Achim Kraus
Senior Embedded Software Developer at Enzo
Schorndorf, Baden-Württemberg, Germany
Summary
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Senior🎓
Top SchoolAchim Kraus is a Senior Embedded Software Developer with 25 years of software development and testing experience and deep expertise in distributed device systems, IoT, and secure CoAP/DTLS/LwM2M communication. He has been a key maintainer and project lead in prominent open-source projects such as Eclipse Californium and a committer to TinyDTLS, shaping Java CoAP/DTLS implementations and DTLS Connection ID/load-balancing features used in production IoT stacks. At Bosch and Bosch.IO he drove protocol-level improvements (PSK, ECDHE-PSK, DTLS CID) and contributed backend integrations for Eclipse Hono’s CoAP adapter, optimizing reliability and tracing for constrained devices. Comfortable across embedded C, Java and assembler, he blends low-level systems thinking with cloud-facing IoT protocols and standards participation (IETF, OMA). Based in Schorndorf, Germany, he combines long-term hands-on engineering with open-source stewardship, including nuanced work on DTLS handshake and retransmission behaviors that quietly improve real-world device interoperability.
11 years of coding experience
25 years of employment as a software developer
Diplom-Informatiker (master degree of computer science) Computer Science, Diplom-Informatiker (master degree of computer science) Computer Science at University of Stuttgart
Stackoverflow
764reputation
36kreached
72answers
1question
Github Skills (20)
messaging10
coap10
internet-of-things10
java10
eclipseiot10
javas10
cryptography10
dtls10
opentracing9
configuration-management9
pki9
vertx9
network-security9
iot6
rtos6
Programming languages (12)
Github contributions (5)
eclipse-californium/californium
Jan 2020 - Jan 2023
CoAP/DTLS Java Implementation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:29 releases, 82 reviews, 1260 commits in 3 years
Contributions summary:Achim Kraus contributed to the development and maintenance of the CoAP/DTLS Java implementation, Californium. His work focused on refining the handling of PSK (Pre-Shared Key) authentication, including improvements to processing and the handling of different key exchange mechanisms such as ECDHE-PSK. His contributions are evident in the cleanup of handshaker code, adjustments to option handling, and the addition of functionalities like verifying the server's certificate subject.
dtlsopcuaeclipseiotdevice-managementtls
eclipse-hono/hono
Mar 2020 - May 2022
Eclipse Hono™ Project
Role in this project:Back-end Developer
Back-end DeveloperContributions:46 reviews, 11 commits, 31 PRs in 2 years 2 months
Contributions summary:Achim primarily contributed to the coap-vertx-base adapter within the Eclipse Hono project. Their work involved extending open tracing capabilities for pre-shared key (PSK) identities, implementing configuration options such as DTLS thread counts, and optimizing the coap adapter with features like DTLS retransmission timeouts and message offloading. They also added a device-specific piggybacked response and implemented a simple receiver statistic for the CLI client. Furthermore, the user made modifications including implementing a blockwise status lifetime and checking URI length.
honoeclipseioteclipsemessagingjava
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