Josef Fröhle
IT-Spezialist at DeineAgentur UG
Bramsche, Lower Saxony, Germany
Summary
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RockstarJosef Fröhle is an IT specialist and entrepreneur with 13 years of hands-on experience building secure, reliable server and hosting solutions from his base in Bramsche, Germany. As founder and CEO of a web agency since 2009 and now working at B1 Systems, he blends customer-facing product delivery with deep technical expertise in security, cryptography, Alpine Linux, Docker, Node.js and Go. He is an active open-source contributor, notably improving IPv6 handling in the Haraka SMTP server and adding SAN/EV support to the pem certificate library, reflecting a focus on protocol correctness and practical PKI tooling. Comfortable across hosting operations and low-level backend development, Josef brings a pragmatic mindset that turns security and networking subtleties into robust, production-ready systems.
13 years of coding experience
English, German
Github Skills (21)
javascript10
haraka10
csr10
smtps10
regex10
smtp10
network-programming10
smtpd10
certificate10
ipv610
nodejs10
mta10
ssl9
tls129
tls139
Programming languages (28)
Github contributions (5)
Dexus/pem
Feb 2014 - Jan 2022
Create private keys and certificates with node.js
Role in this project:
Back-end Developer
Back-end DeveloperContributions:25 releases, 6 reviews, 112 commits in 8 years
Contributions summary:Josef primarily focused on enhancing the `pem` library for certificate and CSR (Certificate Signing Request) generation and analysis. Their contributions involved adding support for Subject Alternative Names (SANs) in certificates, enabling the inclusion of DNS and IP address entries. The user also refined the SAN integration, updated the CSR process, and improved the retrieval of certificate information to include SAN and EV (Extended Validation) details, and changed the default settings.
nodejsprivate-keycertificatejavascriptcsr
haraka/Haraka
Sep 2015 - Oct 2016
A fast, highly extensible, and event driven SMTP server
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 releases, 50 commits, 84 PRs in 1 year 1 month
Contributions summary:Josef primarily contributed to the Haraka SMTP server's code base by addressing IPv6 compatibility issues, improving code robustness, and fixing bugs. They modified code across several plugins, including those related to authentication, connection handling, and DNS lookups to ensure the server could correctly handle IPv6 addresses. Their contributions demonstrate a focus on core server functionality and network protocol compliance, improving the reliability and standards compliance of the SMTP server.
event-drivensmtp-serversmtpmtajavascript
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