Sophia Widmer

S

Senior Backend Engineer at Maersk · Payments infrastructure

Maersk
Berlin, Germany · CET (UTC+1)
4+ years experience
École Polytechnique
English, German, Hindi
Co-founder
Messaging unavailable

Overview

Currently at Maersk, where I work on payments infrastructure. Shipped a rewrite that took build times from 21 minutes to under 4. Most at home with Java and distributed systems. I host a monthly meetup on payments infrastructure.

Good reasons to reach out
  • People who want to build this with me
  • Working sessions on distributed systems
  • Speaking or podcast invitations
Please don't message about
  • Generic networking requests
  • Recruiters for roles outside my stack
  • Crypto token projects
Skills
PCI DSSJavaPostgreSQLgRPCdistributed systems
Co-founderLooking for a co-founder
closes in 3 months

Looking for a commercial co-founder for cold-chain monitoring for Indian SMBs

The idea
Cold-chain monitoring for Indian SMBs
Stage
Prototype
I bring
15 years in payments infrastructure
Looking for
Operator who has scaled a team
Commitment
Full-time now
Location
Berlin or remote

I bring 4 years of payments infrastructure (currently Maersk). Ideally you've run operations in Africa. Pre-product, some customer interviews done.

Berlin, Germany · remote OKpci dssgrpcpostgresql
Open

Experience

  1. Senior Backend Engineer
    Aug 2025 - Present
    Maersk · 1 yr 2 mo · Full-time · Berlin, Germany
    • Led the migration of 44 services to gRPC.
    • Moved 93% of payments platform traffic off a legacy monolith without a customer-facing incident.
    • Cut p99 latency on the payments platform services from 745ms to 85ms.
  2. Backend Engineer
    Oct 2022 - Aug 2025
    Doctolib · 2 yr 10 mo · Full-time · Berlin, Germany
    • Brought on-call pages for payments platform down from 21 a week to 4.
    • Designed the reconciliation system that matches 7 million transactions a day.

Projects

Open-source Java toolkit
2023

A small library for payments infrastructure that 48 developers star on GitHub.

References

No references yet.

Education

  1. École Polytechnique
    Ingénieur, Computer Engineering
    2018 - 2022

Details

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