Senior Backend Engineer - Integrations Platform

sunday; Paris; Hybride; EUR 80 000 - 120 000; Plein temps

Avantages offerts par ce poste

Competitive salary and equity

Remote-friendly culture

Global impact

Résumé du poste

Sunday is building the fastest, simplest way to pay in restaurants. We are seeking a Senior Backend Engineer to join the 3rd-party POS Integrations team, focusing on the platform layer that standardizes how Sunday interacts with the POS ecosystem.

You’ll own backend design and occasional front-end fixes, collaborate across product and support, and help ship end-to-end improvements with CI/CD, observability, and scalable architectures.

Qualifications

• Outcome-driven approach in fast, evolving contexts.
• End-to-end ownership from problem shaping to production.
• Lead by example with mentoring and standards alignment.
• Strong back-end proficiency in Java/Kotlin/Spring.
• Fluent in testing strategies for integrations.
• Performance analysis and observability-driven debugging.
• Able to make light front-end changes with React.
• Clear written and verbal communication.

Responsabilités

• Elevate stability and cohesion across integrations to deliver a unified, high-quality experience for merchants and guests.
• Lead architectural decisions for scalability, resilience, and maintainability (e.g., idempotency, retries with backoff, circuit breakers, DLQs, backpressure, rate limiting, graceful degradation).
• Pitch in beyond back-end when needed: small UI fixes in our admin/ops panels and light infra changes (pipelines, configs, IaC) to unblock delivery.
• Design clear API contracts and schemas (REST/gRPC) and evolve them safely over time with versioning and ADRs.
• Raise the bar on observability: define SLOs/error budgets, improve logs/traces/metrics (Datadog), add synthetic checks, and build actionable dashboards/runbooks.
• Own data correctness and reconciliation across eventually consistent, distributed systems (outbox/inbox patterns, deduplication, replays, CDC, re-sync jobs).
• Debug complex incidents end-to-end across our services and third-party vendors; drive root-cause analysis and long-term fixes; analyze and solve memory leaks and related issues.
• Partner with Product, Support, and Integrations/CS teams to turn real-world issues and merchant feedback into roadmap value.
• Mentor engineers and contribute to shared tooling, documentation, and Architecture Decision Records (ADRs).
• Ship fast, safely using CI/CD, feature flags, canaries, and incremental rollouts.

Connaissances

Java/Kotlin/Spring

Observability

Performance analysis

Frontend basics (React)

CI/CD

Mentoring/Leadership

Communication

Outils

Kafka

RabbitMQ

Datadog

Terraform

Helm

React

Description du poste

Sunday is building the fastest, simplest way to pay in restaurants. We are seeking a Senior Backend Engineer to join the 3rd-party POS Integrations team, focusing on the platform layer that standardizes how Sunday interacts with the POS ecosystem.

You’ll own backend design and occasional front-end fixes, collaborate across product and support, and help ship end-to-end improvements with CI/CD, observability, and scalable architectures.