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Senior Fastapi Developer Jobs in New York (NOW HIRING)

Revin AI

Senior Software Engineer

New York, NY · On-site

$200K - $275K/yr

Senior Software Engineer Location: New York, NY (on-site, 5 days a week) Compensation: $200,000 ... You'll work end-to-end across a Python/FastAPI backend, a Next.js/TypeScript dashboard, and the ...

Lev

Senior Backend Engineer

Manhattan, NY · On-site

The Senior Backend Engineer will be responsible for developing and maintaining the core Flask API ... FastAPI. • Architect, design, and implement a plethora of features/products we have in the ...

Photon

Full Stack Python Developer - NJ

Somerville, NJ · On-site

Senior Full-Stack Engineer - Python & Angular We are looking for a Senior Full-Stack Engineer with ... Experience with Django, FastAPI, or Flask * Strong experience building REST APIs and microservices

ACI Infotech

Sr Python Backend Developer

Manhattan, NY · On-site

Python Backend Developer Hybrid for NYC Long term Contract Job Summary We are looking for an ... Work with frameworks such as Django, Flask, or FastAPI * Integrate third-party APIs and external ...

Hapiko

Senior+ Backend Engineer

Brooklyn, NY · On-site

... fastAPI services for device auth, user management, and webhook integrations. • Create secure ... DevOps mindset, comfortable deploying, monitoring, and scaling • Experience with GenAI/LLM ...

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Senior Fastapi Developer information

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 the key skills and qualifications needed to thrive as a Senior FastAPI Developer?

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.

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.

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Senior Fastapi Developer jobs near you
Infographic showing various Senior Fastapi Developer job openings in New York as of September 2026, with employment types broken down into 83% Full Time, 7% Part Time, and 10% Contract. Highlights an 81% Physical, 4% Hybrid, and 15% Remote job distribution.

Senior Software Engineer

New York, NY • On-site

Revin AI
See more jobs at Revin AIexternal

$200K - $275K/yr

Full-time

Medical, Retirement, PTO

Re-posted 19 days ago

Key responsibilities

  • Build and evolve LangGraph workflows that handle SMS and voice conversations for enterprise operators

  • Ship features end-to-end across a Python/FastAPI backend and a Next.js/TypeScript dashboard

  • Build the eval frameworks that catch agent regressions before they reach customers

Job description

Senior Software Engineer
Location: New York, NY (on-site, 5 days a week)
Compensation: $200,000-$275,000 + equity
Employment: Full-time
Department: Engineering
About Revin
At Revin, we're bringing AI to the built world. Millions of operators across
home services, construction, and remodeling have been overlooked by the last
wave of technology. We're building the system of intelligence that lets them
automate and scale revenue.
Today, over $2.3B in revenue runs on Revin, making us the #1 AI partner for
enterprise operators in this market. Our customers include Sears Home Services
($800M), Astara Capital ($700M), Del Air ($150M), Long Home Remodeling
($150M), ImproveIt Remodeling ($100M), Sage Home ($80M), and more.
We've raised $10M from Stellation Capital, 1Sharpe, Gokul Rajaram, Russ
Heddleston, Michael Werner, Tandem, Max Branzburg, and Marc Bhargava.
About the Role
We're hiring an Senior Software Engineer to build the production systems behind our
AI agents - the agents that handle SMS, voice, and email conversations on
behalf of $100M+ home-services operators. When our agent makes a mistake -
books outside hours, dispatches to the wrong zip code, promises a service the
business doesn't offer - it costs our customers real money. Your job is to
build the systems that prevent that.
This is a high-ownership role. You'll work end-to-end across a Python/FastAPI
backend, a Next.js/TypeScript dashboard, and the LangGraph workflows that
drive agent behavior. You'll partner directly with product, design, and
leadership, ship in production, and influence the direction of the platform.
What You Will Do
- Build and evolve LangGraph workflows that handle SMS and voice conversations
for enterprise operators
- Ship features end-to-end across a Python/FastAPI backend and a
Next.js/TypeScript dashboard
- Work in a multi-tenant Supabase/Postgres environment where every query is
account-scoped (RLS, JWT-based access)
- Build the eval frameworks that catch agent regressions before they reach
customers - we treat eval quality as a first-class engineering discipline
- Integrate with messy real-world CRMs (Salesforce, ServiceTitan,
LeadPerfection, AccuLynx) where the data is never clean
- Partner with the voice team on real-time agent behavior (LiveKit + OpenAI
Realtime)
- Optimize the omnichannel experience across SMS, voice, and email
Who You Are
- 4-8 years of full-stack experience shipping production software at a
startup, high-velocity SaaS, or AI-driven company
- Production LLM experience - you've shipped LLM-powered features that real
customers depend on, not just prototypes or internal tools
- Fluent in Python (FastAPI) and TypeScript (Next.js, React Query)
- Comfortable working in multi-tenant production systems - RLS, account-scoped
queries, JWT-based access
- Experience debugging APIs, tracing distributed issues, and working with
event-driven systems and unstructured data pipelines
- A continuous learner comfortable operating in ambiguity. You ship, learn,
and adapt.
- Customer-obsessed - you want to be close to the people using what you build
Bonus:
- LangGraph, LangChain, or other agent frameworks in production
- Real-time voice/audio work (LiveKit, Daily.co, Twilio Voice)
- Observability tooling for LLM systems (Langfuse, LangSmith, Helicone)
Don't Apply If
- You wait for instructions instead of taking initiative
- You want a predictable, low-ownership role. We move fast, ship in
production, and own outcomes end-to-end. If you're optimizing for
predictability, this won't be a fit.
- You're not excited about applying AI to the built world. There's no playbook
here. If you want a well-trodden path, this isn't the role.
Compensation and Benefits
- Base salary: $200,000-$275,000
- Equity: Competitive equity package
- Full-time, on-site in our NYC office, 5 days a week
- Significant upside through early ownership and career growth
Benefits:
- Unlimited PTO
- $0 cost medical
- 401k matching
- Lunch and dinner in office
- Gym membership stipend
- Clear Travel Pass
- Tech equipment of your choice
- Mentorship pairing with a Revin advisor/investor
- Relocation assistance

Apply