Senior Backend Engineer (Node.js, AWS)

Capco Poland

Location: Poland
Job Type: full-time
Salary: Unknown
Posted: November 24, 2025

Job Description

ABOUT US

At Capco Poland, we’re not just another consultancy — we’re the spark behind digital transformation in the financial world. As a global leader in technology and management consulting, we thrive on helping clients tackle the toughest challenges across banking, payments, capital markets, wealth, and asset management.

Our secret?

A culture that’s fast, flexible, and fiercely entrepreneurial. We move quickly, think creatively, and always put our people first.

We’re passionate about growth — both for our clients and ourselves — and that means attracting the very best talent to join us on this exciting journey.

We’re proud to be:
• Trailblazers in banking, payments, capital markets, wealth, and asset management
• Champions of an agile, nimble, and innovative work environment
• Dedicated to building a team of top-notch professionals who share our drive and vision

THE BIG PICTURE

We're a forward-thinking financial technology team that’s reimagining how millions of people interact with their money. From real-time payment platforms to intelligent data-driven services, we're building the next generation of digital financial experiences.

Our environment combines the reliability and scale of an established organization with the creativity and agility of a startup.

You’ll be part of a culture that values collaboration, experimentation, and continuous learning — where every line of code you write has real impact.

And we’re just getting started.

HOW YOU WILL MAKE MAGIC HAPPEN

Building and maintaining backend services using Node.js and TypeScript — clean, efficient, and built to scale
Designing and implementing RESTful and/or GraphQL APIs that power great user experiences
Working with a wide range of AWS services like Lambda, S3, and DynamoDB to bring our ideas to life in the cloud
Teaming up with frontend developers, DevOps, QA, and product folks to bring features from concept to reality
Joining in on architecture conversations and helping shape the technical direction of the project
Writing code that’s clean, well-tested, and easy for your teammates (and future you) to understand

WHAT MAKES YOU AWESOME

You’ve got 5+ years of experience building backend systems in a professional setting
You're comfortable working with Node.js and TypeScript — and maybe even enjoy it!
You’ve spent time in the AWS ecosystem, especially with tools like Lambda, API Gateway, S3, and DynamoDB
You have a good grasp of API design and how to build systems using a microservices architecture
You know your way around Git, and you’re familiar with CI/CD pipelines to keep things running smoothly
Writing unit and integration tests is second nature to you — you like knowing your code is solid

WHY JOIN CAPCO?

Possibility to work remotely
Speaking English on daily basis, mainly in contact with foreign stakeholders and peers
Multiple employee benefits packages (MyBenefit Cafeteria, private medical care, life-insurance)
Access to 3.000+ Business Courses Platform (Udemy)
Access to required IT equipment
Paid Referral Program
Participation in charity events e.g. Szlachetna Paczka
Ongoing learning opportunities to help you acquire new skills or deepen existing expertise
Being part of the core squad focused on the growth of the Polish business unit
A flat, non-hierarchical structure that will enable you to work with senior partners and directly with clients
A work culture focused on innovation and creating lasting value for our clients and employees

ONLINE RECRUITMENT PROCESS STEPS*

Screening call with the Recruiter
Technical interview with Hiring Manager @ Capco
Client Interview
Feedback/Offer

🎯 Who is this job for?

This role suits a Senior Backend Engineer with 5+ years of experience in Node.js, TypeScript, and AWS (Lambda, S3, DynamoDB), ideally familiar with microservices architecture and building scalable APIs (REST/GraphQL). You should be confident writing clean, testable code, collaborating cross-functionally, and contributing to architecture decisions. Perfect for someone in Poland seeking a hybrid role in a fintech consultancy with a dynamic, innovation-driven culture.

💬 Potential Interview Questions

What are the advantages of using TypeScript over JavaScript in backend development?
TypeScript offers static typing, better IDE support, early error detection, and improved code maintainability.
How do you design a scalable REST API with Node.js and AWS Lambda?
Use stateless functions, split logic by endpoints, apply pagination, rate limiting, and handle errors via API Gateway mapping.
Explain the difference between AWS S3 and DynamoDB.
S3 is for object storage (files), DynamoDB is a NoSQL key-value and document database for structured data.
How would you implement error handling in a serverless microservice using AWS Lambda?
Use try/catch blocks, structured logging, and centralized error tracking tools like CloudWatch or Sentry.
Describe your CI/CD pipeline setup for a Node.js backend hosted on AWS.
Use GitHub Actions/GitLab CI, run tests/lint, build, deploy to Lambda via SAM/Serverless Framework, monitor via CloudWatch.
How do you ensure reliability and performance of APIs built with Node.js?
Use load testing, caching, proper logging, graceful error handling, circuit breakers, and rate limiting.
What is your approach to testing in Node.js applications?
Write unit tests with Jest, integration tests for API endpoints, mock services, and use test coverage reports.
How do you manage secrets and environment variables in AWS?
Use AWS Secrets Manager or Parameter Store with IAM roles, never hard-code secrets.
Explain your understanding of microservices architecture.
Microservices are independent services communicating via APIs; they allow modular scaling, isolation, and faster deployments.
How do you collaborate with frontend and DevOps teams during feature development?
Hold sync meetings, define API contracts early, use shared documentation, version APIs, and provide mocks for frontend teams.

📋 Job Summary

Capco Poland is hiring a Senior Backend Engineer with Node.js, TypeScript, and AWS expertise to build scalable microservices for fintech solutions. You'll work on REST/GraphQL APIs, AWS Lambda, S3, and DynamoDB in a collaborative, product-focused environment. This hybrid role is open to candidates based in Poland. Requirements include 5+ years of backend experience and solid CI/CD and testing practices. Capco offers remote flexibility, English-speaking teams, Udemy access, private medical care, and more. Join a fast-paced, innovative consultancy transforming the financial industry.