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Senior Fastapi Developer Jobs in Philadelphia, PA

Best Egg

Lead Engineer II - Backend (Python)

Wilmington, DE · On-site

$100K - $135K/yr

You will work closely with senior engineers, Product, and other backend and frontend teams to build ... Expertise with at least one major Python web framework (FastAPI preferred; Django or Flask also ...

Best Egg

Lead Engineer II - Backend (Python)

Wilmington, DE · On-site

$100K - $135K/yr

You will work closely with senior engineers, Product, and other backend and frontend teams to build ... Expertise with at least one major Python web framework (FastAPI preferred; Django or Flask also ...

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How much do senior fastapi developer jobs pay per hour?

As of Jun 25, 2026, the average hourly pay for senior fastapi developer in Philadelphia, PA is $62.29, according to ZipRecruiter salary data. Most workers in this role earn between $52.88 and $69.86 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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Lead Engineer II - Backend (Python)

Lead Engineer II - Backend (Python)

Best Egg

Wilmington, DE

Full-time

Posted 20 days ago

Job description

Best Egg, now part of Barclays, is a market-leading, tech-enabled financial platform helping people build financial confidence through innovative lending solutions and financial health tools. As a Barclays company, we combine the agility and customer focus of a fintech with the global reach, stability, and purpose of a leading financial institution—working together to create a better financial future for our customers and communities.


At Best Egg, you’ll find a culture grounded in our core values—putting people first, creating clarity, delivering with excellence —enhanced by Barclays’ commitment to integrity, inclusion, and long-term impact. Together, we empower our colleagues to challenge, innovate, and take ownership while making a meaningful difference in people’s financial lives.


With the strength of Barclays behind us, we offer expanded opportunities for growth, development, and career mobility across a global organization—while continuing to build the products and experiences that make Best Egg unique.


We’re looking for collaborative, curious problem-solvers who are excited to make an impact and grow with us.


We’re proud to be an equal opportunity employer committed to building a diverse and inclusive team.


The Lead Software Engineer II – Backend plays an important role in building and enhancing backend engineering solutions across the organization. This role focuses on designing and delivering reliable, high-quality Python services on AWS while contributing to technical discussions, improving engineering practices, and supporting team execution. You will work closely with senior engineers, Product, and other backend and frontend teams to build performant, maintainable, and scalable APIs, serverless functions, and containerized services.
What You Will Do

Technical Leadership & Delivery

  • Design, develop, and deliver high-quality backend Python services iteratively and incrementally.
  • Take ownership of key services and APIs—from hands-on coding through CI/CD, deployment to AWS, monitoring, and on-call support.
  • Contribute to backend observability using tools like Datadog for logging, metrics, distributed tracing, and alerting.
  • Participate in technical design discussions and contribute architectural insights, working with senior leaders to shape solutions.
  • Ensure software follows modern engineering practices, including clean code, testing, automation, and modern backend architecture patterns.
  • Support continuous improvement in code quality, reliability, performance, and developer experience.
  • Translate business requirements into clear technical tasks and help validate assumptions and approaches.
Qualifications & Experience

Technical Expertise

  • 3–7 years of professional backend software engineering experience.
  • Proficiency in Python at scale, including modern Python (3.13+), type hints, async/await, packaging, and a strong grasp of the standard library and the broader ecosystem.
  • Expertise with at least one major Python web framework (FastAPI preferred; Django or Flask also strong) and the patterns that make Python services reliable in production.
  • Strong hands-on experience with AWS, including building and operating production workloads on Lambda (serverless functions, event-driven architectures) and EKS (containerized services on Kubernetes).
  • Working knowledge of supporting AWS services such as API Gateway, SQS/SNS, S3, IAM, CloudWatch, and Secrets Manager.
  • Experience designing and building RESTful APIs
  • Working knowledge of PostgreSQL
  • Experience with Redis for caching, rate limiting
  • Experience with containerization (Docker) and Kubernetes fundamentals (deployments, services, scaling, troubleshooting).
  • Experience with CI/CD pipelines and modern release tooling; familiarity with GitHub Actions and Octopus Deploy is a plus.
  • Experience with unit, integration, and contract testing (pytest or similar).
  • Experience working within mature, legacy codebases and contributing to incremental modernization efforts.
What Success Looks Like

In the first 90 days

  • Own core services or features.
  • Deliver high-quality, production-ready code and contribute meaningfully to team goals.
  • Build strong working relationships within Engineering, Product, and partner teams.

In 6–12 months

  • Lead development of one or more services or features with increasing autonomy.
  • Help improve service performance, reliability, and scalability.
  • Support and elevate engineering practices through mentorship, code reviews, and process improvements.
Employee Benefits
Best Egg offers many additional benefits for our employees, including (but not limited to):
·       Pre-tax and post-tax retirement savings plans with a competitive company matching
program
·       Generous paid time-off plans including vacation, personal/sick time, paid short--
term and long-term disability leaves, paid parental leave, and paid company
holidays
·       Multiple health care plans to choose from, including dental and vision options
·       Flexible Spending Plans for Health Care, Dependent Care, and Health
Reimbursement Accounts
·       Company-paid benefits such as life insurance, wellness platforms, employee
assistance programs, and Health Advocate programs
·       Other great discounted benefits include identity theft protection, pet insurance,
fitness center reimbursements, and many more!
 
 
In compliance with the CCPA, Best Egg is fully committed to handling the personal information and data of employees and job applications responsibly with respect and due care. Review our CCPA Employee Policy  here