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Senior Fastapi Developer Jobs in Boston, MA (NOW HIRING)

Farsyt

Founding Senior Software Engineer

Cambridge, MA · On-site

$133K - $176K/yr

Strong backend engineering skills -- you've built and scaled real systems (we use Python, but care ... Technical Stack Python (Django/DRF, FastAPI), React/TypeScript, PostgreSQL, Redis, Celery, AWS ...

Via

Senior Software Engineer

Somerville, MA · On-site

$133K - $176K/yr

An impressive mission requires an equally impressive Senior Software Engineer. As a key technical ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

VIA

Senior Software Engineer

Somerville, MA

$133K - $176K/yr

An impressive mission requires an equally impressive Senior Software Engineer. As a key technical ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

VIA

Senior Software Engineer

Somerville, MA · On-site

$133K - $176K/yr

An impressive mission requires an equally impressive Senior Software Engineer. As a key technical ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

Klaviyo

Sr. Manager, Orchestrate

Boston, MA

$137K - $181K/yr

As the Senior Engineering Manager for Orchestrate, you will lead multiple teams responsible for the ... Django/FastAPI or similar) * Experience with cloud infrastructure (AWS), DevOps practices, and ...

Klaviyo

Sr. Manager, Orchestrate

Boston, MA · On-site

$137K - $181K/yr

As the Senior Engineering Manager for Orchestrate, you will lead multiple teams responsible for the ... Django/FastAPI or similar) * Experience with cloud infrastructure (AWS), DevOps practices, and ...

Third Way Health

Senior QA Engineer

Cambridge, MA · On-site

... developer experience. Required skills and qualifications * 5+ years of software engineering or test ... pytest, FastAPI TestClient, Pydantic). * Demonstrated experience designing evaluation or ...

Klaviyo

Senior AI Application Engineer

Boston, MA · On-site

We are looking for a Senior IT App Engineer to design, build, and scale production-grade LLM ... Strong full-stack engineering skills across Python (FastAPI, Flask, or Django) and TypeScript or ...

Klaviyo

Senior AI Application Engineer

Boston, MA

We are looking for a Senior IT App Engineer to design, build, and scale production-grade LLM ... Strong full-stack engineering skills across Python (FastAPI, Flask, or Django) and TypeScript or ...

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA · On-site

$113K - $155K/yr

Our team is looking for a Sr. AI Engineer on the Customer Agent team, Klaviyo's AI-native ... Proficient in Python and modern backend frameworks (FastAPI, Django preferred). * Experience ...

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Senior Fastapi Developer information

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How much do senior fastapi developer jobs pay per hour?

As of Jun 21, 2026, the average hourly pay for senior fastapi developer in Boston, MA is $67.06, according to ZipRecruiter salary data. Most workers in this role earn between $56.92 and $75.19 per hour, depending on experience, location, and employer.

What does a Senior FastAPI Developer do?

A Senior FastAPI Developer designs, develops, and maintains backend web applications using the FastAPI framework in Python. They are responsible for building scalable APIs, optimizing performance, ensuring security best practices, and integrating with databases and external services. Senior developers also mentor junior team members, contribute to architecture decisions, and collaborate closely with front-end engineers and stakeholders to deliver robust software solutions.

What are some common challenges faced by Senior FastAPI Developers when scaling applications, and how can these be addressed?

Senior FastAPI Developers often encounter challenges related to managing high concurrency, optimizing API performance, and ensuring robust security as applications scale. To address these, it’s important to implement asynchronous programming practices, leverage efficient database queries, and utilize API gateways for better traffic management. Collaboration with DevOps and QA teams is also essential to automate deployments and monitor system health, ensuring smooth scaling and reliable user experiences.

What are the key skills and qualifications needed to thrive as a Senior FastAPI Developer, and why are they important?

To thrive as a Senior FastAPI Developer, you need deep expertise in Python, RESTful API design, and experience building scalable web backends, typically supported by a degree in computer science or related field. Familiarity with FastAPI, Docker, cloud platforms (such as AWS or Azure), and CI/CD tools is highly valued, along with proficiency in testing frameworks. Strong problem-solving, leadership, and communication skills help you collaborate effectively with cross-functional teams and mentor junior developers. These skills enable the delivery of robust, efficient, and maintainable APIs that support business goals and high user demands.
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Senior Fastapi Developer jobs near you

Founding Senior Software Engineer

Farsyt

Cambridge, MA • On-site

$133K - $176K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted yesterday

Be an early applicant

Job description

Company Description

Farsyt is an AI-native insurance services company reimagining how insurance is bought, sold and operated - using automation, data and AI from the ground up.

Small team, high ownership, fast pace, venture-backed. This role is for someone who wants to take real ownership, move quickly, and build systems that matter.

Role Description

You’ll work directly with the founders to build the core product from zero to one.

  • Architect and build core systems (backend, APIs, data models)

  • Design AI-powered workflows that replace manual operations

  • Integrate with fragmented, unreliable real-world systems (external tools, documents, communication layers)

  • Build production-grade automation systems powered by LLMs (reliability, evaluation, and failure handling matter)

  • Design and operate asynchronous, event-driven systems (queues, workers, long-running tasks)

  • Ship fast — from idea → production in days, not months

  • Make foundational technical decisions that define the company

There are no rigid specs. You’ll help define what gets built and how.

Qualifications

  • 5+ years building production systems

  • Strong backend engineering skills — you’ve built and scaled real systems (we use Python, but care more about depth than specific frameworks)

  • Experience with cloud infrastructure (AWS, GCP, or similar)

  • Experience building systems from scratch

  • Comfortable operating in ambiguity and moving quickly

  • Experience with modern AI tooling (LLMs, RAG, agent frameworks) and an understanding of making them reliable in production (evaluation, structured outputs, failure handling)

  • Strong systems thinking — you think beyond individual features

  • Product intuition — you care about what gets built, not just how

Bonus:

  • Experience with voice, email, or messaging systems

  • Familiarity with fintech, insurance, or regulated environments

We care more about how you think and build than specific tools.

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 here, but you should be comfortable working in production systems and picking up new tools quickly.

The Team

You’d be joining the founding technical team, with direct input into what gets built and how. The people who join now will shape the company in ways that won’t be possible later.

Why this role?

  • You’ll be one of the first engineers — your decisions will shape the company

  • Direct access to founders, no layers

  • Real problems, not toy demos

  • A massive, outdated industry ready to be rebuilt


Compensation

  • Competitive salary & equity

  • Benefits

    • PTO

    • Health/Dental/Vision

    • 401k

    • Relocation

Location

Cambridge, MA

In-office, 5 days/week — we believe early-stage teams build best in person.

Don’t meet every requirement?

If you’re excited about the role but don’t check every box, we still encourage you to apply. We’re open to candidates across a range of experience levels, including those who may be more senior than this role suggests.


We are an equal opportunity employer and value diversity at our company.