Lien Jansen

Senior Software Engineer, Société Générale - Elixir · low-latency systems · Go

Société Générale

Rotterdam, Netherlands · CET (UTC+1)

6+ years experience

École Polytechnique

English, Dutch

Open to work

Messaging unavailable

Overview

Currently at Société Générale, where I work on real-time systems. Moved 91% of real-time traffic off a legacy monolith without a customer-facing incident. Before that: Philips and Deloitte. Most at home with low-latency systems and Elixir. Home cook with strong opinions about biryani.

Good reasons to reach out

Roles in real-time systems
Second opinions on rate limiting decisions

Please don't message about

Unpaid work or spec projects
Agency or outsourcing pitches
Recruiters for roles outside my stack

Checks messages twice a week

Skills

Erlang/OTPGoElixirlow-latency systemsrate limiting

Open to workLooking for a role

closes in 3 months

Next role: Software Engineer in banking, Rotterdam or hybrid

Target roles: Software Engineer
Level: Mid
Industries: Logistics, Consumer apps
Work mode: Hybrid
Available: 90 days notice
Work authorization: Authorized to work in Netherlands
What I'm looking for: Hands-on work on Elixir with room to mentor.
Not interested in: Agencies and outsourcing firms

6 years in real-time systems. Strongest at Elixir and Go. Available immediately.

Rotterdam, Netherlandserlang/otplow-latency systemsrate limiting

Open

Experience

Senior Software Engineer
Oct 2024 - Present
Société Générale · 2 yr · Full-time · Rotterdam, Netherlands
- Cut p99 latency on the real-time services from 827ms to 166ms.
- Led the migration of 40 services to Go.
Software Engineer
Jan 2023 - Oct 2024
Philips · 1 yr 9 mo · Full-time · Rotterdam, Netherlands
- Shipped a rewrite that took build times from 43 minutes to under 6.
- Cut p99 latency on the real-time services from 733ms to 51ms.
Software Engineer
Nov 2020 - Jan 2023
Deloitte · 2 yr 2 mo · Full-time · Rotterdam, Netherlands
- Wrote the Elixir service that now handles 36 million requests a day.
- Shipped 7 launches on the real-time team without a rollback.

References

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Education

École Polytechnique
Ingénieur, Electronics and Communication
2016 - 2020

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