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🚀 Senior Principal Software Engineer | Open Source Advocate | Java & Kubernetes…
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Ioannis Canellos shared thisI am becoming increasingly concerned with were the industry is heading. Seeing legends promoted to "free agents" is something I can't get my head around. All the best Arun.Ioannis Canellos shared thisWhen I joined JetBrains 164 days ago, I never thought I would be promoted to a "Free Agent" this soon. My job was terminated last Friday as part of a corporate tradition as old as time: the Reorg Rumble™, once again! 🎭 💥 🌀 I'm #OpenToWork and actively seeking full-time opportunities. I am skilled at growing developer communities from 0 → millions, GTM, developer experience, driving open source strategy and engagement, mentoring small/large teams or a senior IC, and KPI-driven processes. 🚀 🌍 📈 If you are looking for a speaker, open-source strategist, or panelist, you can hire me via this link: https://lnkd.in/gP8fiq7C. 💬 🎙️ 🗣️ If you’re building something exciting or want to catch up, my DMs are open, and my spirit is strong. 💪 ☀️ 🔥
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Ioannis Canellos posted thisAfter spending the last couple of weekends vibe coding I realize that there are traits in languages and frameworks that I would expect people to be more vocal about. For instance, hot reload is no longer just about developer experience. Compilation and start-up times kill vibe coding, making hot reload a must. Generally speaking the faster the feedback loop the better. In that regard using a statically typed language also helps. To be fair statically typed language tend to be more verbose, so there is definetely a trade off here. Another thing I notice is that the larger the project, the easier for the tool is to forget earlier instructions. Automated tests make a hell of a difference, as they act as a constrant reminder and protects against going in circles. So, I am growing a renewed interest in TDD. I am curious to hear what other traits people identify and what other methodologies they find useful. I am also curious to see if we'll get frameworks that are #vibecodingfirst.
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Ioannis Canellos shared thisGood luck to your journey towards your next role, Jonathan!Ioannis Canellos shared thisHi everyone! Sonar has eliminated the Developer Advocacy team. I’m seeking a new role and would appreciate your support. If you hear of any opportunities or just want to catch up, please send me a message or comment below. I’d love to reconnect. #OpenToWork About me & what I’m looking for: 💼 I’m looking for Developer Advocate/Solution Engineer roles. ⭐ I’ve previously worked at Sonar and Red Hat.
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Ioannis Canellos shared thisI just realised that I haven't shared this little gift that came through the mail the other day. It's a gift from AuthZed for my contributions to #SpiceDB and specifically for the Quarkusio integration with #SpiceDB. The actual gift was merchantise store credits, I used to get this cool hat. The code can be found at: https://lnkd.in/dc6n9XWT Fun fact: The integration was implemented during the time where I had my left hand broken, so it was mostly implemented using just the right hand. If you've ever used a split keyboard you can easily identify the challenges, so one has to get creative: https://lnkd.in/dxx4gxV2 Thanks again to AuthZed for this nice gesture!
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Ioannis Canellos shared thisIt's Saturday afternoon. I am experimenting with a java based tool that I need to integrate on my CI pipeline ... Problem 1: It needs to run with java 21 while my runner has only 17 installed. Problem 2: It's not trivial to use another image. Problem 3: It's not trivial to install a different JDK version. Epiphany: I can use https://jbang.dev to get the portable jdk version of choice, download the java based tool from github and run it in one go. Problem Solved!
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Ioannis Canellos shared this🛡️ NixOS like #Kali Linux While #Kali Linux is widely used in #cybersecurity, I personally use NixOS because it offers qualities I deeply value as a software engineer: • Immutability • Idempotency • Declarative system configuration To combine those principles with hands on security work, I built https://lnkd.in/divsuB8u. It is a module for NixOS and/or #HomeManager that: • Installs cybersecurity tools, dictionaries, and scripts declaratively • Works on NixOS or #HomeManager on top of your favorite Unix system • Provides a #Kali like experience without distro hopping, VMs, or fragile setups • Keeps your environment reproducible and clean The project is still a work in progress and evolves as I dive deeper into practical cybersecurity content on CYBER RANGES: https://lnkd.in/diJfWcM9 Source code and feedback welcome!
