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109 fullstack engineer jobs at 79 companies in California

1mo
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Senior Fullstack Engineer - Growth
Los Gatos or Birmingham
RemoteFull Time
The Overflow
The Overflow: Private fintech SaaS platform helping churches, nonprofits, and mission-driven organizations process cash and non-cash donations.
5+ YOE5+ years fullstack engineering experience; strong React, TypeScript, Node.js; experience building RESTful APIs and relational schema; product-led growth mindset; mentorship and on-call participation.
React, TypeScript, Node.js, RESTful API
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1w
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Fullstack Engineer
Washington, D.C. or London or New York City or Miami or San Francisco or Dubai or Singapore or Hong Kong or Tokyo
HybridFull Time
Elliptic
Elliptic: Private British blockchain analytics and crypto-compliance software serving banks, exchanges, governments, and digital-asset businesses.
Production software engineering experience with TypeScript, React, Nest.js, Postgres, Kubernetes, AWS, Terraform, and Datadog; AI-assisted development and cryptocurrency or blockchain interest required.
TypeScript, React, Nest.js, Postgres, Kubernetes, AWS, Terraform, Datadog
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1w
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Fullstack Engineer
San Francisco, California, United States
OnsiteFull Time
Krea
Krea: N AI creative platform helping visual creatives generate, edit, and enhance images, video, and 3D.
Full-stack JavaScript/TypeScript engineering with frontend focus; SvelteKit, WebSockets, APIs, database schemas, caching, Kubernetes, Postgres, Redis, and observability experience preferred.
Svelte, SvelteKit, TypeScript, Node, Postgres, Redis, WebSockets, HTTP/3, AWS EKS, Kubernetes, Prometheus, OpenTelemetry, Axiom, HyperDX, GitHub, Slack, Notion, SAML, SSO, SCIM
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6d
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Fullstack Engineer, App Platform
San Francisco or Seattle or New York City or Los Angeles or United Kingdom or Ireland or Poland or Germany or Australia
$207k-$230k/yr HybridFull Time
Whatnot
Whatnot: Live shopping marketplace connecting buyers and sellers.
5+ YOERequires 5+ years of software development experience, a bachelor's degree or equivalent experience, React and GraphQL web development, scalable fullstack systems expertise, and strong product, ownership, mentoring, and problem-solving skills.
React, GraphQL, Next.js, Node, Python, Postgres
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2mo
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Staff Fullstack Engineer, Agentic Applications
Mountain View, California, United States
$192k-$260k/yr OnsiteFull Time
Databricks
Databricks: Data and AI software providing a unified platform.
8+ YOE8+ years software engineering with 2+ years building production LLM/agentic applications; deep Python fluency; experience with agentic frameworks, REST/GraphQL integrations, Databricks/Spark, and technical leadership.
Python, LangChain, LangGraph, CrewAI, AutoGen, Semantic Kernel, RAG pipelines, REST, GraphQL, Databricks Unity Catalog, Databricks, Spark, Workday, Greenhouse, ADP, MLflow
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3mo
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Fullstack Software Engineer
San Francisco, California, United States
$170k-$200k/yr HybridFull Time
Collective
Collective: Private U.S. financial back-office platform serving self-employed entrepreneurs with formation, accounting, bookkeeping, payroll, and tax services.
3+ YOE3–4 years of production software experience; strong fullstack skills (Python, Django, React); experience with external APIs and real-world data; hands-on AI developer tools; ability to ship end-to-end features with instrumentation; SQL and data warehousing (BigQuery a plus).
Python, Django, React, SQL, BigQuery, APIs
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1mo
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Staff Fullstack Engineer
Menlo Park, California, United States
$236k-$339k/yr HybridFull Time
Snowflake
SnowflakeNYSE: SNOW: Cloud-based data platform for AI, analytics, and data applications.
Senior-level full-stack engineer with experience shipping customer-facing products, building scalable systems, mentoring engineers, and working across frontend and backend stacks.
JavaScript, React, Go, Java
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1mo
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Fullstack Engineer
San Francisco, California, United States
$145k-$240k/yr OnsiteFull Time
Circleback
Circleback: AI-powered meeting notes and automations
Build and ship end-to-end across web, desktop, and mobile; design systems; work on AI, search, transcription, and performance; strong product sense and mentoring experience.
React, Next.js, Electron, Swift, React Native
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3w
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Senior Fullstack Engineer
Da Nang or San Francisco or United States or Vietnam or Europe
OnsiteFull Time
Flodesk
Flodesk: Private email marketing and commerce SaaS platform for small businesses, creators, solopreneurs, and coaches.
Strong frontend or backend engineering skills; TypeScript, React, modern build tools, SOA, Golang or Node.js, databases, AWS, scalable systems, AI-assisted development, product thinking, ownership, and collaboration.
TypeScript, React, Vite, Turbo, Golang, Node.js, MongoDB, PostgreSQL, AWS, Claude Code, Cursor, Codex, Figma, Shopify, Zapier, WooCommerce, MacBook Pro
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2mo
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Sr. Fullstack Platform Engineer - (Backend Focus)
Los Angeles or California or United States
$140k-$180k/yr RemoteFull Time
Salt AI
Salt AI: Software providing governed, auditable AI workflows for regulated life sciences, financial, energy, and government organizations.
Senior backend/platform engineer with deep Python/Django, APIs, cloud infrastructure, Kubernetes, distributed systems, workflow execution, observability, and fullstack familiarity (TypeScript/React). High product judgment and experience using AI engineering tools.
