Sanne deJong

Backend Engineer at Arcadia Financial · Payments infrastructure

Arcadia Financial

Amsterdam, Netherlands · CET (UTC+1)

1+ years experience

Humboldt University of Berlin

English, Dutch, French

Open to work

Messaging unavailable

Overview

I've spent 1 years on payments infrastructure, now at Arcadia Financial. Wrote the Java service that now handles 16 million requests a day.

Good reasons to reach out

Roles in payments infrastructure
Thoughtful intros to people in my field
Questions about payments infrastructure

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SEO and link-building offers
Requests to fix your code for free
Recruiters for roles outside my stack

Skills

GogRPCdistributed systemsidempotencyPCI DSSJava

Open to workLooking for a role

closes in 3 months

Backend Engineer roles in marketplaces - Amsterdam or remote

Target roles: Backend Engineer
Level: Senior
Industries: Fintech, Consumer apps
Work mode: Remote
Available: Immediately
Work authorization: Authorized to work in Netherlands
What I'm looking for: Hands-on work on distributed systems with room to mentor.
Not interested in: Night shifts

1 years in payments infrastructure. Strongest at Java and gRPC. Open to the right conversation.

Amsterdam, Netherlandsgrpcgopci dss

Open

Experience

Backend Engineer
Oct 2025 - Present
Arcadia Financial · 1 yr · Full-time · Amsterdam, Netherlands
- Took payment success rates from 92.7% to 97.1%.
- Shipped a rewrite that took build times from 43 minutes to under 4.
- Wrote the Java service that now handles 11 million requests a day.

Projects

Write-up: payments infrastructure in practice

2025

A long-form guide to payments infrastructure for people starting out.

References

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Education

Humboldt University of Berlin
BA, Information Technology
2022 - 2025

Details

Compensation expectations

What they are targeting for their next role.

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