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21 fastapi developer jobs at 14 companies in Lancaster, CA

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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3w
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Senior AI Engineer
United States or New York City or Palm Beach or Los Angeles or Miami or Greenwich or Westchester County or The Hamptons or San Francisco or Manhattan
$190k-$250k/yr RemoteFull Time
Atria Health Institute
Atria Health Institute: Membership-based concierge practice providing preventive, precision-based medical care.
4+ YOE4+ years building and operating LLM-powered production ML systems, strong Python, backend framework experience (FastAPI/Flask), LLM orchestration and retrieval design, Snowflake/dbt/Dagster/Airflow familiarity, evaluation systems, HIPAA/PHI knowledge, and strong written communication.
Python, FastAPI, Flask, Snowflake, dbt, Dagster, Airflow, vLLM, Triton, TGI, SGLang, LOINC, SNOMED CT, ICD-10, RxNorm, FHIR, HL7
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3d
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Sr. Full Stack Engineer
Tempe or Burbank
$135k-$163k/yr HybridFull Time
Entertainment Partners: Provides payroll and workforce management for entertainment productions.
6+ YOE6+ years software engineering experience, strong Python (FastAPI), React.js/TypeScript, API and database expertise, CI/CD and cloud experience, LLM/AI integration, bachelor's degree or equivalent.
Python, FastAPI, React.js, TypeScript, PostgreSQL, MySQL, MongoDB, ORMs, GitHub Actions, Jenkins, Microsoft Azure DevOps, Docker, Kubernetes, AWS, Azure, OCI, OpenAI, Anthropic/Claude, LangChain, LangGraph, pgvector, Pinecone, Weaviate, WebSockets, SSE, JWT, OAuth2
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2mo
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Software Engineer II
Glendale or Seattle or New York
$118k-$158k/yr HybridFull Time
The Walt Disney Company
The Walt Disney CompanyNYSE: DIS: Produces movies, operates theme parks, and provides streaming services.
3+ YOE3+ years backend development experience; AI/ML engineering knowledge; API design and cloud deployments; strong communication and collaboration.
FastAPI, Flask, PyTorch, TensorFlow, GitHub, Docker, AWS, EKS, LangChain, LangGraph
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2mo
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Software Engineer II
Glendale or New York City or Seattle
$118k-$158k/yr HybridFull Time
The Walt Disney Company
The Walt Disney CompanyNYSE: DIS: Produces media content and operates global theme parks.
3+ YOEBachelor’s degree in Computer Science or Engineering; 3+ years backend or AI-driven development; experience with API design and cloud deployments; strong collaboration and problem-solving skills.
FastAPI, Flask, PyTorch, TensorFlow, GitHub, Docker, AWS, EKS, LangChain, LangGraph, Claude, GPT-4, PySpark, Pandas, Datadog, Grafana, Conviva, Snowflake, Databricks
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1w
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Software Engineer I
Los Angeles, California, United States
$91k-$111k/yr HybridFull Time
Los Angeles Capital Management
Los Angeles Capital Management: Quantitative equity management for global institutional investors.
1+ YOEBachelor's in a quantitative field, 1+ year production software experience, strong Python and SQL skills, familiarity with testing and Git, and effective communication.
Python, FastAPI, Pydantic, GitHub Actions, Snowflake, Prefect, Git, SQL, Azure, Docker, Dagster, Airflow
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1mo
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GenAI Python Systems Engineer –Senior Manager
Chicago or Raleigh or Charlotte or Cincinnati or Cleveland or Columbia or Columbus or Dallas or Baltimore or Richmond or Rosemont or Sacramento or Boston or St. Louis or Salt Lake City or San Antonio or San Diego or San Francisco or Silicon Valley or Seattle or Spartanburg or Albany or Stamford or Tampa or Atlanta or Toledo or Austin or Tulsa or Washington or Denver or Des Moines or Detroit or Buffalo or Florham Park or Kansas City or Las Vegas or Little Rock or Los Angeles or Louisville or Birmingham or Fayetteville or Miami or Milwaukee or Minneapolis or Nashville or New Orleans or New York or Oklahoma City or Philadelphia or Phoenix or Pittsburgh or Portland
$124k-$280k/yr HybridFull Time
PwC
PwC: Providing audit, tax, and management consulting services to businesses.
8+ YOESenior Manager level with 8+ years of experience; proficient in Python, SQL, FastAPI; cloud certifications a plus; willing to travel up to 80%; Bachelor's degree required.
Python, SQL, FastAPI, Cloud Platforms, LLM techniques, Data Warehousing, Data Lakes, IAM
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2mo
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Senior Software Engineer | Remote
Los Angeles or United States
RemoteFull Time
TubeScience
TubeScience: Data-driven performance video production for social media advertising.
Senior full-stack engineer to lead frontend tooling, backend services, and cloud infrastructure for production AI integrations; strong JavaScript and Python skills, low-level language experience, media pipeline knowledge, observability and distributed systems expertise.
JavaScript, React, Vue, Angular, Python, C, C++, Rust, Zig, Next.js, FastAPI, Django, Flask, Docker, Kubernetes, PostgreSQL, MongoDB, Redis, Temporal, Airflow, Dagster, Kafka, RabbitMQ, ffmpeg, AWS, GCP, Azure
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2d
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Staff Software Engineer - Biller Workflows
Mountain View or Los Angeles or New York City or San Francisco
$210k-$275k/yr HybridFull Time
Commure
Commure: AI-powered software platform for healthcare workflow and administrative automation.
