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128 fastapi developer jobs at 92 companies in Fairfield, CA

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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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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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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2mo
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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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1mo
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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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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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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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3mo
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Senior/Staff Software Engineer (Full-Stack Engineer)
New York or San Francisco
$120k-$180k/yr HybridFull Time
Actively AI
Actively AI: AI agents for automated enterprise revenue and sales operations.
5+ YOE5+ years in building customer-facing full-stack products; strong React/TypeScript; Python/FastAPI backends; system design and platform thinking; experience with AI-enabled workflows.
React, TypeScript, Python, FastAPI, SQL, NoSQL
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3mo
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Founding AI Backend Engineer
San Francisco or New York
OnsiteFull Time
Pakket
Pakket: AI-powered operating system for warehouse logistics and operations.
3+ YOE3–6 years backend or full-stack experience; strong Python; FastAPI; SQL databases; Linux; Docker; cloud infrastructure; debugging mindset.
Python, FastAPI, PostgreSQL, SQLAlchemy, Linux, Docker, AWS, GCP, Render, DigitalOcean, OpenCV, YOLO
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2mo
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Platform Engineer, GenAI/ML
San Francisco, California, United States
$155k-$175k/yr HybridFull Time
Strava
Strava: Fitness tracking and social networking app for athletes.
Experience building AI/ML platforms, GenAI, and MLOps; production cloud experience; strong data tooling; familiarity with LangChain, FastAPI, MLflow, Kubeflow, and data technologies; collaborative and ownership mindset.
LangChain, FastAPI, MLflow, Kubeflow, Feast, Pandas, Spark, Airflow, SQL, Snowflake, AWS
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2w
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Principal Engineer, CoCounsel
Eagan or Frisco or New York City or Toronto or Ann Arbor or San Francisco or Los Angeles or Irvine or McLean or Washington
$159k-$295k/yr HybridFull Time
Thomson Reuters
Thomson ReutersNASDAQ: TRI: Provides professional software, data, and news services globally.
Bachelor's degree (or equivalent) in CS or CE, deep Python and distributed systems experience, hands-on AI/LLM and agent experience, FastAPI/PostgreSQL/AWS familiarity, identity/IAM (SAML, OIDC, OAuth 2.0) expertise, strong communication.
Python, FastAPI, PostgreSQL, AWS, SSO, SAML, OIDC, OAuth 2.0, RBAC, ABAC, Anthropic, OpenAI, LLMs, MCP servers, vector databases, embeddings, semantic search
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2mo
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Senior Backend Engineer (Python)
San Francisco, California, United States
$175k-$250k/yr RemoteFull Time
Ellipsis Health
Ellipsis Health: AI-powered voice agent for healthcare care management.
4+ YOE4+ years building production back-ends in Python; real-time streaming; AWS/GCP/Azure; PostgreSQL/Redis; FastAPI/asyncio; HIPAA security.
Python, FastAPI, asyncio, WebRTC, WebSockets, gRPC, AWS, GCP, Azure, Kubernetes, Kafka, SQS, Pub/Sub, Terraform, PostgreSQL, Redis, OpenTelemetry
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Software Engineer - Full Stack
San Francisco, California, United States
$120k-$150k/yr OnsiteFull Time
Clera
Clera: AI talent agent matching professionals with high-growth startup roles
Experience owning end-to-end production projects, building backend systems and APIs, strong AWS and Python (Django/FastAPI) skills, PostgreSQL expertise, and legal authorization to work in the US without sponsorship.
REST, gRPC, AWS, Python, Django, FastAPI, PostgreSQL, ClickHouse, Docker, Kubernetes, Kafka, Redis Streams
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3mo
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Staff Backend Software Engineer
San Francisco or Montreal
RemoteFull Time
Saris AI
Saris AI: Automates banking back-office workflows using autonomous AI agents.
Backend software engineer with Python (Django/Flask/FastAPI), TypeScript (React), Docker, AWS/GCP; design scalable distributed systems.
Python, Django, Flask, FastAPI, TypeScript, React, Docker, AWS, GCP, PostgreSQL, Redis, REST, GraphQL
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3mo
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Software Engineer - Senior Backend
San Francisco, California, United States
HybridFull Time
FriendliAI
FriendliAI: High-performance generative AI inference platform and serving infrastructure.
5+ YOE5+ years backend or systems engineering; CS/comp eng degree; Python and FastAPI; distributed systems; API design; PostgreSQL and OLAP; multi-tenant SaaS; cloud-native; observability.
Python, FastAPI, PostgreSQL, ClickHouse, REST, gRPC, GraphQL, OpenTelemetry, Kubernetes
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