Senior Backend Engineer

Cheerz.com

full-time

Posted on: 9/30/2025

Location Type: Hybrid

Location: Barcelona • 🇫🇷 France

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Job Level

Senior

Tech Stack

AWSAzureCloudGoGoogle Cloud PlatformNode.js

About the role

Take ownership of products, especially ads bidding and user segmentation
Collaborate with Backend, Frontend & Data Engineers, SREs, and Product Managers to enhance the platform
Improve performance and migrate or redesign outdated services
Ensure high-quality, maintainable code with strong test coverage
Promote development best practices: peer code review, continuous integration, rapid deployment
Select appropriate tools and technologies for reliability and efficiency
Manage technical debt while addressing daily scaling challenges
Keep a focus on technical and business scalability to minimize technical debt

Requirements

Strong experience with NodeJS or Go
Worked on large-scale systems, service-oriented architecture, or caching systems (in-memory, distributed)
Experience with high-performance and/or low-latency systems
Understand stream processing architectures
Experience maintaining or operating production systems
Knowledge of at least one public cloud platform (AWS, Azure, or GCP)
Ability to write code that is easy to test and consistent
Focus on scalability and reducing technical debt
Skilled at diagnosing and resolving production issues
Thrive in collaborative environments and communicate technical vision
Applicants must maintain residency and be legally authorized to work in France or the European Union
Position not open to B2B/freelance collaboration; expects permanent/full-time contract

Benefits

Competitive Salary
Performance-based Quarterly bonus with transparent KPIs
Longevity bonus every 2 years
4 1/2 days work week (Fridays afternoon off)
“RTT”
Mental Health support
Flexible remote working policy
Regular team-life event / activity
Inclusive parental leave Policy
Most benefits available to all employees; remote team members outside France receive benefits aligned with local laws

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills

NodeJSGoservice-oriented architecturecaching systemshigh-performance systemslow-latency systemsstream processing architecturesproduction systemspublic cloud platformsscalability

Soft skills

collaborationcommunicationproblem-solvingdiagnosing issuesresolving production issuesfocus on technical visionownershipadaptabilityteamworkattention to detail