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72 fastapi developer jobs at 48 companies in Massachusetts

1w
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Senior Software Engineer
Bengaluru or Framingham or Sweden or India
OnsiteFull Time
Definitive Healthcare
Definitive HealthcareNasdaq: DH: Publicly traded healthcare data and analytics serving life sciences, providers, and healthcare-adjacent organizations.
7+ YOERequires 7+ years of Python backend development, Django or FastAPI, RESTful APIs, microservices, WebSockets, Redis, PostgreSQL, Docker, Kubernetes, Git, JIRA, Linux, and agile Scrum experience.
Python, Django, FastAPI, WebSockets, Redis, PostgreSQL, SQLAlchemy, Django ORM, Linux, Docker, Kubernetes, Git, JIRA
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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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2w
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Senior Python Developer
Boston or Montreal or India or Brossard
HybridFull Time
Ampliwork
Ampliwork: Enterprise AI agent automating complex, compliance-heavy workflows for financial, professional, transportation, and government organizations.
5+ YOESenior Python engineering experience with FastAPI, Pydantic, AWS, cloud-native systems, databases, APIs, automated testing, CI/CD, and Generative AI or agentic frameworks.
Python, FastAPI, Pydantic, AWS, PostgreSQL, NoSQL, CI/CD, Generative AI, Unit testing, Regression testing, Integration testing, Performance testing
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2mo
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Staff Software Engineer (Backend)
Boston or Cambridge
HybridFull Time
Axiomatic AI
Axiomatic AI: Physics-based AI software helping engineers design and verify photonic, semiconductor, and other complex systems.
10+ YOE10+ years backend development with 2+ years in a staff/principal role; deep Python and FastAPI experience; distributed systems, SQLAlchemy/PostgreSQL, GCP, AI/LLM integration, technical leadership, RFCs and architecture design.
Python, FastAPI, SQLAlchemy, Pydantic AI, FastMCP, Alembic, PostgreSQL, Redis, REST, WebSockets, SSE, MCP, Anthropic Claude, Google Gemini, OpenAI, Vertex AI Model Garden, Mistral OCR, Google Cloud Platform, Cloud Run, Cloud SQL, GCS, VPCs, IAM, Auth0, Terraform, Docker, GitHub Actions, Logfire, Sentry, OpenTelemetry, pytest, pytest-asyncio, pytest-cov
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3w
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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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1mo
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Senior AI Engineer
Seattle or Cambridge or Princeton or Madison
$138k-$183k/yr OnsiteFull Time
Bristol Myers Squibb
Bristol Myers SquibbNYSE: BMY: Transforming patients' lives through science.
5+ YOEBachelor's degree,5+ years building and scaling cloud-native AI applications,proficiency in Python/FastAPI or TypeScript/Node,AWS experience,LLM/agent integration,CI/CD and infra-as-code knowledge.
AWS, Claude, LangSmith, Python, FastAPI, TypeScript, Node, LangGraph, Claude Agent SDK, LangChain, PydanticAI, Anthropic, OpenAI, Gemini, Grok, AWS Bedrock, Terraform, AWS CDK, CloudFormation, GitHub, Claude Code, Codex, Gemini CLI, Cursor, Windsurf, GitHub Copilot, LangSmith, promptfoo
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2mo
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Senior Software Engineer
Somerville or Washington
$160k-$190k/yr HybridFull Time
VIA
VIA: Private cybersecurity technology protecting government and enterprise data with decentralized, quantum-resistant Web3 solutions.
5+ YOEBachelor's in CS/Math/Engineering/Science, 5+ years full-stack/backend experience, cloud microservices, cryptography, Istio, FastAPI, Docker, Helm, SQL/NoSQL, CI/CD, automated testing, strong communication.
Istio, FastAPI, Docker, Helm, OAuth2, IETF RFCs, SQL, NoSQL
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1mo
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Senior AI Engineer
Seattle or Madison or Princeton or Cambridge
$138k-$183k/yr OnsiteFull Time
Bristol Myers Squibb
Bristol Myers SquibbNYSE: BMY: Transforming patients' lives through science.
5+ YOE5+ years building cloud-native AI applications integrating LLMs, agents, retrieval, and workflows; strong Python/FastAPI or TypeScript/Node skills; AWS experience; knowledge of secure, observable, production AI patterns.
Python, FastAPI, TypeScript, Node, LangGraph, Claude Agent SDK, LangChain, PydanticAI, MCP, FastMCP, Anthropic, OpenAI, Gemini, Grok, AWS Bedrock, AWS, Terraform, AWS CDK, CloudFormation, GitHub, LangSmith, promptfoo, Claude Code, Codex, Gemini CLI, Cursor, Windsurf, GitHub Copilot
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3mo
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Automation Engineer - Scientific Data, AI/ML Pipelines & Integration Dev
Boston, Massachusetts, United States
HybridFull Time
Zifo RnD Solutions
Zifo RnD Solutions: Scientific informatics and AI consulting firm serving science-driven organizations in pharma, biotech, chemicals, and consumer goods.
