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Software Engineer Fullstack Jobs in California (NOW HIRING)

3Y

Staff Software Engineer, Fullstack

San Francisco, CA · On-site

$200K - $250K/yr

About Us At 3Y Health, we are building AI-driven software to empower healthcare providers and solve ... About the Role We are seeking a Fullstack Engineer to help us craft intuitive, high-performance ...

Mosaic.tech

Software Engineer, Fullstack

San Francisco, CA · On-site

$198K - $295K/yr

Our team of fullstack engineers are responsible for the critical workflows that our customers use ... What you will do As a software engineer you'll work across the full stack, from complex user-facing ...

Namely

Staff Software Engineer, Fullstack

Los Angeles, CA · On-site

$192K - $252K/yr

About the role We are hiring for Staff Software Engineers, Fullstack (with a frontend lean) to join several teams across the Oscar Engineering organization. In this role, you will lead technical ...

Worky

Software Engineer, Fullstack

San Jose, CA · On-site

As a Software Engineer you'll contribute with increasing autonomy while partnering closely with UX, Product, Data Science, QA, and other engineers. You'll help break down ambiguous problems, make ...

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Software Engineer Fullstack information

See California salary details

$42.5K

$142.5K

$197.1K

How much do software engineer fullstack jobs pay per year?

As of Sep 13, 2026, the average yearly pay for software engineer fullstack in California is $142,522.00, according to ZipRecruiter salary data. Most workers in this role earn between $121,400.00 and $164,900.00 per year, depending on experience, location, and employer.

What is a software engineer fullstack?

A Software Engineer Fullstack is a professional who develops and maintains both the front-end (client side) and back-end (server side) components of web applications. They are proficient in a range of technologies, including user interface design, server programming, databases, and APIs. This role requires a broad understanding of how web applications work from end to end, enabling them to build complete, functional products. Fullstack engineers are valuable for their versatility and ability to collaborate across different areas of a development project.

What are the key skills and qualifications needed to thrive as a software engineer fullstack?

To thrive as a Software Engineer Fullstack, you need strong proficiency in both front-end (e.g., JavaScript, HTML/CSS, frameworks like React or Angular) and back-end (e.g., Node.js, Python, Java, databases) development, typically supported by a degree in computer science or related experience. Familiarity with version control systems like Git, CI/CD pipelines, cloud services, and relevant certifications (such as AWS Certified Developer or similar) is highly beneficial. Effective problem-solving, communication, and teamwork skills help you collaborate across multidisciplinary teams and adapt to evolving project requirements. These combined skills ensure you can build, maintain, and optimize complete web applications that meet both user and business needs.

How does a software engineer fullstack typically collaborate with other team members during a project?

Fullstack Software Engineers often work closely with both frontend and backend specialists, designers, and product managers to deliver end-to-end solutions. They participate in agile ceremonies such as daily stand-ups, sprint planning, and code reviews, ensuring alignment across the development process. Effective communication and cross-functional collaboration are key, as fullstack engineers bridge the gap between user-facing features and backend services. This collaborative environment helps foster continuous learning and exposure to diverse technologies.

What are popular job titles related to Software Engineer Fullstack jobs in California?

For Software Engineer Fullstack jobs in California, the most frequently searched job titles are:

What job categories do people searching Software Engineer Fullstack jobs in California look for?

The top searched job categories for Software Engineer Fullstack jobs in California are:

Software Engineer Fullstack jobs near you
Infographic showing various Software Engineer Fullstack job openings in California as of August 2026, with employment types broken down into 1% As Needed, 90% Full Time, 6% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $142,522 per year, or $68.5 per hour.

AI Software Engineer (Fullstack)

