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Fastapi Jobs in Massachusetts (NOW HIRING)

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA · On-site

$113K - $155K/yr

... FastAPI, Django preferred). • Experience creating human and automated evals to ensure high AI model quality. • Proficient in big data tools such as Apache Spark and Hadoop. • Deep experience ...

Klaviyo

Senior AI Engineer

Boston, MA · On-site

$113K - $155K/yr

... FastAPI, Django preferred). • Experience creating human and automated evals to ensure high AI model quality. • Proficient in big data tools such as Apache Spark and Hadoop. • Deep experience ...

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA · On-site

$113K - $155K/yr

... FastAPI, Django preferred). • Experience creating human and automated evals to ensure high AI model quality. • Proficient in big data tools such as Apache Spark and Hadoop. • Deep experience ...

Generalist

Software Engineer: Product

Somerville, MA · On-site

$90 - $120/hr

Typescript, React, FastAPI, Postgres, AWS * Understand how to expertly manage and leverage modern AI coding agents to accelerate development while maintaining high quality production standards About ...

New

Catalyst Labs

ML Engineer

Boston, MA · On-site

Preferred : • Familiarity with FastAPI, OpenAI APIs, Baseten, LiteLLM, LiveKit, PostgreSQL, Redis, and S3 is a plus. Company : Welcome to Catalyst Labs - Powering Catalytic Growth At Catalyst Labs ...

Motion Recruitment Partners, LLC

Senior Frontend Engineer

Natick, MA · On-site

$126K - $174K/yr

  • Medical

  • Dental

  • Vision

  • PTO

... FastAPI Experience improving performance and accessibility standards Familiarity with CI CD pipelines and development tooling Experience collaborating with distributed or global teams Interest in ...

Recorded Future

Principal Data Engineer

Boston, MA · On-site

$152K - $228K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

Flask, Django, FastAPI) * Architecting and delivering production-grade applications and ETL/ELT pipelines * Applying statistical techniques to draw accurate, impactful conclusions * Leadership ...

Farsyt

Founding Software Engineer

Cambridge, MA · On-site

$120 - $170/hr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Technical Stack Python (Django/DRF, FastAPI), React/TypeScript, PostgreSQL, Redis, Celery, AWS, Gemini/OpenAI/Anthropic APIs, Pydantic AI/LangChain, Docker You don't need experience with everything ...

Farsyt

Founding Software Engineer

Cambridge, MA · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Technical Stack Python (Django/DRF, FastAPI), React/TypeScript, PostgreSQL, Redis, Celery, AWS, Gemini/OpenAI/Anthropic APIs, Pydantic AI/LangChain, Docker You don't need experience with everything ...

Alumni Ventures

Senior Full-Stack Software Engineer

Boston, MA · On-site

$100 - $130/hr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Experience building backend services in Python (e.g., FastAPI) and TypeScript (e.g., Cloudflare Workers, Hono), including designing and consuming RESTful and GraphQL APIs. * Strong experience with a ...

Alumni Ventures

Full-Stack Software Engineer

Boston, MA · On-site

$90 - $120/hr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Experience building backend services in Python (e.g., FastAPI) and TypeScript (e.g., Cloudflare Workers, Hono), including designing and consuming RESTful and GraphQL APIs. * Familiarity with a ...

New

The Hollister Group

AI Developer

Boston, MA · On-site

$70 - $110/hr

Develop and maintain Python-based AI applications and APIs using frameworks like FastAPI, Flask, or LangChain. * Integrate observability and model monitoring solutions using Prometheus, CloudWatch ...

Redfish Recruiting

Proficiency in Python (FastAPI), TypeScript (Next.js), PostgreSQL, AWS, Docker. Experience with LLM APIs (e.g., GPT, Claude) and/or vector DBs (e.g., Pinecone) is a big plus. * Product Mindset

Farsyt

Founding Senior Software Engineer

Cambridge, MA · On-site

$133K - $176K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Technical Stack Python (Django/DRF, FastAPI), React/TypeScript, PostgreSQL, Redis, Celery, AWS, Gemini/OpenAI/Anthropic APIs, Pydantic AI/LangChain, Docker You don't need experience with everything ...

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Showing results 41-60

All JobsFastapi JobsFastapi Jobs in Massachusetts

Fastapi information

See Massachusetts salary details

$128.2K

$144.8K

$163.6K

How much do fastapi jobs pay per year?

As of Aug 19, 2026, the average yearly pay for fastapi in Massachusetts is $144,824.00, according to ZipRecruiter salary data. Most workers in this role earn between $137,315.00 and $150,188.00 per year, depending on experience, location, and employer.