3+ YOEProficient in Python with FastAPI, SQL/NoSQL, AWS, CI/CD, data pipelines, and lab informatics.
Python, FastAPI, Flask, Django, AWS, S3, EC2, Lambda, Step Functions, RDS, Aurora, IAM, monitoring, logging, Git, GitHub Actions, GitLab CI, Jenkins, CI/CD, PyTest, unittest, mocking, pandas, NumPy, scikit-learn
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1mo
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Forward Deployed Engineer
Cambridge, Massachusetts, United States
$100k-$130k/yr HybridFull Time
Upgraid
Upgraid: AI building-upgrade sales platform helps retrofit providers target properties, assess needs, and prepare proposals.
Full-stack engineer experienced with Python/FastAPI, PostgreSQL, AWS, and a modern JS framework; strong client-facing experience and ability to deliver production-ready customer solutions.
Python, FastAPI, PostgreSQL, AWS, Svelte, React, Vue
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1mo
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Senior Software Engineer
Boston or Encinitas
$142k-$192k/yr OnsiteFull Time
Paperless Parts
Paperless Parts: Private manufacturing-software helping job shops and contract manufacturers quote faster.
5+ YOE5+ years experience building full-stack web applications; strong Python (Django/FastAPI), TypeScript/React, AWS, PostgreSQL, Docker, and CI/CD (Jenkins) experience; API design and mentoring skills; US citizenship or green card required.
Python, Django, FastAPI, TypeScript, React, PostgreSQL, AWS, Docker, Jenkins, Node/Express, Java/Spring
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2mo
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Senior Software Engineer - Product
Yonkers or Washington or Colchester or Arizona or California or Connecticut or Illinois or Maryland or Massachusetts or Michigan or New Hampshire or New Jersey or New York or Texas or Vermont or Virginia or District of Columbia
$115k-$160k/yr RemoteFull Time
Consumer Reports
Consumer Reports: Independent nonprofit consumer organization providing product testing, journalism, ratings, research, and advocacy for consumers.
5+ YOE5+ years software engineering experience; proficiency with React, React Native, Python (FastAPI); experience building multi-platform apps, CI/CD, automated testing, observability; strong communication; bachelor’s degree preferred.
React, React Native, Python, FastAPI, AWS, Azure, Google Cloud Platform, CI/CD
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1mo
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Senior Full Stack Software Developer
Boston, Massachusetts, United States
$170k-$190k/yr HybridFull Time
Nexamp
Nexamp: U.S. clean-energy developer and owner serving communities and businesses with community solar and energy-storage projects.
7+ YOE7+ years full stack experience with React, TypeScript, Python (Django/FastAPI), SQL, cloud platforms (Azure), Git, CI/CD, and Terraform; strong communication, debugging, and mentorship skills; financial modeling experience a plus.
React, TypeScript, Python, Django, FastAPI, SQL, Git, CI/CD, Terraform, Azure
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2mo
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AIML Software Engineer, AI for Science
London or San Francisco or Zug or Heidelberg or Cambridge
$136k-$227k/yr HybridFull Time
GSK
GSKLondon Stock Exchange (LSE): GSK: Global biopharmaceutical focused on medicines and vaccines.
Degree in a quantitative/engineering discipline or equivalent experience; advanced Python and FastAPI programming; experience with GCP/Azure and cloud-native architectures; familiarity with PyTorch/JAX/TensorFlow, CI/CD, containerization, SQL and production monitoring.
Python, FastAPI, GCP, Azure, PyTorch, JAX, TensorFlow, CI/CD, Kubernetes, Google Kubernetes Engine, Cloud Run, Cloud Storage, Artifact Registry, Cloud SQL, SQL, Terraform, shell scripting
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3w
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Clinical Imaging Platform Engineer
Anywhere in the world
$140k-$180k/yr HybridFull Time
a2z Radiology AI
a2z Radiology AI: Medical technology building AI software that triages urgent abdomen-pelvis CT findings for radiologists and hospitals.
Build clinical imaging software across React, TypeScript, Python, FastAPI, DICOM, AWS, and annotation systems, with strong product engineering, metrics, coordinate systems, and patient-data safety skills.