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Ioannis Canellos reposted thisAs someone who already saw it I can just recommend everyone to watch it. It is one of those movies where you are already eager to know when the next one is out. Mark you calendars and enjoy!Ioannis Canellos reposted thisThe countdown begins. DAWN OF CYBERWARFARE, proudly sponsored by CYBER RANGES, is arriving soon — a documentary that shines a spotlight on the realities of the modern digital battlefield. As part of our mission to promote and strengthen best practices in national cyber defence and cyber resilience, we’re supporting this project to raise global awareness on the threats reshaping today’s world. Get ready — premiering December 12 on YouTube. 👉 Subscribe to the YouTube channel @DCWdocumentary to catch the trailer and all upcoming updates: https://lnkd.in/dC3Rumx5 Produced by the Bold Stroke Sponsored by CYBER RANGES. #CYBERRANGES #Cybersecurity #CyberTraining #CyberDefense #BeAheadOfTheCyberGame #DCWdocumentary #Documentary #DawnOfCyberwarfare
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Ioannis Canellos reposted thisIoannis Canellos reposted thisWhat an inspiring week in Cyprus! 🚀 Workation with a big focus on how to utilise Cyber Security platforms and whats next in this field. A fantastic collaboration between Blekinge Tekniska Högskola, Promestra and CYBER RANGES. Many thanks to everyone who participated and shared their knowledge! Dr. Anders Carlsson, Dr. Oleksii Baranovskyi, Dr Alexander Adamov 🇺🇦🇸🇪, Dragos Ilie, Ioannis Canellos and of course to our host George! #Peanutbagde
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Ioannis Canellos reposted thisIoannis Canellos reposted thisWe’re looking for a Delivery Manager to help us scale our impact as we grow internationally. The role reports to Aris, our awesome COO, and sits at the heart of how we deliver value to our customers. If you love health tech and smooth implementations, check out the role!
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisTook a day off today to get the last requirement for my Professional Diploma in Quantum Engineering completed. Thanks to Professor Elena Blokhina and the team at UCD for putting together a really interesting course. Also to Anton Dekusar of IBM Research for the guest lectures and insight into the cutting edge. https://lnkd.in/dXDRVBF8 The timing is apt since right now at Red Hat we're focused on mitigating future security threats by adding Post Quantum Cryptography support across our product portfolio. It was really cool to learn the other side of this ... both the theory behind Shor's algorithm that puts RSA at risk, and the current reality of quantum computing with the Qiskit Python libraries and IBM Quantum Platform.
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisExcited to share that our work “Deep Illumination–Guided Light Probe Placement” has been accepted to Eurographics Posters 2026! Authored by Andreas Tarasidis, Andreas Vasilakis, and Ioannis Fudos, the poster will be presented at the Eurographics Conference, taking place May 4–8, 2026. 📌 Join us at the Poster Q&A session Date: Wednesday, May 6 Time: 15:30–16:00 🔗 Program details: https://lnkd.in/dU9t8GDd 🔗 Paper & more information: https://lnkd.in/dYztSATF
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisHonored to be promoted to Distinguished Fellow of the EuroMed Academy! Grateful for the support of colleagues and collaborators all the way! EuroMed Academy
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Ioannis Canellos reacted on thisFull house at Devoxx Greece! See you again during lunch time at « Meet with the Quarkusio team » at the MC2 room!Ioannis Canellos reacted on thisWow! That was a lot of people at our workshop session about "Building your own Java-powered Agentic Apps" 😀 . Thanks to all at Devoxx Greece for joining, I hope you enjoyed it as much as we did! Dimitris Andreadis Georgios Andrianakis Mario Fusco The Java Community - Devoxx Quarkusio IBM
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisToday marks 8 years at Red Hat! To celebrate, the company gave me a new title: Distinguished Engineer. Since it’s April 1st, I waited until it was official in the system before posting. I'm happy to report it’s not a prank! Between the new title and just publishing my book, "Generative AI on Kubernetes" with Roland Huß, I think I’m officially out of big news for a while... It has been a great ride so far, and it’s going to be even better now!
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisI’m super excited to share that I’ve joined Google! After an amazing 4.5 years at Meta, I'm incredibly grateful for my time there and proud of the opportunity to directly impact on-device ML, personalization, and the GenAI/Llama ecosystems. A massive thank you to all my past colleagues, teammates and mentors! This week, I'm starting my next chapter at Google. I’ll be focusing on applied research across core ML topics, specifically working on LLM modeling efficiency, evaluation and finetuning. I can't wait to tackle these new challenges!
