Senior Lead Backend Engineer – AWS/Node.js, Hybrid (Barcelona)

Q-tech; Barcelona; Hybrid; EUR 90,000 - 115,000; Full time

Benefits offered by this job

Permanent contract and 30 days of paid

Hybrid model with 3 days a week in the

Regular trips to Stockholm

Yearly Hack Week

Private health insurance

Flexible compensation

Meal vouchers

Job summary

Q-tech in Barcelona is seeking a hands-on Senior Engineer or Lead Engineer to shape the Commerce platform across sign-up, checkout, payments and subscriptions. You will write production code in Node.js/TypeScript (with some Rust) and influence cross-team decisions, mentoring others and driving technical initiatives.

This role offers a permanent contract, a hybrid model with three days in the Barcelona office, and regular trips to Stockholm to connect with peers; you’ll also benefit from a yearly

Qualifications

• Solid experience as a Senior Engineer or Tech Lead with influence beyond your team.
• Experience designing scalable cloud services on AWS, ideally serverless and event-driven.
• Experience with high-traffic, high-transaction consumer products.
• Ability to drive technical initiatives without formal authority.
• Hands-on experience with AI-assisted engineering practices.
• Experience modernising or migrating complex systems.

Responsibilities

• Build scalable, resilient backend services in Node.js and TypeScript (with some Rust) on AWS.
• Design integration strategies with third-party payment providers and commercial platforms.
• Write production code and support other teams when needed.
• Define the technical direction of the Commerce platform in line with the product vision.
• Mentor engineers and promote solid solutions over trendy ones.

Skills

Senior Engineer

Tech Lead

Technical influence

Mentoring

Tools

Node.js

TypeScript

Rust

AWS

Serverless

Event-driven

AI-assisted engineering

Job description

Q-tech in Barcelona is seeking a hands-on Senior Engineer or Lead Engineer to shape the Commerce platform across sign-up, checkout, payments and subscriptions. You will write production code in Node.js/TypeScript (with some Rust) and influence cross-team decisions, mentoring others and driving technical initiatives.

This role offers a permanent contract, a hybrid model with three days in the Barcelona office, and regular trips to Stockholm to connect with peers; you’ll also benefit from a yearly