Stefan Zimmermann

Overview

Senior Engineering Manager at Delta Bio, focused on payments infrastructure. Took payment success rates from 92.4% to 98.1%. Most at home with distributed systems and Go.

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Experience

1. Senior Engineering Manager

   Feb 2024 - Present
   Delta Bio · 2 yr 8 mo · Contract · Berlin, Germany
   • Moved 77% of payments platform traffic off a legacy monolith without a customer-facing incident.
   • Built the experimentation framework 22 product teams use to ship changes safely.
   • Led the migration of 24 services to idempotency.
2. Senior Backend Engineer

   Jun 2022 - Feb 2024
   Deloitte · 1 yr 8 mo · Full-time · Berlin, Germany
   • Took payment success rates from 95.6% to 96.7%.
3. Engineering Manager

   Jul 2020 - Jun 2022
   Supercell · 1 yr 11 mo · Full-time · Berlin, Germany
   • Brought on-call pages for payments platform down from 19 a week to 3.
   • Moved 62% of payments platform traffic off a legacy monolith without a customer-facing incident.
4. Senior Backend Engineer

   Jul 2018 - Jul 2020
   Celonis · 2 yr · Full-time · Berlin, Germany
   • Mentored 12 engineers through their first promotion.
   • Wrote the Go service that now handles 60 million requests a day.
5. Senior Backend Engineer

   Jan 2016 - Jul 2018
   IKEA · 2 yr 6 mo · Full-time · Berlin, Germany
   • Cut p99 latency on the payments platform services from 607ms to 148ms.

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Education

1. Bocconi University

   BSc, Computer Engineering
   2008 - 2011