Senior Fullstack Engineer (Node.js/AWS/AI-Native) - Portugal Full Remote

About this role

Senior Fullstack Engineer (Node.js/AWS/AI-Native) - Portugal Full Remote
ABOUT THE OPPORTUNITY
Are you an engineer who already builds with AI coding agents every day? We’re looking for an AI-native Senior Fullstack Engineer to own the design, build and scaling of production-grade software for a well-established UK digital retail and financial services company. AI tools are a core part of this role, not an occasional extra. You’ll use Claude Code, Cursor and similar agents to plan, build, test, debug and ship high-quality software quickly, and you’ll stay fully accountable for every line that goes to production.
PROJECT & CONTEXT
Our client is a recognised UK player in retail, payments, credit, fraud and financial services. The business is in the middle of a major technology transformation and is investing heavily in modern cloud platforms and AI-driven development.
You’ll work mainly with Node.js, TypeScript and AWS, building backend services and integrations across commercial platforms, payments, fraud, originations and financial infrastructure. Your work will cover:

• Designing and maintaining scalable, secure backend services and REST APIs

• Integrating third-party platforms and SaaS solutions

• Deploying, monitoring and scaling applications on AWS

• Reviewing and validating AI-generated code for security, performance and maintainability

• Refactoring and modernising existing services

• Building automated testing, CI/CD pipelines and observability

• Troubleshooting production issues

You’ll take requirements through to production with minimal supervision and work alongside technical and business stakeholders on UK business hours.
WHAT WE’RE LOOKING FOR (Required)

• Significant commercial experience in a senior, hands-on software engineering role

• Strong hands-on experience with Node.js, building and maintaining production-grade backend applications

• Strong proficiency in JavaScript and/or TypeScript

• Practical experience designing, deploying and maintaining applications on AWS

• Solid backend engineering skills, including API development, system integration and software architecture

• Experience with databases, data modelling, automated testing, CI/CD and Git

• AI-native development workflow, with daily use of Claude Code, Cursor, GitHub Copilot or similar tools

• Experience using AI agents across the whole SDLC: planning, implementation, debugging, refactoring, testing and delivery

• Ability to review, debug and secure code, including AI-generated code

• Proven ability to work independently, own delivery and make sound technical decisions

• Availability to work UK business hours

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Languages: Fluent English, written and spoken (mandatory)

NICE TO HAVE (Preferred)

• Experience in fintech, payments, fraud, credit or other regulated environments

• Experience integrating third-party SaaS platforms and external APIs

• Experience with cloud-native architectures, distributed systems and production operations

Compensation: €2,600 – €3,500/month net, depending on experience and seniority level.
Why HumanIT people stay (4.4 Glassdoor, 89% recommend)

• 15th month salary

• Health insurance covering your family

• Birthday off

• Mobility program for digital nomads

• Real work-life balance

Full benefits:
What it’s really like:
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