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79 senior fullstack engineer jobs at 63 companies in California

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Founding Full-stack / Product Engineer
Cupertino, CA, US
$130k-$300k/yr On-SiteFull Time
HiringCafe
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Help us build a 100× better job search engine. We need a full-stack engineer with great taste, sharp fundamentals, and a track record of shipping polished product on React/Next.js plus a real backend (Firebase, Elasticsearch, Redis, Stripe).
React, Next.js, TypeScript, Firebase, Elasticsearch, Redis, Stripe
Help us #BeatIndeed & #BeatLinkedIn
6d
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Senior Fullstack Engineer
San Francisco or Chicago
HybridFull Time
Plenful
Plenful: Automates administrative and operational workflows for healthcare organizations.
7+ YOE7+ years building customer-facing fullstack products; proficiency in JavaScript/TypeScript and working proficiency in Python; production-ready judgment in regulated healthcare; strong communication.
JavaScript, TypeScript, Python, Java, Ruby
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2d
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Senior Fullstack Engineer - Growth
Los Gatos or Birmingham
RemoteFull Time
Overflow
Overflow: Philanthropy platform for stock, crypto, and 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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Senior Fullstack Engineer
Menlo Park, California, United States
$200k-$288k/yr OnsiteFull Time
Snowflake
SnowflakeNYSE: SNOW: Cloud-based platform for data storage, processing, and analytics.
Senior-level full-stack engineering experience building customer-facing products and scalable systems; proficient with JavaScript (React), Go, and Java; strong product sense, communication, and mentoring ability.
JavaScript, React, Go, Java
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2w
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Senior Fullstack Engineer, Postman Insights
San Francisco or Boston or Austin or New York City or Tokyo or London or Bangalore
OnsiteFull Time
Postman
Postman: Platform for building, testing, and managing software APIs.
Senior fullstack engineer with strong track record launching user-facing frontend and backend features, architecture experience, driving large projects, fast startup experience, product focus, AI familiarity, and ability to work from San Francisco office 5 days/week.
Postman Insights, Postman
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2mo
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Senior Fullstack Engineer, Solve
Austin or Madison or San Francisco
$145k-$217k/yr HybridFull Time
Zendesk
Zendesk: Provides cloud-based software for customer service and support.
3+ YOE3+ years of production software experience; backend-first with APIs, async systems, integrations, and real-time systems; ownership of features end-to-end; experience with real-time or event-driven tech such as WebSockets/WebRTC.
Python, FastAPI, React, TypeScript, WebRTC, Redis, MongoDB, LLM / speech
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6d
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Senior Fullstack Engineer
San Francisco, California, United States
$230k-$280k/yr OnsiteFull Time
Mochi Health
Mochi Health: Provides telehealth weight management and prescription medication services.
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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5d
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Senior Fullstack Engineer
San Francisco, California, United States
$170k-$250k/yr OnsiteFull Time
Circleback
Circleback: AI-powered platform for capturing and managing workplace meeting intelligence.
3+ YOE3+ years building and shipping full‑stack software; experience with React/Next.js, Electron, Swift, React Native; AI and product-oriented engineering judgment.
React, Next.js, Electron, Swift, React Native
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2mo
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Senior Fullstack Engineer - New Product
San Mateo, California, United States
$130k-$280k/yr OnsiteFull Time
Verkada
Verkada: Sells integrated AI-powered cloud physical security hardware and software.
5+ YOE5+ years building production systems; strong backend (Go); AWS; full-stack across backend, frontend, and devices; distributed systems knowledge; startup mindset.
Go, AWS, APIs, Frontend, Distributed Systems
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2mo
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Senior Fullstack Software Engineer
San Diego, California, United States
RemoteFull Time
CourtAvenue
CourtAvenue: Digital transformation agency providing strategy and experience design.
7+ YOE7+ years of industry experience; full-stack development; strong communication; SaaS/cloud experience; client-facing skills; leadership in delivery.
NodeJS, JavaScript, SQL, C#, Java, Swift, Kotlin, RabbitMQ, MongoDB, ExpressJS, React, Vue, Webpack, AWS, Azure, Google Cloud, Docker, Container, Terraform, Ansible
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2mo
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Senior Fullstack/Frontend Engineer
Sunnyvale or Mountain View or Austin or San Francisco or United States
$145k-$261k/yr HybridFull Time
General Motors
General MotorsNYSE: GM: Manufactures and sells automobiles and automotive parts globally.