React, TypeScript, Vite, Cornerstone3D, VTK.js, Jotai, TanStack Query, Tailwind, Playwright, Python, FastAPI, pytest, AWS, Terraform, DynamoDB, Amazon S3, Cognito, SQS, ECS, Lambda, DICOM, DICOMweb, HTJ2K, NIfTI, RLE
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3w
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Senior Software Engineer I/II, Back-end/Data, Robotics
Cambridge, Massachusetts, United States
$144k-$240k/yr OnsiteFull Time
Lila Sciences
Lila Sciences: Builds AI and autonomous labs for scientific discovery.
4+ YOERequires 4–8 years of backend engineering with Python and FastAPI, data pipelines, SQL, PostgreSQL, S3, cloud-native delivery, containers, infrastructure as code, CI/CD, and end-to-end service ownership.
Python, FastAPI, Temporal, Flyte, SQL, PostgreSQL, Amazon S3, AWS EKS, Docker, Amazon ECR, Terraform, GitHub Actions, Ray, Weights & Biases, NATS, MQTT
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1w
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Senior Lead Software Engineer, Developer Infrastructure
Boston, Massachusetts, United States
$216k-$324k/yr OnsiteFull Time
Klaviyo
KlaviyoNYSE: KVYO: Marketing automation and CRM platform for e-commerce businesses.
12+ YOERequires 12 years of software development experience, distributed systems and architecture expertise, programming and cloud proficiency, and strong leadership and communication skills. Bachelor's degree or equivalent experience required.
Go, Python, AWS, Azure, GCP, Kubernetes, Docker, Terraform, Pants, FastAPI, Django, React, Buildkite, Apache Kafka, Apache Pulsar, RabbitMQ, Spark, Airflow, MySQL, PostgreSQL, ClickHouse, Redis, TypeScript, Babel, Jest, Webpack, Graphite, StatsD, Chronosphere, Pantsbuild, Argo
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1mo
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Senior Software Development Engineer
Cambridge, Massachusetts, United States
$125k-$160k/yr HybridFull Time
Mitsubishi Electric Iconics Digital Solutions
Mitsubishi Electric Iconics Digital Solutions: Mitsubishi Electric’s private automation-software subsidiary develops visualization, HMI, SCADA, and digitalization software for industrial and building operators.
8+ YOE8+ years software development experience, proven technical leadership, production experience with generative AI, cloud-native architectures, full-stack development, and a bachelor's in CS or equivalent practical experience preferred.
Python, JavaScript, TypeScript, C#, Java, React, Vue, Angular, Node.js, Express, FastAPI, Django, Flask, ASP.NET, Spring Boot, PostgreSQL, SQL Server, DynamoDB, MongoDB, LLM APIs, AWS, Azure, GCP, Docker, Kubernetes, Terraform, CloudFormation
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Senior Software Engineer
Boston or Needham
$80k-$150k/yr HybridFull Time
Wellington Management
Wellington Management: Provides global investment management services.
7+ YOEBachelor's degree and 7+ years developing backend systems with Python, Java, TypeScript, enterprise frameworks, SQL, cloud platforms, integrations, and production support; technical leadership required.
Python, Java, TypeScript, FastAPI, Spring, React, SQL, Oracle, PostgreSQL, MySQL, Jira, Git, Jenkins, GitHub Actions, Visual Studio Code, IntelliJ IDEA, Docker, AWS, Azure, Claude Code, GitHub Copilot, Kubernetes, REST APIs, CI/CD
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Staff Software Engineer: Growth Engineering
United States or Hawaii or California or New York City or Seattle or Washington or Texas or Connecticut or Illinois or Massachusetts or New Hampshire or New Jersey or Oregon or Rhode Island or Vermont or Alabama or Alaska or Arizona or Arkansas or Colorado or Delaware or Florida or Georgia or Idaho or Indiana or Iowa or Kansas or Kentucky or Louisiana or Maine or Maryland or Michigan or Minnesota or Mississippi or Missouri or Montana or Nebraska or Nevada or New Mexico or North Carolina or North Dakota or Ohio or Oklahoma or Pennsylvania or South Carolina or South Dakota or Tennessee or Utah or Virginia or West Virginia or Wisconsin or Wyoming
$137k-$203k/yr RemoteFull Time
ModernHEALTH
ModernHEALTH: Private workforce mental health platform providing employers’ employees and families with coaching, therapy, group support, and digital care.
8+ YOERequires 8+ years of software development experience, 2+ years of full-stack web development, and expertise with Python, JavaScript/TypeScript, React, React Native, APIs, databases, technical leadership, and mentoring.
Python, Django, Flask, FastAPI, aiohttp, GraphQL, REST, React, React Native, TypeScript, Redux, Vite, PostgreSQL, Redis, Docker, Amazon Web Services (AWS), ECS, RDS, CloudFront, SQL, bash, SSO SAML, OIDC, JWT, AI, LLM
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