startup?

As a Founding Full Stack Software Engineer, you’ll often juggle multiple responsibilities, from designing core architecture to deploying code and setting up development workflows. Since resources are limited and the product vision can evolve quickly, adaptability and strong communication with founders and other early team members are key. You may also be deeply involved in decisions beyond pure engineering, such as hiring, product strategy, and even customer support. This environment can be both demanding and highly rewarding, offering accelerated learning and significant influence over the company’s technical direction.
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Founding Full Stack Software Engineer jobs near you

Founding Full Stack Engineer

Clera

San Francisco, CA • On-site

$180K - $230K/yr

Full-time

Posted 3 days ago

Job description

About the Role

A well-funded, early-stage B2B SaaS startup in the AI-powered sales automation space is hiring its first Founding Engineer. You'll join the CTO as a core member of a tiny, high-caliber team and help set the technical culture for everyone who comes after. The company builds self-improving conversational agents that run product demos 24/7 — adapting to each buyer, handling technical questions, and getting smarter with every conversation. Growth has tripled month-over-month and demand is accelerating.

What You'll Work On

There are no strict lanes here. You'll own problems across the full stack, from LLM orchestration to embeddable frontend widgets to eval pipelines. Key technical pillars include:

  • The Agent: LLM orchestration, conversation flow, tool use, and voice. Agents must understand unfamiliar products and explain them clearly to prospects with varying levels of context.

  • The Experience: Embeddable, generative UI that adapts in real-time — fast-loading, interactive, and responsive across products and screen sizes.

  • The Platform: Customer-facing tooling for configuring agents, managing flows, reviewing conversations, and measuring performance.

  • Evals & Self-Improvement: Pipelines that measure agent quality and feed learnings back automatically, so demos get smarter without manual intervention.

  • Infrastructure: Zero cold starts, instant agent response, and versioning systems that let customers preview changes before they go live.

Day-to-Day Examples

  • Debug conversation logs, trace where an LLM lost the thread during a pricing objection, and ship a fix to the orchestration layer by lunch.

  • Prototype a generative UI widget in an afternoon based on a whiteboard sketch and have something demo-able by end of day.

  • Trace a quality regression to a prompt change, roll it back, and add an automated test to prevent recurrence.

  • Design agent versioning infrastructure from scratch so customers can safely preview updates.

What We're Looking For

Required:

  • Proven experience designing and building LLM-based conversational agents — orchestration, tool use, prompt engineering, and conversation flow.

  • Production backend development experience in Python (services, APIs, backend infrastructure).

  • Frontend experience with React — building interactive, adaptive UIs and rapid prototyping.

  • Demonstrated ability to deliver full-stack features end-to-end: frontend, backend, integration, and deployment.

  • Experience building evaluation pipelines, automated regression tests, observability tooling, and CI/CD workflows.

  • Experience designing deployment and versioning infrastructure for agents (feature flags, preview environments, versioned rollouts).

  • Experience with voice-enabled or browser-based agents (STT/TTS, WebRTC, or browser automation) or equivalent voice/browser + LLM integration experience.

  • Experience deploying and operating production services on cloud platforms (AWS or GCP) with Docker; Kubernetes or similar orchestration a plus.

  • Strong product sense: ability to rapidly prototype, iterate on feedback, and prioritize high-impact work in a fast-moving environment.

  • Experience at an early-stage startup or demonstrated ability to thrive in ambiguous, high-velocity environments.

  • Strong written and verbal communication skills — comfortable debugging issues with customers and documenting design decisions clearly.

  • Willingness to be available for urgent production issues and participate in on-call or incident response rotations.

Nice to Have:

  • Familiarity with reinforcement learning workflows (RL, RLHF, reward modeling) or experimentation frameworks applied to agent improvement.

Compensation & Benefits

  • Salary: $180,000 – $230,000 USD annually

  • Early-stage equity commensurate with founding engineer role

  • Visa sponsorship is not available — candidates must be legally authorized to work in the United States

Location

This role is fully on-site in San Francisco, CA, five days per week. Remote or hybrid arrangements are not available for this position.