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227 fastapi developer jobs at 161 companies in California

1mo
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Senior Backend Engineer
San Francisco, California, United States
$175k-$275k/yr OnsiteFull Time
Hedra
Hedra: Builds artificial intelligence models for character-driven video generation.
5+ YOE5+ years backend development with Python, FastAPI/Pydantic; Kubernetes/EKS; relational databases; AWS stack; building scalable services.
Python, FastAPI, Pydantic, Kubernetes, EKS, PostgreSQL, Redis, S3, DynamoDB, AWS
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2mo
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Software Engineer, AI
El Segundo or United States
$131k-$150k/yr HybridFull Time
ImmunityBio
ImmunityBioNASDAQ: IBRX: Develops next-generation immunotherapies for cancer and infectious diseases.
3+ YOE3+ years in software development; Python and TypeScript; AI agent frameworks; Docker; FastAPI; production/MLOps experience; regulated environment preferred.
Python, TypeScript, LangGraph, LangChain, CrewAI, LlamaIndex, Docker, FastAPI
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1mo
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Senior Software Engineer
New York City or Arizona or California or Colorado or Connecticut or Florida or Georgia or Maine or Maryland or Massachusetts or Michigan or Minnesota or New Jersey or New York or North Carolina or Oregon or Rhode Island or South Carolina or Tennessee or Texas or Virginia or Utah or Wisconsin
$165k-$185k/yr RemoteFull Time
Electric
Electric: Provides automated IT management and security services for businesses.
8+ YOE8+ years backend experience with modern Python stack, leadership experience, proficiency in Postgres/SQLAlchemy, AWS, Terraform, FastAPI, React/TypeScript, observability, and familiarity with AI-assisted development.
Python, FastAPI, Pydantic, PostgreSQL, SQLAlchemy, Alembic, Temporal, Redis, AWS RDS, AWS S3, AWS SQS, AWS DynamoDB, AWS ECS, AWS IAM, Terraform, React, TypeScript, Claude Code
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1w
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Senior Backend Software Engineer
Arkansas or California or Colorado or District of Columbia or Florida or Illinois or Massachusetts or Maryland or Maine or Michigan or New Jersey or Ohio or Pennsylvania or South Carolina or Texas or Utah or Virginia or Washington
$165k-$195k/yr RemoteFull Time
SITE Technologies
SITE Technologies: Provides AI-powered property condition assessments and management software.
5+ YOE5+ years backend development experience with Python and FastAPI, strong backend architecture, relational modeling, AWS services, Docker, CI/CD, and cross-team communication.
Python, FastAPI, PostgreSQL, SQLAlchemy, Alembic, Flyway, AWS, ECS, Lambda, RDS, S3, IAM, Docker, Git, CI/CD, GitHub Actions, AWS CodePipeline, Claude Code, Cursor, Terraform, Terragrunt, Datadog, Sentry, LangGraph, Claude Code SDK, Amazon Bedrock
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2mo
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Intern, AI/ML Software Engineer - Summer 2026 (San Diego, CA, US)
San Diego, California, United States
$32-$58/hr OnsiteInternship
Murata
MurataTokyo Stock Exchange: 6981: Murata manufactures electronic components and wireless connectivity modules.
0+ YOEPython programming, ML concepts, backend development with Flask or FastAPI
Python, Flask, FastAPI, OpenAI, LangChain, SQL, NoSQL, Vector Databases, React, Svelte, AWS, Azure, GCP
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1w
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Senior Software Engineer II, Enterprise Platform
San Francisco, California, United States
$180k-$256k/yr OnsiteFull Time
Lila Sciences
Lila Sciences: Develops an AI platform for autonomous scientific research and discovery.
7+ YOE7+ years backend engineering experience with APIs, multi-tenancy, auth, Python/FastAPI, Kubernetes, AWS, and database design; strong API design and developer experience focus.
Python, FastAPI, Kubernetes, AWS, SQL, OpenAPI, OIDC, OAuth 2.0, OPA, REST
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4w
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Sr Product Engineer
Palo Alto or California
$180k-$250k/yr OnsiteFull Time
Alma
Alma: Legal tech platform automating U.S. immigration and visa processes.