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisI was recently promoted to Senior Principal Software Engineer at Red Hat. After the most intense 14 months of my career, building the Kubernetes MCP Server, going all-in on AI-assisted development, and keeping Fabric8 and Eclipse JKube healthy, this milestone means a lot. I wrote about the journey, the people who made it possible, and why this one hit differently: https://lnkd.in/eAGKkSxjPromoted to Senior Principal Software Engineer at Red HatPromoted to Senior Principal Software Engineer at Red Hat
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Ioannis Canellos reacted on thisIoannis Canellos reacted on thisJust started my 22th year at Capgemini
Experience
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Education
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Panepistimion Ioanninon
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🎓 Thesis
Medical language processing using Ontologies and NLP
🔹Statistical language modeling
🔹UMLS
🔹OpenNLP
🔹Java
💻 System Support Group
Volunteer program for students to help with the administration of the school infrastructure
🔹Securtiy
🔹Printers
🔹Backup
Licenses & Certifications
Projects
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Quarkus Langchain4j
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The Quarkus LangChain4j extension seamlessly integrates LLMs into Quarkus applications, enabling the harnessing of LLM capabilities for the development of more intelligent applications.
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Quarkus Backstage
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An extension that simplifies the integration of Quarkus applications with Backstage.
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Dekorate
See projectDekorate is a collection of Java compile-time generators and decorators for Kubernetes/OpenShift manifests.
It makes generating Kubernetes manifests as easy as adding a dependency to the classpath and customizing as simple as setting an annotation or application property. -
Spring Cloud Kubernetes
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See projectSpring Cloud Kubernetes provides implementations of well known Spring Cloud interfaces allowing developers to build and run Spring Cloud applications on Kubernetes.
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Fabric8 Kubernetes Client
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An extensible Java framework for interacting with Kubernetes and OpenShift
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Apache Camel
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Apache Camel is an Open Source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.
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Apache Karaf
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Apache Karaf is a modulith runtime, supporting several frameworks and programming model. It provides turnkey features that you can directly leverage without effort, packaged as mutable or immutable application
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Apache ServiceMix
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Apache ServiceMix is a flexible, open-source integration container that unifies
the features and functionality of Apache ActiveMQ, Camel, CXF, and Karaf
into a powerful runtime platform you can use to build your own integrations solutions.
It provides a complete, enterprise ready ESB exclusively powered by OSGi. -
Apache Curator
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Apache Curator is a Java/JVM client library for Apache ZooKeeper, a distributed coordination service.
Apache Curator includes a high-level API framework and utilities to make using Apache ZooKeeper much easier and more reliable. It also includes recipes for common use cases and extensions such as service discovery and a Java 8 asynchronous DSL. -
Apache jclouds
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Apache jclouds is an open source multi-cloud toolkit for the Java platform that gives you the freedom to create applications that are portable across clouds while giving you full control to use cloud-specific features.
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Hackers Guide to Jiu Jitsu (Hobby Project)
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Hg2jj is a media organizer application for Jiu Jitsu instructionals.
It was named after a blog series I wrote a while back (Hackers guide to Jiu Jitsu) on note taking and skill acquisition using Jiu Jistsu as the target domain.
The application is used in order to split long instructional videos into sections, fetch metadata for online sources, generate note taking templates, m3u playlist, transcripts etc, enabling the creation of flashcards or content for RAG. -
Presentations
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My presentations repository
Languages
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Greek
Native or bilingual proficiency
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English
Professional working proficiency
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German
Limited working proficiency
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ITuziast
#Article | "Modern reliability engineering with Microsoft Azure" | by Dimitar Grozdanov In this article, we explore how Azure’s platform capabilities can transform traditional #SRE practices. This is done with combining automation, observability and resiliency, directly into cloud operations. From autoscaling and disaster recovery to error budgets and governance alignment, #MicrosoftAzure provides a unified model for managing mission-critical workloads. Link to article: https://lnkd.in/duTgNsp8 #AzureSRE #AzureCAF #ITOperations
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Midori - Platinum Atlassian Marketplace Partner
🧑💻 An "Approved” pull request doesn’t always mean compliant changes. If Bitbucket Cloud pull request rules matter for your team, read it here: https://lnkd.in/d3uamBvj Pull requests in Bitbucket Cloud are where decisions get made. But approvals alone don’t guarantee compliance without a systematic and automatic change control in place. How do you ensure in @Bitbucket Cloud that: 🔖 Commit messages follow standards? 🔗 #Jira work items are properly linked? 📝 Pull request titles and descriptions are meaningful? 🏷️ Branch names are traeceable to work items and reflect your workflows? We broke down for engineering managers and compliance leads what Bitbucket Cloud can enforce out of the box, where it falls short, and how to build automated guardrails for your team’s pull requests. 🛂 No more manual policing 🧐 No more missed links for audits ✅ Just clean, compliant, traceable merges If Bitbucket Cloud pull request rules matter for your team, read it here: https://lnkd.in/d3uamBvj 💭 Curious: What’s the ONE rule you wish every pull request in your org followed by default?
