Principal Engineer

CoreWeave; Greater London; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Family-level medical and dental insurance

Generous pension contribution

Critical illness cover

Tuition reimbursement

Job summary

A leading tech company in Greater London is seeking a Principal Software Engineer to lead the architectural evolution of their platform. In this hands-on role, you will drive technical initiatives, mentor developers, and design scalable solutions. Ideal candidates have 12+ years of software engineering experience, expert-level Python skills, and deep expertise in distributed systems. The role offers competitive salary and family-level benefits, along with a culture focused on innovative disruption.

Qualifications

• 12+ years of software engineering experience with at least 2 years in principal/staff engineering roles.
• Hands-on experience with workflow orchestration tools like Temporal, Airflow, or Kubeflow.
• Proven track record of leading architectural transformations in growing companies.

Responsibilities

• Drive technical leadership and architecture, transitioning from monolithic to distributed architecture.
• Write production-quality Python code for critical platform components.
• Mentor mid-level developers and establish engineering best practices.

Skills

Expert-level Python development

Distributed systems architecture

Kubernetes production workloads

Workflow orchestration tools

Cloud platform expertise (AWS)

Data processing frameworks

Technical communication

Job description

What You’ll Do

The Monolith AI Engineering Team is responsible for building and scaling the core platform that powers the world’s most advanced engineering simulation and AI workflows. This team delivers the performant, reliable, and scalable foundation trusted by the world’s largest engineering companies.

About The Role

We’re seeking a Principal Software Engineer to lead the architectural evolution of our platform as we scale to meet growing demand from the world’s largest engineering companies. This is a hands‑on technical leadership role where you’ll drive critical architectural initiatives while mentoring our engineering team.

In This Role, You Will

• Drive technical leadership and architecture, transitioning from monolithic to distributed architecture and designing agentic‑ready solutions.
• Write production‑quality Python code for critical platform components, build and optimize distributed compute services, and implement reliable workflow orchestration patterns.
• Mentor mid‑level developers, establish engineering best practices, collaborate with product and business stakeholders, guide prioritization, and interview and onboard new engineers.

Who You Are

• 12+ years of software engineering experience with at least 2 years in principal/staff engineering roles.
• Expert‑level Python development skills with production experience at scale.
• Deep expertise in distributed systems architecture and Kubernetes production workloads.
• Hands‑on experience with workflow orchestration tools (Temporal, Airflow, Kubeflow, or similar).
• Cloud platform expertise: AWS required, Azure & GCP beneficial.
• Experience with data processing frameworks (Spark, Athena, Ray, or similar) and systems having ML Engineering and MLOps aspects.
• Proven track record of leading architectural transformations in growing companies.
• Excellence in technical communication and stakeholder management.

What We Offer

• Family‑level medical and dental insurance.
• Generous pension contribution, life assurance at 4× salary, critical illness cover.
• Employee assistance programme and tuition reimbursement.
• Competitive salary and a work culture focused on innovative disruption.

Export Control Compliance

This position requires access to export‑controlled information and eligibility to meet U.S. Government export regulations.

Equal Opportunity Statement

CoreWeave is an equal opportunity employer, committed to fostering an inclusive and supportive workplace. All qualified applicants and candidates will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information.