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Senior Fastapi Developer Jobs in Princeton, NJ (NOW HIRING)

Spara, Inc

Senior AI Engineer

New York, NY · On-site

$180K - $230K/yr

Our engineering team is small and senior, and everyone has real influence on what we build and how ... FastAPI/Python, React/TypeScript, Postgres + pgvector, multiple foundation models (OpenAI ...

twenty80.io

Senior Full Stack Software Engineer

New York, NY · On-site +1

$160K - $210K/yr

About the Role A growing technology startup is hiring a Senior Full Stack Software Engineer to help ... Backend: Node.js (Express or NestJS) and/or Python (Django or FastAPI) * Databases: PostgreSQL ...

Scale Microgrid Solutions

Sr Software Engineer

New York, NY · On-site

$134K - $176K/yr

We are looking for a full-stack software engineer to build software to efficiently manage ... Architect and maintain high-performance backend services and APIs (FastAPI, PostgreSQL) to support ...

Qode

Senior SDET

New York, NY

$120K - $157K/yr

... product, and DevOps teams to translate requirements into robust test solutions. * Integrate ... Flask, FastAPI, React, SQLAlchemy, PostgreSQL, Redis * Splunk * XCUITest, Appium, TestNG-specific ...

Scale Microgrid Solutions

Sr Software Engineer

New York, NY · On-site

$134K - $176K/yr

We are looking for a full-stack software engineer to build software to efficiently manage ... Architect and maintain high-performance backend services and APIs (FastAPI, PostgreSQL) to support ...

Scale Microgrid Solutions

Sr Software Engineer

New York, NY · On-site

$134K - $176K/yr

We are looking for a full-stack software engineer to build software to efficiently manage ... Architect and maintain high-performance backend services and APIs (FastAPI, PostgreSQL) to support ...

Peraton

Senior AI/ML Software Engineer

Woodbridge, NJ

$146K - $234K/yr

Responsibilities Peraton Labs is seeking a Senior AI/ML Software Engineer to join the Labs Agentic ... Develop full-stack product features (FastAPI + React) that surface AI capabilities to users - from ...

PhysicsX

Senior Machine Learning Engineer

New York, NY · On-site

$114K - $157K/yr

Python, PyTorch, Pandas, fastAPI, Scipy, Kubeflow, among others. * Mentor and develop engineers and ... As a senior member of the team, you'll significantly influence our technical direction and will be ...

Peraton

Senior AI/ML Software Engineer

Basking Ridge, NJ · On-site

$146K - $234K/yr

Responsibilities Peraton Labs is seeking a Senior AI/ML Software Engineer to join the Labs Agentic ... Develop full-stack product features (FastAPI + React) that surface AI capabilities to users - from ...

Peraton

Senior AI/ML Software Engineer

Basking Ridge, NJ · On-site

$146K - $234K/yr

Responsibilities Peraton Labs is seeking a Senior AI/ML Software Engineer to join the Labs Agentic ... Develop full-stack product features (FastAPI + React) that surface AI capabilities to users - from ...

Lev

Senior Backend Engineer

New York, NY · On-site

The Role We are looking for a passionate problem solver to join our engineering team. In this role ... Have demonstrable experience building Python APIs in Flask or FastAPI.. * A desire to work in a ...

Peraton

Senior AI/ML Software Engineer

Basking Ridge, NJ

$146K - $234K/yr

Responsibilities Peraton Labs is seeking a Senior AI/ML Software Engineer to join the Labs Agentic ... Develop full-stack product features (FastAPI + React) that surface AI capabilities to users - from ...

Newcode.ai

Senior Fullstack Developer

New York, NY · On-site

$59.50 - $78.75/hr

The role You'll build features the whole way through: the FastAPI service and data work on the back, the React interface on the front. Most of what we build puts a language model in front of someone ...

Peraton

Senior AI/ML Software Engineer

Woodbridge, NJ

$146K - $234K/yr

Responsibilities Peraton Labs is seeking a Senior AI/ML Software Engineer to join the Labs Agentic ... Develop full-stack product features (FastAPI + React) that surface AI capabilities to users - from ...

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How much do senior fastapi developer jobs pay per hour?

As of Jul 5, 2026, the average hourly pay for senior fastapi developer in Princeton, NJ is $64.71, according to ZipRecruiter salary data. Most workers in this role earn between $54.95 and $72.60 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
Senior AI Engineer

Senior AI Engineer

Spara, Inc

New York, NY • On-site

$180K - $230K/yr

Full-time

Medical, Dental, Vision, PTO

Posted 11 days ago

Job description

About Spara
Spara is building AI agents that sell. Our agents engage buyers across chat, voice, and email, handling everything from qualifying leads to booking meetings to answering deep product questions. We work with companies ranging from fast-growing startups to large enterprises, and our product is working: customers like Rho are seeing step-change improvements in their sales pipeline within weeks of going live.
Sales technology is a massive market, and the shift to AI-native GTM motions is still early. We're building the company that defines how it plays out. We've raised $15M from Radical Ventures and Inspired Capital, backed by the founders of PyTorch and Google Cloud TPU, and Heads of Sales at Anthropic and OpenAI.
Our founders have done this before: David was co-founder and CEO of Triplemint, which he led to acquisition, and Zander was technical co-founder of Nomad Health (now post-Series D) and most recently led Platform at Hyperscience AI.
We're a 20-person team in downtown Manhattan building something that will be much bigger. Our engineering team is small and senior, and everyone has real influence on what we build and how we build it.
This Role
We're looking for an engineer who lives and breathes the current wave of AI. Someone who's building with agents outside of work, has opinions about the latest model releases, and wants to apply that energy to production systems used by large enterprises.
As a Senior AI Engineer at Spara, you will:
  • Build and iterate on the AI systems that power our agents across chat, email, voice, meeting assistants, and lead enrichment. We ship new agent capabilities regularly, and the surface area is expanding fast.
  • Work across multiple agentic systems, both customer-facing and internal. You won't be stuck on one thing.
  • Improve retrieval, ranking, and response quality in a system that handles real customer conversations every day. The feedback loops are tight and the stakes are real.
  • Contribute to how we evaluate and measure quality across the platform. We care a lot about evals and are investing heavily here.
  • Ship to production multiple times a day using a modern stack: FastAPI/Python, React/TypeScript, Postgres + pgvector, multiple foundation models (OpenAI, Anthropic), Google Cloud, Docker, GitHub Actions.
What We're Looking For
  • 4+ years of engineering experience with meaningful time spent working with LLMs and related technologies
  • At least one startup under your belt. You know what it's like to build fast with a small team and wear multiple hats.
  • Deep familiarity with the agentic AI landscape. You follow what's happening, you've tried the new tools, you have opinions.
  • Proven ability to ship ML/AI systems in production, not just prototypes
  • Strong software engineering fundamentals across the stack
  • You're excited about the messy, fast-moving parts of building an early-stage AI company
Nice to have:
  • Experience with retrieval systems, search, or NLP
  • Advanced degree in ML or a related field

Location & Work Schedule
Hybrid: 3 days per week in our office in downtown Manhattan (World Trade Center), with the option to work remotely on Wednesdays and Fridays.
Compensation & Benefits
  • Health, dental, and vision insurance
  • Flexible PTO
  • Collaborative environment with experienced engineers solving hard problems together
  • Real ownership over product direction from day one
  • In-office culture in NYC with flexibility for work-life balance

Apply