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

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA · On-site

$113K - $155K/yr

They are seeking a Senior AI Engineer to design and build scalable backend systems for their AI ... FastAPI, Django preferred). • Experience creating human and automated evals to ensure high AI ...

Pryzm

Senior Software Engineer

Boston, MA · On-site

$130 - $190/hr

Backend expertise with modern frameworks such as Django, FastAPI, or Node.js, along with strong SQL ... Bonus experience with distributed systems, ETL/data pipelines, DevOps tooling (Kubernetes, Helm ...

New

Klaviyo

Senior AI Engineer - Customer Agent

Boston, MA · On-site

$113K - $155K/yr

They are seeking a Senior AI Engineer on the Customer Agent team to design and build scalable ... FastAPI, Django preferred). • Experience creating human and automated evals to ensure high AI ...

twenty80.io

Senior Full Stack Software Engineer

Boston, MA · 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 ...

Hatch IT

Senior Software Engineer

Boston, MA · On-site

$133K - $175K/yr

T. is partnering with Via to find a Senior Software Engineer. See details below: About the Role: An ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

Hatch IT

Senior Software Engineer

Boston, MA · On-site

$133K - $175K/yr

T. is partnering with Via to find a Senior Software Engineer. See details below: About the Role: An ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

Hatch IT

Senior Software Engineer

Boston, MA · On-site

$133K - $175K/yr

T. is partnering with Via to find a Senior Software Engineer. See details below: About the Role: An ... Developing RESTful APIs (using frameworks such as FastAPI) secured by OAuth2/Auth * Integrating ...

Klaviyo

Senior AI Engineer

Boston, MA · On-site

$113K - $155K/yr

They are seeking a Senior AI Engineer to design, build, and scale production-grade LLM integrations ... FastAPI, Flask, or Django) and TypeScript or JavaScript, with experience in modern frontend ...

Bristol Myers Squibb

Senior AI Engineer

Cambridge, MA

$114K - $156K/yr

Design, build, and deliver backend services and application components using Python/FastAPI ... DevOps, and Reliability: * Build and maintain CI/CD pipelines, infrastructure-as-code, automated ...

Klaviyo

Sr. Lead AI Engineer

Boston, MA · On-site

Job Title: Sr. Lead AI Engineer Location: Boston, MA This role is based in our Boston, MA hub ... Proficient in Python and modern backend frameworks (FastAPI, Django or similar), with experience ...

Klaviyo

Sr. Lead AI Engineer

Boston, MA · On-site

Job Title: Sr. Lead AI Engineer Location: Boston, MA This role is based in our Boston, MA hub ... Proficient in Python and modern backend frameworks (FastAPI, Django or similar), with experience ...

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 ...

Klaviyo

Senior AI Application Engineer

Boston, MA · On-site

They are seeking a Senior AI Application Engineer to design, build, and scale production-grade LLM ... FastAPI, Flask, or Django) and TypeScript or JavaScript, with experience in modern frontend ...

Klaviyo

Sr. Lead AI Engineer

Boston, MA · On-site

Job Title: Sr. Lead AI Engineer Location: Boston, MA This role is based in our Boston, MA hub ... Proficient in Python and modern backend frameworks (FastAPI, Django or similar), with 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 Aug 8, 2026, the average hourly pay for senior fastapi developer in Malden, MA is $64.38, according to ZipRecruiter salary data. Most workers in this role earn between $54.66 and $72.21 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?

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 job categories do people searching Senior Fastapi Developer jobs in Malden, MA look for? The top searched job categories for Senior Fastapi Developer jobs in Malden, MA are:
What cities near Malden, MA are hiring for Senior Fastapi Developer jobs? Cities near Malden, MA with the most Senior Fastapi Developer job openings:
Senior Fastapi Developer jobs near you

Senior AI Engineer - Customer Agent

Klaviyo

Boston, MA • On-site

$113K - $155K/yr

Full-time

Re-posted 3 hours 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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