Senior Backend Engineer
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About the role
As Yubo continues to scale and roll out its 2026 Tech organization, we’re launching a brand new Innovate squad focused on bold product bets and high-risk initiatives. We’re looking for a Senior Backend Engineer to join our Backend Experience team, reporting directly to an Engineering Manager.
Your role is to design, ship, and operate high-risk backend experiments that validate bold product bets while keeping systems resilient, scalable, and cost-efficient within a fast iteration cycle. It is not a maintenance role.
Responsibilities
- Design and deliver backend capabilities from specifications to production rollout/rollback of experiments and product bets. Define and instrument success metrics with cross‑functional partners. Iterate quickly based on experiment results (KPIs, dashboards, quantitative signals).
- Build resilient, scalable, and cost‑efficient systems adapted to high‑risk experimentation. Diagnose and fix complex production issues using logs, metrics, and observability tools. Anticipate operational impact (deployment, rollback, monitoring, cost).
- Strengthen team‑level best practices and reusable patterns. Contribute to documentation, RFCs, and internal usability of squad‑owned systems. Mentor peers through code reviews and pairing (mentorship is a plus, not mandatory).
Qualifications
- 5+ years of backend experience, ideally in startup/scale‑up environments.
- Proficient in Node.js and TypeScript.
- Solid experience designing APIs (performance, security, observability).
- Experience with event‑driven systems (Kafka, RabbitMQ, NATS).
- Strong engineering best practices (testing, code quality, resilience).
- Product mindset and close collaboration with Product.
- Clear communication and ability to explain complex technical topics to non‑technical stakeholders.
- Comfortable working in English in an international environment.
Nice to have
- Experience in scalable architecture design.
- Experience mentoring peers.
- Familiarity with RFC‑style structured decision‑making.
First 6 months expectations
- Ship at least one high‑risk, country‑scoped backend experiment end‑to‑end, including safe rollout/rollback and measurable success metrics.
- Establish lightweight, reusable experimentation patterns (instrumentation, dashboards, operability guardrails).
- Improve one systemic area revealed by experiments (reliability, performance, or internal usability) and drive measurable impact.
- Increase the squad’s ability to test bold ideas without compromising platform stability.
Technical environment / Tools
- Backend: Node.js & TypeScript
- Architecture: Event‑driven systems (Kafka, RabbitMQ, NATS)
- Databases: NoSQL, key‑value stores, relational databases
- Observability: Datadog, Grafana
- Practices: RFC processes, technical specs, structured decision‑making
What we offer
- Highly competitive salary range and equity in the company.
- Highly flexible remote work policy, 2 days at the office per month, with monthly team events.
- Great health insurance coverage for you and your family.
- Additional parental leave and access to nurseries and daycare facilities in France.
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