Senior Backend Engineer

Senior Backend Engineer (AWS Serverless) About the Role We’re looking for experienced Senior Backend Engineers to join a cloud modernisation project in the healthcare sector. The team is responsible for rebuilding and expanding a secure AWS-based platform, migrating selected Azure services, and delivering scalable integrations with Salesforce and other external systems. This is a hands-on engineering role focused on backend services, serverless infrastructure, and event-driven architectures. You’ll work closely with cloud engineers, platform teams, and stakeholders to deliver production-ready solutions under tight delivery timelines. The project includes both modernisation of existing systems and development of new integrations — this is not a greenfield environment. Contract Type: B2B Work Mode: 100% Remote Time Zone: CET/CEST (Poland) — occasional meetings after 18:00 Project Overview The client is operating in the medical industry and is currently modernising their cloud ecosystem to support secure and compliant data processing workflows. The engineering team will focus on: • Building AWS serverless services and APIs • Designing event-driven integrations with Salesforce • Migrating Azure-based components to AWS • Rebuilding repositories and CI/CD processes in GitLab • Delivering secure architectures aligned with SOC 2 and HIPAA standards Technology Stack Backend & Cloud • Python • TypeScript • AWS Lambda • API Gateway • Step Functions • EventBridge • SQS / SNS Data & Infrastructure • RDS • DynamoDB • S3 • AWS Secrets Manager • Terraform • GitLab CI/CD Integrations & Compliance • Salesforce REST API • Salesforce Platform Events • SOC 2 • HIPAA • Confluence • Jira Responsibilities Backend Engineering & Integrations • Build and maintain scalable serverless services on AWS • Design and implement Salesforce-to-EventBridge integration patterns • Develop secure architectures for client file transfer and data synchronisation • Create reusable integration standards for event-driven and bulk-processing workflows • Design and maintain RESTful APIs and asynchronous processing pipelines Migration & Platform Modernisation • Rebuild selected Azure Functions and Azure Pipelines within AWS environments • Support repository migration and CI/CD transition to GitLab • Contribute to infrastructure and deployment automation using Terraform Engineering Quality & Delivery • Participate in code reviews and maintain production-grade engineering standards • Create and maintain technical documentation in Confluence • Work within agile delivery processes including daily standups, sprint reviews, and retrospectives • Collaborate closely with cloud engineers and platform stakeholders What We’re Looking For Required Skills & Experience • 4+ years of backend engineering experience • 2+ years working with AWS serverless technologies in production • Strong commercial experience with Python and/or TypeScript • Hands-on experience with:• AWS Lambda • API Gateway • EventBridge • SQS / SNS • Step Functions • Experience with RDS, DynamoDB, S3, and Secrets Manager • Terraform experience focused on application-level infrastructure • Experience integrating Salesforce APIs (REST and/or Platform Events) • Strong understanding of REST APIs and event-driven architectures • GitLab experience including CI/CD integration workflows • Familiarity with SOC 2 and/or HIPAA compliance requirements • Experience creating production-level technical documentation Nice to Have • Azure Functions or Azure Pipelines migration experience • Healthcare or medical-sector project background • Experience with ETL / ELT or bulk data processing pipelines • API test automation experience