Principal Backend Engineer

Qonto; Barcelona; Presencial; EUR 120.000 - 180.000; Jornada completa

Descripción de la vacante

Qonto in Barcelona, Spain is seeking a Principal Backend Engineer to lead scale initiatives across Foundations domain. You will own end-to-end backend architecture for high-volume transactions, search, and monetization, partnering with Legal, Risk, and leadership to translate technical bets into business outcomes.

You'll mentor engineers, drive AI-native integrations, and shape the roadmap with autonomous, cross-team collaboration, delivering robust platforms that power millions of customers

Formación

• Experience designing and scaling high-volume backend systems.
• Proven ability to lead multi-team initiatives with business impact.
• Comfort working in ambiguous environments and driving initiatives without explicit directions.
• Experience mentoring engineers and enabling teams through programs and documentation.
• Familiarity with AI tools and AI-native integrations in software platforms.

Responsabilidades

• Anticipate and solve scale challenges across Foundations' core systems.
• Lead end-to-end programs spanning multiple teams and stakeholders.
• Identify investments for Foundations and translate bets into technical roadmaps.
• Mentor engineers and raise the bar for technical excellence.
• Bridge business goals with backend decisions and communicate clearly to execs.

Conocimientos

Large-scale backend architecture

Technical leadership

Autonomous by default

Mentoring & enabling engineers

AI in workflow

Descripción del empleo

Our mission and customers: We are creating the freedom for SMEs to succeed by delivering Europe's leading finance workspace with banking at its core, augmented by financial tools. We are proud to be rated 4.8 on Trustpilot,based on 55,000+ reviews. Our cultureputs customer satisfaction at the core of what we do, as proven by our Net Promoter Score of 75 (more about our culture here). Our journey: Founded in 2017 by Alexandre and Steve, Qonto has grown to 1,600+ Qontoers serving over 600,000+ customers across 8 European countries. We have been profitable since 2023, and we are just getting started. Our beliefs: We hire for skills and potential. With 80+ nationalities, 45% women, of which 56% of women in our leadership team, diversity isn't a program; It's who we are. We've built a discrimination-free hiring process because the best teams are built on merit. AI at Qonto: AI is deeply embedded in how we work (here) - Every Qontoer gets unlimited access to the best AI tools. We want people who experiment without waiting for permission, push AI beyond the obvious, know when to trust it, and when to question it. Join us as Principal Backend Engineer in the Foundations domain and help scale the critical systems that power Qonto's 600,000+ customers — before they become bottlenecks. You'll drive company-wide backend initiatives spanning transactions, search, monetization, permissions, and integrations.

What you'll do

• Anticipate and solve scale challenges before they hit: You'll map technical risks across Foundations' core systems — ~600k daily transactions approaching 1B total, search indexing, billing — and drive the architectural work that keeps Qonto's growth ahead of its infrastructure.
• Lead broad, high-stakes technical initiatives: You'll own end-to-end programs spanning multiple teams, touching Legal, Risk, Compliance, and leadership, with real business consequences.
• Shape the platform's future: You'll identify where Foundations needs to invest next — from granular permissions to AI-native integrations — and translate those bets into technical roadmaps.
• Multiply the engineering org around you: You'll raise the bar for groups of engineers through mentoring, coaching programs, and technical enablement — not just one-on-ones.
• Bridge business goals and backend decisions: You'll connect company and customer needs to concrete technical plans and communicate them clearly to engineers and executives alike.

What we're looking for

• Large-scale backend architecture: You've designed and scaled high-volume systems — transactions, search/indexing, billing, or similar — under real growth pressure.
• Company-wide technical leadership: You've driven complex, multi-team initiatives that touched Legal, Risk, Compliance, and leadership, and you can tie every technical decision to a business outcome.
• Autonomous by default: You thrive in ambiguous environments, map ecosystems yourself, surface risks early, and propose initiatives without waiting for direction.
• Multiplier, not just contributor: You've raised the bar for groups of engineers through mentoring programs, documentation, or structured technical enablement.
• AI in your workflow: You use AI tools to accelerate how you architect, prototype, and communicate — and you're excited about what AI-native integrations could unlock for a platform like ours.

What we can offer you

• Scale Qonto's next chapter: Usage and data volumes are growing fast — you'll architect solutions before systems become bottlenecks, not after.
• The largest engineering domain at Qonto: Foundations spans ~110 backend engineers across internal tooling, monetization, integrations, transactions, permissions, and automation — it's genuinely Principal-scale scope.
• Complex, urgent, business-critical challenges: From search indexing trade-offs at 1B+ interactions to AI-native integrations, the technical problems here directly shape the product millions of customers use daily.
• Real ownership over technical direction: You'll identify what matters, propose the roadmap, and drive execution — with the autonomy to shape the domain's future.

Don't check every box? If you're excited by the scope and feel strongly about the mission, we'd love to hear from you anyway.

At Qonto, we understand that true diversity isn't just about ticking boxes on a hiring checklist. Apply regardless of the boxes you tick — who knows? You may have the missing piece of the puzzle we’ve been searching for all along.

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On average, our hiring process lasts 20 working days. More information on our candidate journey here.