5+ YOE5+ years backend development experience; proficiency with Python, FastAPI, PostgreSQL; experience with LLM/ML products; comfortable owning frontend (React/TypeScript); BS/MS in CS or related; located in San Francisco Bay Area or willing to relocate.
Python, FastAPI, PostgreSQL, TypeScript, React, Claude Code, Codex, Cursor, MCP servers, LLMs, ML, AWS, Supabase, LaunchDarkly, Betterstack
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2w
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Founding Engineer
San Francisco, California, United States
$120k-$150k/yr OnsiteFull Time
Avent Industrial
Avent Industrial: AI-powered operating system for industrial supply chains.
Experienced engineer to build core systems for quoting, procurement, and decision-making; systems thinking, high ownership, speed with judgment; familiarity with Next.js, TypeScript, Python/FastAPI, and PostgreSQL.
Next.js, TypeScript, Python, FastAPI, PostgreSQL
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Staff Platform Engineer (Pacific Time Zone)
San Francisco, California, United States
$225k-$275k/yr HybridFull Time
Komodo Health
Komodo Health: Provides AI-driven healthcare data and patient journey analytics software.
Senior backend engineer with platform and control-plane experience; strong Python (FastAPI) and AWS; multi-tenant SaaS; focus on observability, reliability, and developer productivity.
Python, FastAPI, AWS, Snowflake, Airflow, Spark, RBAC, API design, KMC/PSS
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1mo
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Senior Cloud Engineer
Brisbane or Seattle or Princeton
$151k-$183k/yr HybridFull Time
Bristol Myers Squibb
Bristol Myers SquibbNew York Stock Exchange: BMY: Develops and distributes innovative medicines for serious diseases.
5+ YOEBachelor's degree, 5+ years cloud/software engineering experience, hands-on AWS cloud-native development, Python/FastAPI or TypeScript/Node proficiency, Terraform/AWS CDK/CloudFormation, containerization, CI/CD, and experience building LLM/RAG/agentic AI applications.
AWS, Amazon S3, Amazon S3 Vectors, Amazon Athena, Amazon RDS, PostgreSQL, ElastiCache, Redis, OpenSearch, Amazon Neptune, AWS Fargate, AWS Lambda, AWS IAM, VPC, Python, FastAPI, TypeScript, Node, LangGraph, FastMCP, LangSmith, LangChain, PydanticAI, Claude Agent SDK, OpenAI, Anthropic, Gemini, AWS Bedrock, Claude Code, Codex, Gemini CLI, GitHub, GitHub Copilot, CI/CD, Terraform, AWS CDK, CloudFormation
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Backend Software Engineer
San Francisco, California, United States
$167k-$231k/yr HybridFull Time
Artos
Artos: AI-powered document authoring platform for life sciences R&D.
3+ YOE3+ years software development experience (AI/ML focus), BS/MS in CS/Engineering or equivalent, experience with GenAI, Python APIs (FastAPI/Django), containerized cloud deployments (Docker, AWS), CI/CD, and secure coding.
Python, FastAPI, Django, AWS, Docker, Terraform, Pulumi, React
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3mo
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Senior Full Stack Engineer
Burlingame, California, United States
$140k-$195k/yr HybridFull Time
SuperDial
SuperDial: Automates healthcare administrative phone calls with voice AI agents.
5+ YOE5+ years full-stack development; strong Python back-end (FastAPI, Django, Flask); JS/TypeScript with React; API design (REST/GraphQL); databases and system design.
Python, FastAPI, Django, Flask, JavaScript, TypeScript, React, Next.js, REST, GraphQL, AWS, GCP, Celery, Kafka, WebSockets
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1w
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Software Engineer
Mountain View, California, United States
$90k-$106k/yr OnsiteFull Time
Tata Consultancy Services
Tata Consultancy ServicesNational Stock Exchange of India: TCS: Global provider of IT services, consulting, and business solutions.
6+ YOE6+ years software engineering experience with Python, web frameworks (FastAPI/Flask), PostgreSQL, front-end (Angular/HTML/JavaScript/CSS), GCP and Kubernetes.
