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250 fastapi developer jobs at 152 companies in California

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Backend Engineer (Python/FastAPI)
United States or Seattle or San Francisco
$200-$300/hr RemoteContract
Turing
Turing: AI research accelerator and intelligent talent cloud platform.
3+ YOE3+ years of software engineering experience; expertise in Python and JavaScript, including React and Node.js; production deployment, architecture, debugging, code review, and clear technical communication skills.
Python, FastAPI, JavaScript, React, Node.js, C, C++, Java, Rust, Go
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1mo
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Senior Engineer
Santa Clara, California, United States
$120k-$150k/yr OnsiteFull Time
Tata Consultancy Services
Tata Consultancy ServicesBSE: 532540: Global leader in IT services, consulting, and business solutions.
6+ YOEExpertise in Python or Java, full-stack development (Next.js/React/TypeScript), GraphQL and FastAPI backend, prompt engineering and GenAI tooling, cloud deployment on AWS/Azure, and bachelor's degree or equivalent.
Python, Java, Ariadne(GraphQL), appoloClientGraphQL, FastAPI, Next.js, React, TypeScript, Javascript, GitHub Copilot, Amazon Code Whisperer, GPT-4, Claude, Llama, AWS Lambda, S3, EC2, SageMaker, Azure Functions, Blob Storage, Azure OpenAI Service
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1mo
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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: AI-powered facility intelligence platform helps commercial, industrial, and retail property owners assess assets and plan maintenance.
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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1mo
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Senior Software Engineer II, Enterprise Platform
San Francisco, California, United States
$180k-$256k/yr OnsiteFull Time
Lila Sciences
Lila Sciences: Builds AI and autonomous labs for scientific 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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2mo
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Founding Engineer
San Francisco, California, United States
$120k-$150k/yr OnsiteFull Time
Avent Industrial
Avent Industrial: Private AI software helping industrial distributors and manufacturers automate quoting, order entry, and operations.
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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2mo
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Sr Product Engineer
Palo Alto or California
$180k-$250k/yr OnsiteFull Time
Alma
Alma: Private AI-powered immigration law firm and legal-services platform serving businesses and individuals.
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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1w
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Senior Forward Deployment Engineer
New York City or San Francisco or Princeton
RemoteFull Time
Quantiphi
Quantiphi: AI-first digital engineering helping enterprises solve complex business problems with artificial intelligence, cloud, and data engineering.
9+ YOERequires 9+ years of software engineering experience, expertise in full-stack development, data architecture, React, JavaScript/TypeScript, Python, FastAPI, PostgreSQL, Redis, PySpark, AWS, and technical leadership.
React, JavaScript, TypeScript, Python, FastAPI, PostgreSQL, RDS, Aurora, Redis, PySpark, Kestra, AWS, EKS, Kubernetes, GitHub Copilot, Cursor, LLM
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Backend Software Engineer
San Francisco, California, United States
$167k-$231k/yr HybridFull Time
Artos
Artos: Artos is an AI-powered document platform helping biopharma teams create and manage regulatory submissions.
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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2mo
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Backend Engineer - Mission Operations Services
San Francisco or Golden or Toulouse
$140k-$190k/yr OnsiteFull Time
Loft Orbital
Loft Orbital: Space infrastructure helping governments, companies, and research institutions deploy and operate missions in low Earth orbit.
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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2mo
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ML Platform Engineer
United States or San Francisco
$136k-$167k/yr RemoteFull Time
Stitch Fix
Stitch FixNasdaq Global Select Market: SFIX: Online personal styling and apparel retailer serving U.S. clients with human stylists, AI recommendations, and delivered clothing.
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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2mo
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Product Engineer
San Francisco, California, United States
$115k-$150k/yr OnsiteFull Time
Workhelix
Workhelix: Enterprise SaaS helping organizations identify, measure, and grow the business value of AI investments.
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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1mo
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AI Engineer
San Francisco, California, United States
$170k-$220k/yr OnsiteFull Time
LiteLLM
LiteLLM: Private software providing an open-source AI gateway for developers and enterprises.
1+ YOE1-2 years backend/full-stack production experience; familiarity with OpenAI API and LLM APIs; strong Python and FastAPI skills; experience with Redis and Postgres; passion for open source and user engagement.
Python, LLM APIs, FastAPI, Redis, Postgres, OpenAI API, Anthropic, Python SDK
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6d
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Staff Software Engineer
Austin or Mountain View or Marin County or Contra Costa County or San Francisco County or Alameda County or San Mateo County or Santa Clara County or Santa Cruz County
$207k-$662k/yr HybridFull Time
General Motors
General MotorsNYSE: GM: Designing, building, and selling the world's best vehicles.