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Dblytics
Mistral has launched its Agents API, enabling code execution, web search, and image generation within LLM workflows. Here's a quick breakdown: Web Search: Delivers grounded citations from reliable sources. Code Execution: Executes Python code in a secure environment. Image Generation: Creates images using FLUX1.1. Document Library: Supports retrieval-augmented generation using uploaded files. MCP Tools Integration: Attach APIs, internal systems, or structured data stores to run external tasks from agent workflows. Agent Orchestration: Define task handoffs to control agent delegation for complex tasks. Access and Availability: Publicly available via Mistral’s developer portal with API key. This advancement has the potential to significantly streamline operations and enhance decision-making across various industries. Follow or connect for more such ai news and breakthroughs. Ignoring AI's potential means risking falling behind. dBlytics helps SMEs convert AI innovation into practical workflows. #AI #LLM #MistralAI #AgentsAPI #MachineLearning #Innovation
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Coralogix
#Prometheus users and developers from around the world gathered in Berlin last week to share knowledge, best practices, and experiences gained from using Prometheus at #PromCon EU. Senior DevOps Engineer Nicolas Takashi and Software Engineer Israel Blancas were featured speakers on day two of the event. You can view their respective sessions via the links below! Reverse-Engineering PromQL Usage: A Proxy’s Tale: https://lnkd.in/eYJcGWuY Debugging the Pipeline: Observability for Your Observability with OTel + Prometheus: https://lnkd.in/e5BvDzr7
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Deep Engineering
𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐝 𝐂𝐨𝐧𝐜𝐮𝐫𝐫𝐞𝐧𝐜𝐲 𝐢𝐧 𝐆𝐨: 𝐌𝐢𝐡𝐚𝐥𝐢𝐬 𝐓𝐬𝐨𝐮𝐤𝐚𝐥𝐨𝐬 𝐨𝐧 𝐃𝐞𝐚𝐝𝐥𝐢𝐧𝐞𝐬, 𝐂𝐨𝐧𝐭𝐞𝐱𝐭𝐬, 𝐚𝐧𝐝 𝐁𝐨𝐮𝐧𝐝𝐞𝐝 𝐖𝐨𝐫𝐤 For Deep Engineering #𝟏𝟒, we spoke with Mihalis Tsoukalos, a UNIX systems engineer and prolific author of 𝐺𝑜 𝑆𝑦𝑠𝑡𝑒𝑚𝑠 𝑃𝑟𝑜𝑔𝑟𝑎𝑚𝑚𝑖𝑛𝑔 and 𝑀𝑎𝑠𝑡𝑒𝑟𝑖𝑛𝑔 𝐺𝑜 (4th ed.). He holds a BSc (University of Patras) and an MSc (UCL), has written for Linux Journal, USENIX ;login:, and C/C++ Users Journal, and brings deep systems, time-series, and database expertise. 𝐓𝐡𝐢𝐬 𝐢𝐬𝐬𝐮𝐞 𝐜𝐨𝐯𝐞𝐫𝐬: ✓ Request-scoped concurrency with context.Context, cancellations, and deadlines ✓ Coordinated error handling with errgroup and failure propagation ✓ Bounded concurrency via worker pools, semaphores, and backpressure ✓ Observability and graceful shutdown through context errors and cancellation signals ✓ A 7-point production checklist for disciplined goroutine lifecycle management We’ve also published the 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐂𝐡𝐚𝐩𝐭𝐞𝐫 𝟖 𝐨𝐧 𝐆𝐨 𝐂𝐨𝐧𝐜𝐮𝐫𝐫𝐞𝐧𝐜𝐲 from 𝑀𝑎𝑠𝑡𝑒𝑟𝑖𝑛𝑔 𝐺𝑜, alongside our 𝐢𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 and transcript. 𝐑𝐞𝐚𝐝 𝐭𝐡𝐞 𝐟𝐮𝐥𝐥 𝐢𝐬𝐬𝐮𝐞 𝐡𝐞𝐫𝐞 → https://lnkd.in/gbkeQ2RN
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Yugabyte
Implementing CDC using Spring Boot, Debezium’s embedded engine, and YugabyteDB offers a compelling strategy for real-time data synchronization without the complexities of a dedicated middleware.💡 This new blog from Yugabyte expert Srinivasa Vasu details why this embedded approach is ideal for scenarios that require simplicity, low latency, and reduced operational complexity.⬇️ https://hubs.la/Q03mr-V60
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Data Stack Conf
🔐 PostgreSQL Security you can’t ignore. Valeria Bogatyreva from Percona shows how Open Source TDE closes real security and compliance gaps in PostgreSQL. If you store sensitive or regulated data — this is a must-watch. 🎥 Watch here: https://lnkd.in/dcgqNwRu #PostgreSQL #Security #TDE #Compliance #OpenSource #DataStackConf
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