Python, Django, TypeScript, React, Kubernetes, Claude Code, Cursor, Codex, GitHub
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2mo
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Fullstack Software Engineer, Applied AI
San Francisco, California, United States
$130k-$500k/yr OnsiteFull Time
Mercor
Mercor: AI-powered talent marketplace connecting contractors with global organizations.
5+ YOE5+ years fullstack experience; JS/TS (React/Next.js); Python/Node.js backend; data pipelines; strong UX; able to own frontend and backend.
React, Next.js, Python, Node.js, REST, Relational databases
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1mo
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Fullstack AGE
San Francisco, California, United States
OnsiteFull Time
E3 Group
E3 Group: AI freight transformation building custom agentic workflows for middle-market brokers, enterprise shippers, and 3PLs.
Proven fullstack development experience; front-end (HTML,CSS,JavaScript,React/Angular) and back-end (Node.js,Python,Ruby,Java) proficiency; RESTful API and Git experience; strong problem-solving and communication skills.
HTML, CSS, JavaScript, React, Angular, Node.js, Python, Ruby, Java, RESTful API, Git
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3w
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Principal Fullstack Engineer
Los Angeles, California, United States
$185k/yr OnsiteFull Time
Flight Group
Flight Group: Creator-economy holding that builds media, technology, community, and venture businesses for creators.
Design and ship large-scale distributed systems with TypeScript, React, Node.js, Python, and Google Cloud or AWS; architect production AI/ML and LLM systems; communicate and mentor effectively.
TypeScript, React, Node.js, Python, Google Cloud, AWS
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1mo
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Senior Fullstack Engineer
San Francisco, California, United States
$230k-$280k/yr OnsiteFull Time
Mochi Health
Mochi Health: Private telehealth serving patients with personalized virtual clinical care, weight management, and treatments across 120+ conditions.
5+ YOE5+ years full-stack experience, production systems experience, strong frontend state management, data modeling, ownership of lifecycle, experience with Kubernetes/Terraform/AWS, mentoring skills, and familiarity using frontier AI tools.
Kubernetes, Terraform, AWS, React, CI/CD, Codex 5.3, Claude Opus 4.6
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1mo
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Senior Fullstack Engineer
Palo Alto or San Francisco
$170k-$210k/yr HybridFull Time
Midi Health
Midi Health: Insurance-covered virtual healthcare clinic providing telehealth care for women navigating menopause and midlife health.
6+ YOE6+ years building production full‑stack web applications; strong system design; hands‑on experience with Django/DRF and React/Next.js or equivalent; fluent with AI coding tools; excellent communication and mentorship.
Claude Code, Cursor, Copilot, Django, DRF, React, Next.js
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1mo
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Fullstack Engineer, Ambient AI
Mountain View, California, United States
$130k-$180k/yr HybridFull Time
Commure
Commure: AI-native healthcare technology providing revenue-cycle, clinical-workflow, and ambient-AI software to health systems and providers.
Professional software development experience; strong full-stack skills; experience with React/Flutter/Typescript, Python and backend frameworks; familiarity with Docker/Kubernetes and production reliability; BS/MS in CS/Engineering or equivalent.
Python, Javascript, React, Flutter, Flask, Typescript, Docker, Kubernetes, LLMs
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1mo
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Fullstack Software Engineer
Irvine, California, United States
$130k-$170k/yr OnsiteFull Time
TP-Link Systems Inc.
TP-Link Systems Inc.: Private U.S.-based networking-equipment and smart-home-device maker serving consumers, businesses, and service providers globally.
5+ YOEBachelor's degree or equivalent experience, 5+ years in software engineering, JavaScript framework expertise, PHP plus Go or Java backend experience, and web application, SEO, accessibility, and responsive design experience.
React, Vue, Angular, PHP, Go, Java, Figma, Adobe Photoshop, Google Analytics, Core Web Vitals, Adobe Creative Cloud
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3mo
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Fullstack Software Engineer, AI Agents (Copy)
San Francisco, California, United States
$150k-$250k/yr OnsiteFull Time
11x.ai
11x.ai: Private AI automation building autonomous digital workers for sales, RevOps, and go-to-market teams.
3+ YOE3+ years as software/product engineer; strong fullstack with TypeScript, React, Next.js, Node.js; ownership of products from concept to launch; high agency; strong product intuition; able to work in ambiguity; bias toward building and prototyping; strong cross-functional communication; interest in AI-native workflows.
TypeScript, React, Next.js, Node.js, Cursor, Claude, Windsurf, v0
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2mo
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Fullstack Developer (US)
New Jersey or New York City or San Francisco
OnsiteFull Time
Lynx Analytics
Lynx Analytics: AI-native consulting firm helping global life sciences organizations make commercial and clinical decisions with data and AI.
5+ YOEBachelor's in CS, 5+ years full-stack development across front- and back-end, experience with React/Next.js and Python, cloud-native experience, overlap 3 hours/day with Pacific Time, strong communication.
React, Next.js, Jest, React Testing Library, Python, AWS, Azure, GCP, Docker, Kubernetes, CI/CD
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2mo
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Senior Fullstack Engineer - Growth + Onboarding
New York City or San Francisco or Los Angeles
$180k-$210k/yr HybridFull Time
Radix Health
Radix Health: Healthcare technology helping providers achieve fair reimbursement through integrated IDR software, data, and AI.
6+ YOE2+ Mgmt6+ years software engineering experience with recent backend work, 2+ years managing engineers, experience with integrations and third-party APIs, customer-facing communication, Python familiarity, and Bachelor's in STEM preferred.
EDI, 835/837, HL7, FHIR, ICD-10, CPT, Epic, Cerner, SFTP, Python
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