8+ YOEBachelor’s degree and 8+ years of software engineering experience. Requires Python, FastAPI, React, TypeScript, distributed systems, cloud, databases, security, CI/CD, observability, and technical leadership.
Python, FastAPI, React, TypeScript, Java, Spring Boot, PostgreSQL, Azure, Docker, Kubernetes (K8s), GitHub Actions, GitHub, Redis, Helm, GitOps, Argo CD
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4w
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Backend Data Engineer
Massachusetts or California or Maryland or Texas or Virginia or Dubai or Bosnia And Herzegovina or Croatia or Serbia or Belgrade or Sarajevo or Tuzla or Washington
HybridFull Time
Ruya AI
Ruya AI: Venture-backed defense-technology building AI-native intelligence software for sovereign institutions and affiliated organizations.
Production experience with Python, FastAPI, TypeScript, Express, PostgreSQL, OAuth/OIDC, JWT, authorization, service contracts, testing, observability, and distributed-system reliability.
Python, FastAPI, TypeScript, Express, PostgreSQL, OIDC, JWT, Sentry, Langfuse, Pydantic, asyncio, Snowflake, ClickHouse, NetworkX, Temporal, GCP, AWS, REST APIs, SSE, WebSocket
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2mo
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SATCOM Mission Planning Software Engineer (Associate or Experienced)
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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2w
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Staff Software Engineer
El Segundo, California, United States
$150k-$240k/yr HybridFull Time
Circadia Health
Circadia Health: Saving lives with AI-powered contactless monitoring
7+ YOERequires 7+ years shipping full-stack production software, strong Python, FastAPI, Pydantic, 3+ years React, AWS, databases, testing, integrations, customer experience, and technical ownership.
React, Python, FastAPI, Pydantic, PointClickCare, Homecare Homebase, WellSky, HL7 v2, FHIR, REST, SFTP, CDC, AWS, PyTest
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1w
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Software Engineer II
Glendale or New York City
$118k-$165k/yr HybridFull Time
Disney Streaming
Disney Streaming: Technology subsidiary operating direct-to-consumer streaming services for Disney, Hulu, and ESPN+ audiences.
3+ YOE3+ years building production ML backends and REST APIs; Python, PyTorch or TensorFlow, FastAPI or Flask, data processing, GitHub, Docker, and AWS/EKS. Bachelor's degree or equivalent experience required.
Python, PyTorch, GPU, MLflow, Weights & Biases, PySpark, Pandas, Databricks, GitHub, Docker, AWS, EKS, TensorFlow, Flask, Claude, GPT-4, FastAPI, LangChain, LangGraph, Datadog, Grafana, Conviva, Spark, Snowflake
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10h
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Senior Backend Engineer
Boston or Los Angeles or Seattle or United States
$165k-$200k/yr RemoteFull Time
Re:Build Manufacturing
Re:Build Manufacturing: Integrated design, engineering, and manufacturing for U.S. production.
5+ YOERequires 5+ years building production backend systems, including 3+ years with Python; FastAPI, PostgreSQL, Celery/Redis, Docker, CI/CD, API architecture, and AI coding tool experience.
Python, FastAPI, PostgreSQL, Cursor, Copilot, Claude, REST APIs, OpenAPI, SQLAlchemy, Celery, Redis, LangChain, LangGraph, Anthropic Claude, OpenRouter, SSE, GCP, Cloud Run, Cloud SQL, Memorystore, Terraform, Docker, CI/CD, OIDC, JWT, OpenAI, Pub/Sub, Secret Manager
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6d
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Software Engineer, API(Python)
Bengaluru or San Mateo
HybridFull Time
Nexla
Nexla: Privately held enterprise data-integration platform that helps organizations deliver governed data products for AI agents and applications.
7+ YOE7+ years of software engineering with Python; FastAPI or Starlette and SQLAlchemy; strong SQL and relational database skills; testing and production operations experience; practical AI tooling experience.
Python, FastAPI, SQLAlchemy, Starlette, MySQL, Postgres, Celery, Dramatiq, Kafka, RabbitMQ, Redis Streams, AWS, GCP
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1mo
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Founding Product Engineer
San Francisco, California, United States
$200k-$250k/yr OnsiteFull Time
Mondrio
Mondrio: AI-powered B2B pricing software that helps companies continuously optimize pricing and guide deals with expert support.
8+ YOE8+ years engineering experience, shipped end-to-end product areas, strong backend depth with FastAPI/Python/MongoDB, frontend experience with React/TypeScript, US work authorization required, no visa sponsorship.
TypeScript, React, Vercel Chat SDK, Python, FastAPI, Mongo, Atlas, GCP, Pulumi, Cloudflare Pages, FastMCP, Langfuse, Claude Code, Cursor, Vercel Eve
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