Senior Platform Reliability Engineer — Remote & Stock Options

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

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.