Senior Site Reliability Engineer, Platform & Reliability (M/F/X)

Crossbeam; Paris; Hybrid; EUR 90,000 - 140,000; Full time

Benefits offered by this job

Health insurance

Meal vouchers

Remote work budget

Wellness stipend

Stock options

Job summary

Crossbeam is seeking a Senior Site Reliability Engineer to architect and own a scalable platform. You will design, implement and operate secure, reliable infrastructure, partnering with engineering to automate deployments and improve observability.

This role remains hands-on and deeply technical, with influence across a distributed team. You will lead architecture reviews, mentor engineers and drive improvements in CI/CD, security and performance.

Qualifications

• Deep experience running Kubernetes and Docker in production at scale.
• Strong expertise with AWS and complex cloud architectures.
• Infrastructure as Code experience with Terraform.
• Strong understanding of reliability, observability and production engineering.
• Experience designing and operating modern CI/CD environments, ideally with GitHub Actions.
• Production databases knowledge, particularly PostgreSQL and/or MongoDB.
• Strong understanding of infrastructure security practices.
• Ability to investigate complex problems across application, infrastructure and data layers.
• Experience owning infrastructure projects or migrations from design through production.
• Strong communication skills and the ability to influence technical decisions across Engineering.
• Experience mentoring engineers and leading technical initiatives without formal management authority.
• Professional working English in distributed or international environments.

Responsibilities

• Architect, build and evolve highly available, scalable and secure infrastructure.
• Take ownership of major Platform and Reliability initiatives, from technical assessment and architecture through to production.
• Provide technical leadership and mentorship across the Engineering organisation.
• Manage and continuously improve our core infrastructure around AWS, Kubernetes, Docker and Terraform.
• Work with Helm, FluxCD and Kustomize to improve deployment and infrastructure management.
• Partner with development teams to build and improve highly automated CI/CD pipelines, particularly with GitHub Actions.
• Strengthen observability and proactively identify reliability, performance and capacity issues.
• Troubleshoot complex production problems and participate in the on‑call rotation, incident response and post‑mortem analysis.
• Design and improve our infrastructure security practices and tooling.
• Work across a data ecosystem including PostgreSQL, OpenSearch, Redis and MongoDB.
• Interact with cloud and distributed systems including Confluent, Snowflake and Temporal.
• Drive automation, architectural reviews and continuous improvements across the platform.
• Build useful technical documentation, including runbooks, playbooks and architecture documentation.

Skills

Communication skills

English proficiency

Mentoring engineers

Influence without authority

Tools

Kubernetes

Docker

AWS

Terraform

GitHub Actions

OpenSearch

PostgreSQL

Redis

Job description

Senior Site Reliability Engineer, Platform & Reliability

Location: France

Reports to: Eric Schmidt

About Crossbeam

Most go-to-market teams are still running playbooks built for a different era. More cold outreach. More ads. More noise. Crossbeam was built on a different idea: the fastest path to revenue is often through the companies already connected to your customers.

Crossbeam is the platform that makes that possible. Companies use Crossbeam to securely compare CRM data with partners, revealing shared customers, overlapping prospects, and warm paths into deals. We're defining the category of ecosystem-led growth and giving revenue teams a fundamentally better signal for how to prioritize accounts, collaborate with partners, and win deals faster.

About The Role

We are looking for an experienced Senior Site Reliability Engineer to join our highly collaborative and distributed Engineering team.

This is a senior individual contributor role with broad technical ownership and significant influence across Engineering. Your mission will be to help design and evolve a platform that is reliable, scalable, secure and efficient, while raising the bar for SRE and cloud-native practices across the organisation.

We are looking for someone who wants to remain deeply hands‑on: someone who can design architecture, challenge technical decisions, automate at scale, investigate complex production issues and help other engineers make better technical decisions.

You don't need to become a manager to have significant impact here.

You Will

• Architect, build and evolve highly available, scalable and secure infrastructure.
• Take ownership of major Platform and Reliability initiatives, from technical assessment and architecture through to production.
• Provide technical leadership and mentorship across the Engineering organisation.
• Manage and continuously improve our core infrastructure around AWS, Kubernetes, Docker and Terraform.
• Work with Helm, FluxCD and Kustomize to improve deployment and infrastructure management.
• Partner closely with development teams to build and improve highly automated CI/CD pipelines, particularly with GitHub Actions.
• Strengthen observability and proactively identify reliability, performance and capacity issues.
• Troubleshoot complex production problems and participate in the on‑call rotation, incident response and post‑mortem analysis.
• Design and improve our infrastructure security practices and tooling.
• Work across a rich data and database ecosystem including PostgreSQL, StarRocks, OpenSearch, Redis and MongoDB.
• Interact with cloud and distributed systems including Confluent, Snowflake and Temporal.
• Drive automation, architectural reviews and continuous improvements across the platform.
• Build useful technical documentation, including runbooks, playbooks and architecture documentation.

You Need

We expect you to bring roughly 8 to 10+ years of experience in Site Reliability Engineering, Platform Engineering, DevOps or Infrastructure Engineering. More importantly, we are looking for technical depth and demonstrated ownership, rather than a specific number of years.

• Deep experience running Kubernetes and Docker in production at scale.
• Strong expertise with AWS and complex cloud architectures.
• Advanced Infrastructure as Code experience, particularly with Terraform.
• Strong understanding of reliability, scalability, observability and production engineering.
• Experience designing and operating modern CI/CD environments, ideally with GitHub Actions.
• Solid experience with production databases, particularly PostgreSQL and/or MongoDB.
• A strong understanding of modern infrastructure security practices.
• The ability to investigate complex problems across application, infrastructure and data layers.
• Experience owning significant infrastructure projects or migrations from design through production, with measurable outcomes.
• Strong communication skills and the ability to influence technical decisions across Engineering.
• Experience mentoring engineers and leading technical initiatives without relying on formal management authority.
• Professional working English and experience working in distributed or international environments.

Coding Matters

We don't expect expertise in every language or technology in our stack. We care much more about your ability to understand unfamiliar systems, go deep when necessary and learn quickly.

Nice To Have

Experience with some of the following would be valuable, but we don't expect you to tick every box:

• StarRocks
• OpenSearch
• Redis
• Confluent
• Snowflake
• Temporal
• CrowdStrike
• Tenable One

How We Work

We are a distributed Engineering organisation where autonomy, concise communication and technical excellence matter.

Our engineers are expected to understand the problems they own, challenge assumptions and make decisions rather than simply execute tickets.

We value people who can combine technical depth with pragmatism: engineers who know when to go deep, when to simplify and when the best engineering decision is not to add more technology.

This role offers significant technical scope and autonomy. It is particularly suited to an experienced engineer who wants to increase their technical impact without moving away from engineering into people management.

You'll Do Great If You

• Take ownership without waiting for permission
• Know when to go deep, when to simplify, and when not to add more technology
• Challenge assumptions with evidence and help others make better decisions
• Use AI as leverage to improve your work, not just describe that you're open to it
• Make the people around you more effective by being clear, reliable, and easy to work with

You'll Get

• Competitive compensation and stock options
• Health insurance with Alan
• Swile meal vouchers (10 EUR per working day, 50% covered by Crossbeam)
• Remote work support: 50 EUR monthly allowance, 200 EUR home office budget, and up to 50 EUR per week for a coworking space if you live outside Ile‑de‑France
• Annual wellness stipend of 1,000 EUR
• Collaborative teammates and a culture built on trust and accountability