Senior Backend Engineer - Scalable FinTech APIs

Qonto; Paris; Sur place; EUR 90 000 - 140 000; Plein temps

Résumé du poste

Qonto in Paris is hiring a Backend Engineer to build the financial infrastructure that powers 600,000+ European SMEs. You will design high-throughput APIs, ensure real-time processing, and own prod reliability within a Kubernetes-based platform on AWS using PostgreSQL, Kafka and ELK.

Join a squad-driven culture that values upfront design, mentorship, and continuous improvement. English fluency and cross-team collaboration are essential.

Qualifications

• Strong backend engineering experience with large-scale web application architecture and real production constraints.
• You adapt quickly to similar technologies beyond our stack.
• You write tests, set up monitoring, and handle incidents methodically with root cause analysis.
• Ownership mindset: you track impact after release, flag regressions, and improve what’s in scope without being asked.
• Team player: fluent in English and able to collaborate with PMs, Designers, and other stacks.

Responsabilités

• Design, build, deploy, and maintain services handling real financial transactions, owning reliability in production.
• Co-own service architecture, resilience, and scalability with respect to Domain-Driven Design principles.
• Grow in technical leadership: lead design discussions, anticipate risks, and mentor less experienced engineers.
• Drive continuous improvement, from fixing flaky CI to running post-mortems and sharing learnings across the team.

Connaissances

Backend engineering

Go/Ruby stack

Cloud & Kubernetes

English fluency

Outils

Go

Ruby

Kubernetes

AWS

PostgreSQL

Kafka

ELK

Description du poste

Qonto in Paris is hiring a Backend Engineer to build the financial infrastructure that powers 600,000+ European SMEs. You will design high-throughput APIs, ensure real-time processing, and own prod reliability within a Kubernetes-based platform on AWS using PostgreSQL, Kafka and ELK.

Join a squad-driven culture that values upfront design, mentorship, and continuous improvement. English fluency and cross-team collaboration are essential.