Senior Cloud Native Developer

We are seeking a Senior Cloud Native Developer to join our team building SIS Core, an internally developed, event-driven platform powered by AWS serverless technologies. In this role, you will work within an established codebase and set of engineering conventions, contributing to architecture, infrastructure, and end-to-end testing strategy for a complex distributed system.

Responsibilities

• Design, build, and maintain event-driven services running on AWS serverless infrastructure
• Contribute to architectural decisions and document design choices
• Develop and maintain infrastructure using Infrastructure as Code
• Ensure reliability, scalability, and operational excellence across services
• Write and maintain automated end-to-end tests
• Collaborate with other engineers to evolve platform capabilities and engineering standards
• Work independently with minimal supervision to make sound technical decisions and justify trade-offs
• Navigate and contribute to complex distributed systems
• Influence architectural direction, not just implement requirements

Requirements

• 6+ years of relevant professional experience, with strong expertise in Python as a primary development language
• Solid understanding of AWS architecture, including VPCs, networking fundamentals, and multi-account environments
• Knowledge of security and operational best practices and how AWS services integrate within larger systems
• Hands-on experience with AWS Lambda, event-driven application design, and production operation of serverless workloads
• Experience designing and operating systems using EventBridge, SQS, and SNS
• Understanding of asynchronous communication patterns and distributed system design principles
• Experience with AWS CDK, ideally in TypeScript, and comfort working with both Python and TypeScript
• Deep operational and architectural expertise in DynamoDB, including single-table design, access-pattern-driven modelling, GSIs, LSIs, capacity planning and capacity modes, Streams, TTL, and PITR
• Strong understanding of ACID vs. BASE trade-offs, eventual consistency, and consistency challenges in distributed systems, including implications for DynamoDB and event-driven architectures
• Experience designing and operating event-driven microservice architectures, including service boundaries, event contracts, and failure handling
• Ability to evaluate multiple design approaches, make informed architectural decisions, and clearly communicate and document trade-offs
• Experience with automated testing strategies, including end-to-end testing, and data modeling and validation tools such as JSON Schema and Pydantic
• English proficiency at B2 level or higher

Nice to have

• Familiarity with BDD frameworks such as Behave
• Background in OpenSearch development and operational experience
• Skills in application profiling and memory optimization
• Experience monitoring and operating high-volume, mission-critical systems
• Expertise in API design and implementation, including GraphQL

We offer

• We gather like-minded people:
• • Top tech minds driving innovation in AI, cloud and digital platform modernization
  • Supportive team and agile, startup-like culture
  • Hybrid by design mode and opportunity to work remotely within Poland
  • Chance to work abroad for up to 60 days annually
  • Business-driven relocation opportunities
• We provide growth opportunities:
• • Career development programs
  • Thought leadership, mentoring, soft skills and well-being programs
  • Certification (Anthropic, Gemini, GCP, Azure, AWS)
  • English classes
• We cover it all:
• • Stable pay
  • Participation in the Employee Stock Purchase Plan with a 15% discount
  • Benefits package (health insurance, multisport, shopping vouchers)
  • Referral bonuses up to $2,000
  • Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more
  • Corporate, social and well-being events
• Please, note:
• • Benefits listed above are available to employees only
  • We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually
  • We will reach out to selected candidates exclusively

EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.