Liam Costello
Principal Tech Lead at Flowers-Software GmbH
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolLiam Costello is a Principal Tech Lead with 12 years of experience building resilient, cloud-native systems and scaling engineering teams across early-stage and growth-stage startups. He combines hands-on expertise in Kubernetes, Terraform, GCP/AWS and JVM/Rails stacks with a track record of steering teams through Series A/B funding and stabilizing systems during turbulent transitions. Liam has founded and led engineering orgs, grown teams to 30 engineers, and implemented hiring and career frameworks that improve long-term velocity and retention. As an active open-source contributor, he has added Lua scripting support and KAT tests to the widely used Emissary (Ambassador) API gateway, reflecting a pragmatic focus on operability and test automation. Based in Berlin, he’s curious by practice—his GitHub serves as a lab for experimenting with new languages and CNCF-centric tooling—and he coaches teams to prioritize core engineering principles over language orthodoxy.
12 years of coding experience
12 years of employment as a software developer
Bachelor of Science (BSc) HONS International Software Engineering, Bachelor of Science (BSc) HONS International Software Engineering at University of Staffordshire
English, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (13)
env10
lua10
kubernetes10
envoyproxy10
api-gateway10
python10
convoy10
kubernetes-pods10
testing10
pytest9
kubernetes-ingress9
docker8
dockers8
Programming languages (7)
Github contributions (5)
emissary-ingress/emissary
Feb 2019 - Mar 2019
open source Kubernetes-native API gateway for microservices built on the Envoy Proxy
Role in this project:
Backend Developer & Test Automation Engineer
Backend Developer & Test Automation EngineerContributions:8 commits, 3 PRs in 22 days
Contributions summary:Liam primarily contributed to the implementation and testing of Lua script injection functionality within the Emissary API gateway. This involved modifying core components to incorporate Lua scripting capabilities and creating corresponding KAT (Kat Ambassador Tests) tests. The user's work included changes to the `ambassador`, `envoy`, and test directories, ensuring the Lua scripts were correctly integrated and functional. The user also merged upstream changes into their feature branch.
api-gatewayproxyreverse-proxyambassadorapi-management
lolletsoc/ambassador
Feb 2019 - Jan 2022
open source Kubernetes-native API gateway for microservices built on the Envoy Proxy
Contributions:2 PRs, 13 pushes, 1 branch in 2 years 10 months
api-gatewayapienvoy-proxyenvoyproxy
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