Lead Backend Engineer - Tech Evangelist

They are opening a new technical leadership role in their Barcelona hub. They are looking for a hands-on Senior or Lead Engineer who loves writing code and is just as eager to share knowledge, raise the technical bar and lead initiatives that affect the whole company. You’ll spend about half your time coding and the other half guiding 4–10 teams towards better technical decisions. This role has no people or budget management. Your impact comes from technical influence and evangelism.

Responsibilities

Hands-on engineering

* Build scalable, resilient backend services in Node.js and TypeScript (with some Rust) on AWS.

* Drive the evolution from microservices and legacy components to an event-driven, serverless architecture (Lambda, DynamoDB, SQS, SNS) while keeping complexity under control.

* Design integration strategies with third-party payment providers and commercial platforms.

* Write real production code, including outside your own domain when another team needs support.

Technical evangelism and company-wide initiatives

* Help define the technical direction of the Commerce platform in line with the long-term product vision.

* Act as the bridge between teams on cross-cutting problems, and help drive the engineering guilds and tech communities.

* Lead AI adoption in engineering: test what works (Copilot, spec-driven design, AI-assisted testing), share the trade-offs openly, and help other teams adopt it.

* Challenge the “why” before the “how”: make sure the teams are solving the right problem.

* Mentor engineers and favour solid solutions over trendy ones. Help teams reach good decisions instead of imposing them.

Requirements

* Solid experience as a Senior Engineer or Tech Lead, with a track record of influencing beyond your own team.

* Strong background building customer-facing web services with JavaScript, TypeScript and Node.js.

* 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 introducing AI-assisted engineering practices.

* Experience modernising or migrating complex systems.

* Fluent English (working language).

Nice to have: Rust, Python, React, experience in payments, checkout or subscription domains, a background in media or streaming, or experience running guilds or tech communities.

What is offered

* Permanent contract and 30 days of paid holiday

* Hybrid and flexible: 2 days a week in the Barcelona office (Tuesday is team day)

* One week per quarter in Stockholm with your peers

* A yearly Hack Week, and many of its projects make it into the product

* Private health insurance, a pension plan, flexible compensation and meal vouchers

* Free access to the streaming platform: sports, originals, films and live channels