Senior Backend Engineer (Innovate)

Business At Work; Paris; Sur place; EUR 60 000 - 85 000; Plein temps

Avantages offerts par ce poste

Competitive salary and equity

Flexible remote work policy

Great health insurance

Parental leave and daycare access

Résumé du poste

Business At Work is seeking a Senior Backend Engineer to join its innovative squad in Paris. The role focuses on designing and operating high-risk backend experiments within a fast-paced environment and requires 5+ years of backend experience, proficiency in Node.js and TypeScript, as well as collaboration skills.

Offering highly competitive salary and great health insurance, this position also provides a flexible remote work policy with team events.

Qualifications

• 5+ years of backend experience, ideally in startup/scale-up environments.
• Proficient in Node.js and TypeScript.
• Solid experience designing APIs with performance and security considerations.
• Experience with event-driven systems like Kafka or RabbitMQ.
• Strong engineering best practices including testing and code quality.
• Product mindset and collaborative skills.

Responsabilités

• Design and deliver backend capabilities for product bets.
• Build resilient, scalable systems adapted to high-risk experimentation.
• Strengthen best practices and mentor peers as needed.

Connaissances

Backend experience

Node.js

TypeScript

API design

Event-driven systems

Engineering best practices

Product mindset

Clear communication

Outils

Datadog

Grafana

Kafka

RabbitMQ

NATS

Description du poste

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.