What is a FastAPI?

A FastAPI job typically involves developing, maintaining, and optimizing web applications and APIs using the FastAPI framework. FastAPI is a modern, high-performance web framework for Python that is designed for building APIs quickly with automatic OpenAPI generation. Professionals in this role are expected to have experience with Python, asynchronous programming, and API development, often working with databases, authentication, and cloud services.

What are the typical daily responsibilities of a FastAPI developer?

As a FastAPI Developer, your daily tasks typically include designing and implementing RESTful APIs, writing efficient and maintainable code, and performing thorough testing to ensure reliability and performance. You may also collaborate closely with frontend developers, DevOps engineers, and QA teams to integrate new features and troubleshoot issues. Regular code reviews, documentation, and participation in agile development meetings are common parts of the workday. This collaborative and dynamic environment allows you to make a direct impact on the product while growing your skills through hands-on problem-solving and teamwork.

What are the key skills and qualifications needed to thrive in the FastAPI position, and why are they important?

To thrive as a FastAPI Developer, you need strong proficiency in Python, REST API design, and knowledge of web frameworks, ideally supported by a relevant degree or industry certifications. Familiarity with tools like Docker, Git, asynchronous programming, and testing frameworks such as Pytest is often required. Excellent problem-solving skills, adaptability, and clear communication are valuable soft skills in this role. These competencies ensure robust API development, seamless collaboration, and the delivery of high-quality software solutions in agile environments.

What are the most commonly searched types of Fastapi jobs in Massachusetts?

The most popular types of Fastapi jobs in Massachusetts are:

What are popular job titles related to Fastapi jobs in Massachusetts?

For Fastapi jobs in Massachusetts, the most frequently searched job titles are:

What job categories do people searching Fastapi jobs in Massachusetts look for?

The top searched job categories for Fastapi jobs in Massachusetts are:

Fastapi jobs near you
Infographic showing various Fastapi job openings in Massachusetts as of August 2026, with employment types broken down into 93% Full Time, 1% Part Time, and 6% Contract. Highlights an 73% Physical, 9% Hybrid, and 18% Remote job distribution, with an average salary of $144,824 per year, or $69.6 per hour.

Senior AI Engineer - Customer Agent

Klaviyo

Boston, MA • On-site

$113K - $155K/yr

Full-time

Re-posted 11 days ago

Job description

Job Summary:
Klaviyo is a company that empowers creators to own their destiny by making first-party data accessible and actionable. They are seeking a Senior AI Engineer to design and build scalable backend systems for their AI products and AI agent solutions, collaborating closely with product managers, machine learning engineers, and data scientists.
Responsibilities:
• Design and build backend systems that support scaling our AI solutions for 167K+ customers.
• Develop robust, reliable and scalable data collection and processing pipelines for machine learning models to train and consume.
• Develop robust, reliable and scalable services to serve AI models in production environments.
• Contribute to evolving our agentic architecture, making our AI agents more self-sufficient and performant.
• Contribute to a culture of ownership, experimentation, and customer-centric product thinking.
Qualifications:
Required:
• 5-7 years of professional experience in software engineering, with a strong focus on backend systems and distributed architectures.
• Have hands-on experience building and deploying generative AI and agentic AI applications into production, with expertise in prompt engineering, few-shot learning, fine tuning and evaluation.
• Experienced backend engineer with a strong track record of building scalable, distributed systems, especially in the service of AI agent capabilities.
• Proficient in Python and modern backend frameworks (FastAPI, Django preferred).
• Experience creating human and automated evals to ensure high AI model quality.
• Proficient in big data tools such as Apache Spark and Hadoop.
• Deep experience with asynchronous processing and distributed task queues (Celery, Kafka, SQS, RabbitMQ, Redis).
• Strong understanding of database technologies and ORMs (SQLAlchemy, Alembic).
• Comfortable with cloud-native architectures (AWS) and container orchestration (Kubernetes); can manage infrastructure and CI/CD pipelines.
• Skilled at designing and building robust APIs.
• Able to operate with a high degree of autonomy, handle ambiguity, and thrive in a fast-moving, startup-like environment.
• Driven by curiosity. You're someone who learns and stays up to date with this rapidly evolving field.
• Comfortable collaborating directly with product managers and customers to shape solutions.
Preferred:
• Trained ML models in the past and deployed them in production systems to generate impact to businesses.
• Experience in reinforcement learning.
Company:
Klaviyo is an automation and email platform designed to help grow businesses. Founded in 2012, the company is headquartered in Boston, USA, with a team of 1001-5000 employees. The company is currently Late Stage.

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