Jens Halm - Gone at Far Away

Jens Halm

Gone at Far Away

London, England, United Kingdom

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Summary

👤

Senior

Jens Halm is a seasoned software architect and independent consultant with over two decades of experience designing and building large-scale, modular server and client applications. Since 1998 he has led Greenfield projects and rewrites, specialising in structuring complex systems, API design and refactoring to reduce accidental complexity. For the past decade his technical focus has been the Scala ecosystem and Typelevel stack—he is the long-time lead maintainer of Laika, a functional documentation toolkit used by projects like cats and http4s. Jens contributes to notable open-source Scala projects (http4s, finch) with practical improvements in documentation, build infrastructure and robust request handling. He pairs deep OO and FP expertise with hands-on DevOps and JVM skills, and is selective about Scala-only contracts from his London base. An uncommon strength is translating legacy Java/Flux-era architectures into purely functional, production-ready systems while mentoring teams on FP and concurrency.

13 years of coding experience

18 years of employment as a software developer

German, English

Stackoverflow

Stats

489reputation

12kreached

11answers

0questions

Github Skills (21)

http10

sbt10

finagle10

validation-rules10

finch10

scala10

top-level9

website-development9

rest9

typer9

documentation9

cat8

fs8

json8

mixins6

Programming languages (2)

ScalaHTML

Github contributions (5)

http4s/http4s

Oct 2021 - Feb 2022

A minimal, idiomatic Scala interface for HTTP

Role in this project:

Back-end Developer & DevOps Engineer

Contributions:29 commits, 6 PRs, 20 comments in 4 months

Contributions summary:Jens primarily contributed to the documentation and website aspects of the http4s project. They added and updated favicon configurations, ensuring proper display. Additionally, the user removed workarounds related to Laika documentation issues, indicating involvement in build process and documentation management. They also made updates related to sbt-typelevel and Laika, showing proficiency in build configuration and project infrastructure.

scalahttp-serverhttp-clientfs2typelevel

finagle/finch

Jan 2015 - Feb 2015

Scala combinator library for building Finagle HTTP services

Role in this project:

Back-end Developer

Contributions:9 commits, 13 PRs, 122 comments in 18 days

Contributions summary:Jens contributed to the `finagle/finch` repository, a Scala combinator library for building Finagle HTTP services, by implementing new features and fixing bugs related to request handling and validation. The commits focused on adding applicative behavior to the `RequestReader`, improving error handling, and enabling reusable validation rules. The user also updated the `DecodeRequest` API to return `Try` instead of `Option`, and deprecated several APIs.

combinatorfinaglehttp-servicescalafinch

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