Senior Python Engineer

About the role

Paychex is looking for a Senior Python Engineer to own end-to-end backend feature delivery on AWS serverless. The role also covers GraphQL APIs, distributed event-driven services, data models and storage, and mentoring other engineers.

Key responsibilities

• Deliver backend features with Python on AWS serverless (Lambda, API Gateway, SQS/SNS, EventBridge, Step Functions)
• Design, build and maintain clean, documented GraphQL APIs, with attention to schema, versioning, performance and security
• Architect scalable, resilient distributed and event-driven services, including third-party integrations, idempotency, retries and failure recovery
• Design and optimize data models and storage (DynamoDB, PostgreSQL/Aurora, S3) for integrity, query performance and cost
• Work with Product and the Design Agency on roadmaps, epics and stories, and collaborate on AI-powered features and intelligent automation
• Integrate with and improve the CI/CD pipeline (CircleCI, GitHub Actions) and infrastructure as code (Terraform, AWS CDK or CloudFormation)
• Drive backend standards for security, observability and reliability, and mentor engineers through design and code reviews

Required profile

• 5+ years of backend development experience focused on Python and AWS serverless
• Experience building and supporting distributed, event-driven systems and third-party integrations
• DevOps awareness: CI/CD, infrastructure as code, observability and rollback readiness
• Strong sense of production ownership, including deployment, monitoring and incident management
• Understanding of application security (authentication/authorization, IAM, secrets management, data protection)
• Experience leading product delivery and using AI-powered tools

Required skills

• Python and AWS serverless
• GraphQL and/or REST APIs at scale
• Relational and NoSQL databases, data modeling and performance tuning
• BDD, TDD, SOLID; strong testing and clean-coding mindset

What we offer

• Flexible work philosophy
• Company-paid private health, life and disability insurance
• Paid leave for illness, birth parents, non-birth parents, elder caregivers, marriage, adoption and bereavement
• Inclusive and accessible Employee Assistance Program (EAP)
• Christmas and Easter bonuses
• Learning platform with lessons in English