Python, FastAPI, Flask, PostgreSQL, Angular, HTML, JavaScript, CSS, Google Cloud Platform (GCP), App Engine, Cloud SQL, Kubernetes
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2w
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Backend Engineer - Mission Operations Services
San Francisco or Golden or Toulouse
$140k-$190k/yr OnsiteFull Time
Loft Orbital
Loft Orbital: Deploy and operate satellite missions for organizations and governments.
Production Python development, Docker/container experience, backend web frameworks (Django/Flask/FastAPI), API design (HTTP/GraphQL/REST), and working with databases (Postgres, time-series DBs). Experience operating mission-critical systems preferred.
Python, Docker, Django, Flask, FastAPI, GraphQL, HTTP, REST, Postgres, InfluxDB, TimescaleDB, Kubernetes, Cockpit
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3w
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ML Platform Engineer
United States or San Francisco
$136k-$167k/yr RemoteFull Time
Stitch Fix
Stitch FixNASDAQ: SFIX: Online personalized styling service and curated clothing delivery.
5+ YOE5+ years software development experience focused on data/ML/AI infrastructure; building scalable distributed systems; strong coding and design skills; proficiency with Python/Golang, Kafka, Postgres, Redis, FastAPI, Ray; cloud experience (AWS).
Python, Golang, Kafka, Postgres, Redis, FastAPI, Ray, AnyScale, LangGraph, LangSmith, AWS
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1mo
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ESS Mission Planning Associate/Experienced Software Engineer
Seal Beach, California, United States
$113k-$175k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
3+ YOEBachelor's degree, active U.S. DoD Secret clearance, 3+ years software development for space/ground systems, experience with Python/Java/TypeScript/FastAPI, CI/CD, GitLab, Kubernetes, Postgres, and Agile/DevSecOps practices.
Python, Java, TypeScript, FastAPI, Kubernetes, Postgres, SQL, NoSQL, GitLab, CI/CD, DevSecOps
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3w
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Product Engineer
San Francisco, California, United States
$115k-$150k/yr OnsiteFull Time
Workhelix
Workhelix: Provides software to measure and optimize enterprise AI ROI.
2+ YOE2+ years full-stack engineering experience; strong Python and React preference; SQL fluency; experience with FastAPI/Postgres/React stack; strong communication, systems mindset, and customer-focused problem solving.
FastAPI, Python, Postgres, PostgreSQL, React, SQL, Slack
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2mo
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Product Engineer
San Francisco or New York
OnsiteFull Time
Ciridae
Ciridae: Develops AI-native operating systems for real-economy businesses.
Build AI-native applications end-to-end using React/TypeScript, Python, FastAPI, and Postgres; ship features with observability and real customer impact. Strong experience with at least one LLM API and RAG mindset.
React, TypeScript, Python, FastAPI, PostgreSQL, LLM API
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3mo
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Senior Full Stack Engineer, Agentic Security
San Francisco or Amsterdam or New York or London or Bengaluru
RemoteFull Time
Dynamo AI
Dynamo AI: A building trustworthy AI infrastructure and security products for enterprise deployments.
Strong full-stack experience building backend services and React/TypeScript UIs; proficiency with Python/FastAPI, PostgreSQL, Redis, Docker/Kubernetes, CI/CD, and AWS; familiarity with agentic/AI-assisted development workflows.
Python, FastAPI, NestJS, React, TypeScript, PostgreSQL, Redis, Dockerfiles, Helm charts, GitHub Actions, K8s, AWS, PyInstaller, Cursor, Claude Code, agent skills, CLI, Next.js, uv, pyproject.toml, ArgoCD, Redis Streams, Git
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2mo
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Senior Backend Engineer, Connectors & Discover
San Francisco or Austin or Madison
$174k-$260k/yr HybridFull Time
Zendesk
Zendesk: Provides cloud-based software for customer service and support.
3+ YOE3+ years backend engineering, Python, FastAPI, MongoDB/Elasticsearch/OpenSearch, Redis; distributed job processing; data pipelines; observability.
Python, FastAPI, MongoDB, OpenSearch/Elasticsearch, Redis, RQ/Celery, Dagster, Airflow, S3
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