May 18, 2026

Senior Backend Engineer

Senior • Remote

Gliwice, Poland

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

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Warsaw, Poland

120 - 140 USD

🏢 Summary: Senior Backend Engineer role focused on designing and delivering scalable, production-ready software using Node.js and AWS. The position involves leading development of complex solutions, ensuring high performance, reliability, and security, and integrating monitoring and testing practices. The engineer collaborates in agile teams to translate product requirements into resilient cloud-based applications. 🗂️ Requirements: Strong experience with Node.js and TypeScript, Proficiency with AWS services (Lambda, SNS/SQS, API Gateway, CDK), Experience with TDD and QA best practices, Ability to design and build highly scalable applications, Experience with monitoring, performance, scalability, and security, Experience conducting code reviews and delivering production-ready code, Ability to integrate monitoring and support tools, Experience contributing to test frameworks 📃 Skills: Node.js, TypeScript, AWS, Lambda, SNS, SQS, API Gateway, CDK, TDD, QA, Monitoring, Scalability, Security, Agile 🏢 Description: We are looking for a Senior Backend Engineer (Node.js / AWS) who: Has strong experience with TDD and solid understanding of QA best practices. Can handle operational challenges : monitoring, performance, scalability, availability, resilience, and security. Translates product requirements into reliable, scalable software . Has excellent development skills and experience building highly scalable applications . Is proficient in Node.js, TypeScript , and AWS services like Lambda, SNS/SQS, API Gateway , and CDK . What you’ll do: Lead development of complex software solutions. Conduct code reviews and deliver production-ready code . Integrate software with monitoring/support tools . Collaborate with architects and technical leads, participate in agile processes . Contribute to test frameworks , troubleshoot issues, and ensure smooth team collaboration.