Christian Frei

S

VP of Engineering at Signal Ops | ex-Philips

Signal Ops
Hamburg, Germany · CET (UTC+1)
10+ years experience
EPFL
English, German
Hiring
Messaging unavailable

Overview

28 years in software engineering, the last 1 at Signal Ops, where I lead the ML platform team. Led the migration of 28 services to Java. Reduced cloud spend on ML platform by 18% in two quarters. Before that: Philips and Trade Republic.

Good reasons to reach out
  • Candidates for the role I'm hiring for
  • Speaking or podcast invitations
  • Working sessions on Ray
  • Questions about ML infrastructure
Please don't message about
  • Requests to fix your code for free
  • Offshore staffing offers
Skills
KubeflowPythonJavaCUDAmodel servingRay
HiringHiring for a role
closes in 3 months

Looking for a frontend engineer who has worked on CUDA at scale

Role
Frontend engineer
Level
Mid
Type
Full-time
Work mode
Remote within country
Compensation
$129k-$173k
Team
ML platform, 13 people
Start
Within two months
Must have
Production experience with Python Production experience with Kubeflow Clear written communication
Process
Decision within 10 days

Comp €78k-€107k. We decide within ten days. Message me with one thing you shipped that you're proud of.

Hamburg, Germanyjavapythonray
Open

Experience

  1. VP of Engineering
    Mar 2026 - Present
    Signal Ops · 7 mo · Full-time · Hamburg, Germany
    • Brought on-call pages for ML platform down from 15 a week to 2.
    • Wrote the CUDA service that now handles 42 million requests a day.
    • Cut p99 latency on the ML platform services from 598ms to 97ms.
  2. Senior ML Engineer
    Aug 2023 - Mar 2026
    Philips · 2 yr 7 mo · Full-time · Hamburg, Germany
    • Taught SQL to 121 non-analysts.
    • Cut the time to a trustworthy experiment readout from 3 weeks to 3 days.
  3. Director of Engineering
    Oct 2021 - Jul 2023
    Trade Republic · 1 yr 9 mo · Full-time · Hamburg, Germany
    • Built the experimentation framework 26 product teams use to ship changes safely.
    • Cut p99 latency on the ML platform services from 502ms to 48ms.
  4. Senior ML Engineer
    May 2019 - Oct 2021
    Wolt · 2 yr 5 mo · Full-time · Hamburg, Germany
    • Taught SQL to 110 non-analysts.
    • Replaced 28 hand-built dashboards with one metrics layer people trust.
  5. Director of Engineering
    Mar 2017 - May 2019
    Capgemini · 2 yr 2 mo · Full-time · Hamburg, Germany
    • Wrote the Java service that now handles 71 million requests a day.
    • Cut p99 latency on the ML platform services from 357ms to 123ms.

Projects

ML infrastructure benchmark
2022

Reproducible benchmarks comparing Kubeflow and CUDA on real workloads.

References

No references yet.

Education

  1. EPFL
    MSc, Mathematics
    2001 - 2003
  2. Bocconi University
    BSc, Mathematics
    1995 - 1998

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