Walnut Creek, CA • On-site

Clearstory
See more jobs at Clearstoryexternal

Full-time

Medical, Dental, Vision

Re-posted 26 days ago

Job description

Clearstory is hiring an AI Agent Engineer (Fullstack) to help build the next generation of intelligent automation across our platform. AI agents are becoming core to how Clearstory delivers value - surfacing change order insights, automating cost workflows, and giving construction teams superpowers they didn't have before. In this role, you'll own AI agents end-to-end: from scoping a workflow with product, to designing prompts and tools, to building the eval harnesses that prove the agent works, to shipping the surfaces where the agent shows up in our product.
This is a high-impact role for an engineer who's been building with LLMs in production and is ready to own a category-defining surface area. You'll work directly with our Head of AI, product leaders, and senior engineers to ship agents that move the needle for general contractors, specialty contractors, and owners managing billions of dollars in change orders every month.
Clearstory is an AI-forward engineering organization. We use modern AI tools every day - not as a novelty, but as core leverage. You'll have access to the best agent platforms, frontier models, and internal tooling we've built to ship faster while holding a high bar for craftsmanship and reliability.
We operate in a hybrid work model: 3 days per week in the office, with the option to work 2 days per week from home if desired. We value in-person collaboration while supporting flexibility.
As an AI Software Engineer, you will:
  • Own AI agents and workflows end-to-end - from scoping the workflow with product and design, through prompt and tool design, to production deployment and continuous iteration.
  • Build across the full stack - agent orchestration backends, tool/API integrations, evaluation pipelines, observability, and the product surfaces where agents show up.
  • Design and run evals - golden sets, LLM-as-judge frameworks, regression evals - so we ship agents that work, not demos that don't.
  • Integrate with the construction tech ecosystem - accounting systems, project management tools, document repositories - and our own BigQuery-backed data platform.
  • Partner closely with product, design, and other engineers to translate messy real-world workflows into reliable agent behaviors.
  • Shape the future of our agent platform - surface unmet needs, prototype new patterns, and influence how AI shows up across Clearstory's product.
  • Move fast in a SOC 2-compliant environment, using modern AI development workflows.
About You
We're looking for someone who:
  • Has shipped production LLM systems - not prototypes, not hackathon projects. You can talk through an agent or workflow you've built, including its failure modes and the evals you put around it.
  • Operates with high agency in ambiguous environments. You don't need a PRD to start moving.
  • Is genuinely fullstack - comfortable from Postgres up through React, and not allergic to either end. Bonus points fo Golang experience.
  • Communicates clearly across engineering, product, and design. Low ego, collaborative, direct.
  • Cares deeply about reliability and craft. AI quality, latency, and cost tradeoffs are second nature.
  • Thrives in a fast-paced startup environment where the surface area is wide and the leverage is real.
  • Embodies our core values: Be Curious, Customer Obsession, and Keep It Simple.
About Clearstory
Clearstory is a first-of-its-kind, category-defining SaaS company revolutionizing how commercial construction teams manage and communicate change orders. Our platform digitizes and automates outdated, manual workflows, bringing efficiency, transparency, and collaboration to one of the most critical (and historically underserved) parts of construction.
We are:
  • A Series B, 100% SaaS company.
  • Trusted by over 50% of ENR's 2025 Top 50 GCs nationwide, with 14k+ contractors on the Clearstory network.
  • Processing $3B in change orders shared monthly across our platform.
  • Solving a multi-billion dollar problem with strong product-market fit.
  • Led by a team with deep expertise in both construction and software.

Requirements
  • 2-3+ years of professional software engineering experience, including production work on AI/LLM systems.
  • Strong proficiency in Python and TypeScript, including async programming.
  • Fullstack production experience - React/TypeScript on the frontend, modern backend services, REST APIs, Postgres.
  • Hands-on experience with modern LLM tooling: prompt engineering, function/tool calling, RAG patterns, vector stores, and at least one major model provider (Anthropic, OpenAI, Google).
  • Experience designing and running evaluation frameworks for LLM systems.
  • Comfort with cloud infrastructure (GCP preferred; AWS or Azure acceptable), Docker, and CI/CD.
  • Strong written and verbal communication - you can scope an agent with product, explain tradeoffs to an exec, and write docs your teammates actually want to read.
Nice to Have
  • Experience with agent orchestration frameworks (LangGraph, CrewAI, Claude Agent SDK) and observability tooling (Braintrust, LangSmith, Datadog, or equivalent).
  • Familiarity with MCP (Model Context Protocol) and building MCP servers or skills.
  • Experience with BigQuery, ClickHouse, or similar analytics warehouses.
  • Previous work in ConTech, FinTech, or other regulated enterprise verticals.
  • Background as a founding engineer or in an applied AI / platform engineering role at a fast-moving startup.

Benefits
  • Competitive salary and equity.
  • Subsidized healthcare, vision, and dental coverage.
  • Access to frontier AI tools and internal AI tooling to accelerate your work.
  • Access to online learning and professional development resources.
  • Regular interaction with executive leadership.
  • A collaborative and mission-driven team environment.

Apply