8+ YOE8+ years building large-scale full-stack applications; org-wide frontend leadership; deep React/TypeScript, Python, and PostgreSQL expertise; API and data-layer design; strong debugging, observability, and communication skills.
React, TypeScript, Python, FastAPI, PostgreSQL, StarRocks, ClickHouse, Druid, EDI X12, LLM, CI/CD
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2mo
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Staff Engineer, AI Platform
Santa Monica or New York or San Francisco or Los Angeles
$200k-$220k/yr HybridFull Time
Pivotal Health
Pivotal Health: AI platform automating healthcare insurance claim disputes for providers.
Hands-on software engineering leader building platform infrastructure for AI systems; experience with agent runtimes, observability, experimentation, and internal tooling; strong API/SDK design; comfortable in greenfield work; healthcare/payments domain a plus.
Python, FastAPI, GCP, LLM platforms, Observability tooling, A/B testing, SDKs and APIs
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4w
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Data Engineer
New York or Los Angeles or San Francisco
$140k-$175k/yr HybridFull Time
Regard
Regard: A that builds AI-powered software to improve clinical documentation and advance patient care.
3+ YOEBS or equivalent, 3+ years data engineering experience, Python and SQL proficiency, experience with PySpark and distributed data processing, AWS experience preferred, LLM-assisted development familiarity, and willingness to participate in on-call support.
S3, Apache Iceberg, EMR, PySpark, Dagster, Kubernetes, ClickHouse, PostgreSQL, FastAPI, Metabase, Python, SQL, AWS, AWS Athena, EHR, OMOP CDM, HIPAA, LLM
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1mo
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Trading, Investment & Optimization - QuantAI Engineer (Hybrid)
Seattle or Chicago or Los Angeles or Atlanta or Houston or Arlington or San Francisco or Morristown or Boston or Dallas or San Diego or New York
HybridFull Time
Accenture
AccentureNYSE: ACN: Global provider of management consulting and technology services.
3+ YOEBachelor's in CS/engineering or related field; 3+ years in client-facing tech delivery; strong backend/API/full-stack or ML workflows; experience with enterprise hardening and deployment.
Electron, FastAPI, Docker, cloud services, evaluation tooling, agent orchestration frameworks, MCP-style integrations, Python, TypeScript, JavaScript
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1mo
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Senior Platform Engineer, Data & AI Infrastructure
Durham or New York City or Los Angeles or Phoenix
$140k-$160k/yr HybridFull Time
McKinney
McKinney: Provides strategic advertising and creative marketing services to brands.
4+ YOE4+ years of professional software engineering with backend focus; strong Python, cloud, and data tooling; experience with AI/LLM integration and security best practices.
Terraform, GitOps, Snowflake, Fivetran, DBT, Python, FastAPI, Docker, Kubernetes, OpenAI, Anthropic, Google Gemini, BigQuery, Dataform, Cloud Run, Compute Engine, Secret Manager, Artifact Registry, Cloud Build, Cloud Monitoring, IAM, Secret Management, ECR, CodePipeline, CI/CD
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3mo
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Research Programmer I
Los Angeles, California, United States
$46-$51/hr RemoteFull Time
University of Southern California
University of Southern California: Private research university providing higher education and healthcare services.
3+ YOEMS in CS/Statistics/Mathematics; strong TypeScript/JavaScript and Python; 5 years React; 3 years Django/Flask/FastAPI; experience with MySQL/PostgreSQL; Git/GitHub; ability to work independently.
Python, TypeScript, JavaScript, React, Django, Flask, FastAPI, MySQL, PostgreSQL, Git, GitHub, Highcharts
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3mo
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Expert Senior Manager, Engineering Excellence
Atlanta or Austin or Boston or Chicago or Dallas or Houston or Los Angeles or New York City or San Francisco or Seattle or Silicon Valley or Washington DC
$258k-$294k/yr HybridFull Time
Bain & Company
Bain & Company: Provides global management consulting and strategy advisory services.
10+ YOE2+ Mgmt10+ years full-stack development; 6+ years microservice API; 4+ years consulting; 2+ years leading teams; 1+ years AI tools; strong CS fundamentals; Python; cloud experience; hybrid model travel ~25%.
Claude Code, Cursor, Codex, FastAPI, Swagger, OpenAPI, Python, CI/CD
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2w
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Agentic AI Architect - Intelligence Engineering (West)
Denver or East Bay or Los Angeles or Orange County or Phoenix or Portland or Salt Lake City or San Diego or San Francisco or Seattle or Silicon Valley
$108k-$237k/yr HybridFull Time
Slalom
Slalom: Provides business and technology consulting and software engineering services.
5+ YOE5+ years software engineering experience with 2+ years on generative/agentic AI, multi-agent system design, RAG architectures, cloud AI platform deployment, Python proficiency, and strong communication skills.
Python, FastAPI, Flask, Lang Graph, Strands Agents SDK, OpenAI Agents SDK, Google ADK, LangSmith, Model Context Protocol (MCP), AWS Bedrock, Azure AI Foundry, OpenAI Service, GCP Vertex AI, Gemini, Databricks, Claude Code, Cursor, Kiro, RAGAS, DeepEval
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