5+ YOE5+ years frontend experience; BS in CS or related field; strong JS/TS, React, REST/GraphQL; geospatial data experience; frontend performance; cross-functional collaboration.
JavaScript, TypeScript, React, Redux, Zustand, Mapbox GL, Deck.gl, OpenLayers, D3.js, REST, WebSocket, GraphQL, Node.js
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4w
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Senior Fullstack Engineer - Growth + Onboarding
New York City or San Francisco or Los Angeles
$180k-$210k/yr HybridFull Time
Pivotal Health
Pivotal Health: AI platform automating healthcare insurance claim disputes for providers.
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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1mo
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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: Provides an AI orchestration platform for life sciences 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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1mo
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Staff Fullstack Engineer, Agentic Applications
Mountain View, California, United States
$192k-$260k/yr OnsiteFull Time
Databricks
Databricks: A unified platform for data analytics and artificial intelligence.
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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2w
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Senior Fullstack Software Engineer A.I.
Palo Alto, California, United States
$146k-$173k/yr HybridFull Time
Pebl
Pebl: Platform for hiring, paying, and managing global employees.
8+ YOE8+ years software engineering experience, 1+ year building LLM/agentic products, strong frontend (React/TypeScript) and full-stack skills, prompt engineering and observability knowledge, product-focused UX and mentoring experience.
React, TypeScript
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1mo
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Staff Fullstack Engineer
New York City or San Francisco
HybridFull Time
Dispatch
Dispatch: Syncing client data across financial advisor software tools.
10+ YOE10+ years engineering experience; deep Node and React proficiency; track record architecting and shipping high-scale production systems; experience setting technical direction across teams; startup experience preferred.
React, Node, Fastify, MUI, React Query, Vite, Storybook, Playwright, Go, Postgres, gRPC, Protobuf, Redis, AWS, Terraform, GitHub Actions
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1mo
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Senior Fullstack Engineer, Growth & Monetization
New York City or San Francisco or Boston
$175k-$240k/yr OnsiteFull Time
LangChain
LangChain: Tools for building and deploying production-ready AI agents.
Extensive full-stack experience with React, TypeScript, and Go and/or Python; familiarity with Postgres, Redis, REST APIs, usage metering, subscriptions, and monetization systems; strong product intuition and analytics-driven mindset.
LangSmith, LangChain, LangGraph, Deep Agents, LangSmith Engine, React, TypeScript, Python, Go, REST APIs, Postgres, Redis
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1mo
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Fullstack Senior Software Engineer
Foster City, California, United States
HybridFull Time
Visa
VisaNYSE: V: Global payment technology facilitating electronic funds transfers.
2+ YOEMaster's degree in a technical field or Bachelor's + 2 years, or 5 years related experience; expertise in one or more languages (Java, C#, C++, Python, PHP, JavaScript); experience building scalable services; familiarity with front-end (HTML, CSS, JavaScript) and modern tools (Angular, React, Kubernetes, Docker).
HTML, CSS, JavaScript, Java, C++, C#, Python, PHP, Angular, React, Kubernetes, Docker, APIs
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1d
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Fullstack Senior Software Engineer, ArsenalOS
Costa Mesa, California, United States
$166k-$220k/yr OnsiteFull Time
Anduril Industries
Anduril Industries: Defense technology building autonomous military hardware and software.
5+ YOE5+ years software engineering experience, deep full‑stack web expertise (backend/frontend/integration), degree in CS/IS/EE or related, experience with high‑availability enterprise applications, U.S. Person required.
Javascript, React, Typescript, NextJS, ERP, MES, WMS, CRM
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1mo
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Fullstack Software Engineer, Applied AI
San Francisco, California, United States
$130k-$500k/yr OnsiteFull Time
Mercor
Mercor: Connecting expert human intelligence with frontier AI model development.
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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2mo
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Founding Fullstack Engineer
San Francisco, California, United States
$120k-$170k/yr OnsiteFull Time
MathGPT
MathGPT: Personal AI tutor for every STEM student.
Experience building and shipping modern web apps end-to-end (React/Typescript); strong product sense; polished UI; strong communication; simplifies code.
React, Typescript, React Native, Expo
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