Staff Software Engineer – Full Stack

Staff Software Engineer – Full Stack

Contentsquare

Paris or Barcelona

About the Role

As a Staff Software Engineer – Full Stack, you’ll be part of the Session analysis team, a cornerstone of Contentsquare’s platform. Session analysis enables teams to visually reconstruct user sessions and understand not just what users do, but why. It powers key use cases across product, design, support, and engineering—helping companies identify friction, reproduce bugs, and optimize user experience.

You’ll join a cross-functional squad of 8 engineers, including front-end, full-stack, and data profiles, working closely with product managers and designers. In this role, you’ll help scale a system that processes millions of user sessions per day, combining high-throughput event ingestion, real-time processing, and smart replay rendering—all while maintaining strict privacy and compliance standards.

What you will do

Technical Leadership

• Drive key technical initiatives and contribute to company objectives by taking ownership of major and complex topics within our products. Lead the architecture, development, and optimization of high-performance web applications, with a strong focus on scalability, observability, and runtime performance.

Engineering and Development

• Lead the technical design and delivery of robust front-end modules using Vue.js, React, and TypeScript, leveraging a micro-frontend architecture for scalable and modular application development. Develop and manage back-end components and APIs using Node.js, and push our microservices architecture forward to support large-scale data and low-latency needs.

Cross-Team Collaboration

• Work closely with agile, cross-functional teams, including engineers, product managers, designers. Provide focused support across units, driving improvements across the entire application tech stack, both front-end and back-end with a strong product-performance mindset.

Mentorship and Team Enablement

• Serve as a thought partner to engineering and product leadership. Mentor engineers through pair programming, code reviews, and day-to-day coaching.
• Foster a culture of technical excellence, knowledge sharing, and continuous improvement, helping the team adopt best practices and stay aligned on engineering goals.

Strategic Contributions

• Play a central role in long-term strategic planning, including system architecture, modularization, and cross-product technical alignment around transversal Initiatives. Actively contribute to internal tech circles, architectural reviews, and sharing sessions to spread insights and elevate our collective engineering standards. Contribute to the evolution of performance SLOs through improved observability and resilient system design.

What You’ll Need to Succeed

Expertise in Full Stack Development

• At least 10 years of professional experience with a solid foundation in software development.
• Proficiency in component-based architectures using modern frameworks like Vue.js, React, or Angular for the front-end, and extensive experience in Node.js, PostgreSQL, and AWS for the back-end and data layer.

Strong Front-End & Back-End Fundamentals

• Deep understanding of JavaScript, TypeScript, CSS, and HTML. Hands-on experience with single-page applications (SPA), cloud-native systems, microservices architecture, and performance optimization - particularly around key SLOs. Familiarity with automated testing practices and continuous delivery pipelines.

Leadership and Vision

• Demonstrated ability to lead engineering projects, make critical architectural decisions, and think holistically about product and platform. Ability to inspire others, drive a shared technical vision, and ensure the implementation of engineering best practices across the team.

Collaborative Spirit

• Excellent communication skills, with experience working cross-functionally in agile, mid-sized teams. You value transparency, respectful feedback, and a collaborative culture - and you actively help build it.

Nice to Have

• Exposure to Scala, Go, or Python in production environments.
• Experience with ClickHouse or other columnar databases for high-volume analytics.
• Contributions to open-source projects, tech talks, or engineering blogs.

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