Medior Software Developer

EasyPost is looking for a hands-on Mid-level Software Engineer to help build and operate our secure document-delivery platform. Our customers use EasyPost to send invoices and business documents through channels such as Peppol e-invoicing, Belgian eBox, electronic registered delivery, e-signing, email and print. Behind this experience is a large event-driven AWS platform that processes sensitive documents, integrates with external providers and coordinates long-running delivery workflows. Your role You will develop features across our TypeScript backend and AWS serverless platform, from implementation and testing through deployment and production support. This role focuses on frontend, backend and cloud engineering. You will work closely with senior engineers, our team lead, product management and other developers to turn business requirements into secure, reliable and maintainable solutions. You will take ownership of clearly scoped features while continuing to strengthen your knowledge of cloud architecture, distributed systems and production operations. What you will do Develop and maintain TypeScript services, AWS Lambda functions and NestJS APIs. Build and update serverless infrastructure using AWS CDK. Turn business requirements and technical designs into working software. Contribute to technical designs and architectural discussions with support from senior engineers. Build event-driven workflows that correctly handle retries, duplicate events, timeouts and partial failures. Integrate with external e-invoicing, e-delivery and e-signing providers through APIs and webhooks. Work with AWS services such as Lambda, DynamoDB, EventBridge, SQS, Step Functions, API Gateway, S3 and CloudWatch. Apply established security practices for encryption, permissions, credentials, audit logging and sensitive data. Write unit, integration and end-to-end tests using Jest. Monitor services in production and investigate issues in application code, AWS infrastructure and external integrations. Participate in code reviews and apply feedback to improve code quality and maintainability. Contribute to improvements in our development, CI/CD and deployment processes. Collaborate with frontend engineers to deliver complete and reliable user journeys. Share knowledge with colleagues and gradually take ownership of larger and more complex features.