Krzysztof Jeliński

💡 Just getting started with programming? Or maybe you’ve been coding for a while and want to solidify your basics? Wojciech Korona - Software Engineer at Playbook Engineering - shares 15 essential tips for beginner programmers. From debugging and clean code to learning fundamentals and leveraging community, these are the practices that truly matter in real-world coding. 👉 Swipe through the slides below and share your own tips in the comments! #TipsForBeginners #SoftwareEngineering #EngineeringCulture #TechCareers #PlaybookEngineering #LifeAtPlaybook

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I spoke at Golang Warsaw last week on accelerating Go development with Claude Code. With AI practices evolving so rapidly, it's hard to distinguish effective techniques from noise. My goal was to be clear about what works for me and encourage others to challenge my views and share their experience. The talk sparked a great discussion on how AI can genuinely make us better engineers. As always, you can find the slides and the complete Claude configuration here: https://lnkd.in/dykAJafq My talk was split into four parts: ▪ Model: Understanding the different Claude models and their specific strengths. You don't need to be an expert to choose the right one for the job. ▪ Context: Providing high-quality context is crucial. This includes maintaining an up-to-date CLAUDE md, using mcp (context7!) for access to the latest docs, a clear PLAN md (with corresponding _memories_ files), and practicing good context hygiene. This area offers the most significant gains in output quality. ▪ Prompt: A structured approach like the CLEAR framework and tools like the Claude prompt optimizer significantly improve prompt quality. Check videos from the last Claude Dev conference on this topic. ▪ Tools: CLI integration and automated hooks create seamless workflows. Claude benefits from Go's rapid feedback loop - strongly-typed language, limited keywords, plus golangci-lint. Let me know if you've got feedback or want to share what's working in your code base! Building effective AI workflows for your team? Let's figure it out together. The competitive edge is real. Thank you for the warm welcome! Shutout to the organizers - Golang Warsaw Meetup and our host - Venture Café Warsaw Foundation! #golang #meetup #ai #claude #claudecode #go

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We’re happy to support and share an exciting new community in Poland 🇵🇱 In just two weeks, the very first Nx Wrocław Meetup will take place - marking the start of a new local community focused on monorepos, developer productivity, and scalable engineering with Nx. The meetup organizer is Adrian Romański, whom some of you may remember as a speaker at ngGlühwein. Together with the team at PushBased, he’s launching Nx Wrocław to bring developers, architects, engineering managers, and tech leads together to share real-world experience and best practices around Nx at scale. What participants can expect: 🧩 An introduction to Nx and why monorepos matter 🛠️ Deep dives into Nx tooling, plugins, and workflows 📦 Practical examples from production teams 🗣️ Talks by PushBased engineers actively working with Nx 💬 Open discussion, Q&A, and networking Whether you work with JavaScript/TypeScript, Java, .NET, or another ecosystem - if you care about scaling teams and improving developer workflows, this meetup is highly relevant. It’s more than just one evening - it’s the beginning of the Nx Wrocław community. 👉 Sign up here: https://buff.ly/ESaHLtQ 👉 Join the LinkedIn group: https://buff.ly/bllUCYS 🌊 Nx Wrocław #1 – Launch Meetup 📅 28 January 2026 📍 Wrocław

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IDPs solved the developer experience problem. Now we're solving the last piece of the puzzle. Backstage rallied the OSS community. Port.io productized the concept with polish and velocity. Both changed how engineering teams think about internal platforms. But Kubernetes? Still a blind spot. Most IDPs offer metadata, manifests, and links to external tools. Yet when something breaks, devs still need to understand how to fix it. That’s where Komodor comes in. By integrating directly into Backstage and Port, we bring live Kubernetes context into the developer portal and the developer experience. Health. Changes. Alerts. Root causes. Everything your teams need to take action—without leaving the IDP they know and love to use. The result:  - Developers actually understand what’s running—and how to fix it  - Platform teams stop firefighting and gain operational clarity and enforcement  - Kubernetes becomes a built-in part of the developer experience —not an afterthought The IDP revolution isn’t done yet. But NOW? It's getting Kubernetes native.

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🌀 What’s really happening in .NET today? We’re not talking hype. This is hands-on insight from someone who just migrated a production project to .NET 8. We spoke with Yahor Halubchyk, a senior .NET engineer at Vention, to get a grounded take on current trends, migrations, and what’s worth paying attention to. ⚙️ .NET 8 has become the default. It’s stable, fast, and LTS-backed. Upgrading from earlier versions is usually a matter of days. As for .NET 9 — most teams are skipping it and waiting for 10, which promises smart memory handling and auto-optimizations for collections and performance. 🧱 Still on .NET Framework? Brace yourself. If your project’s on modern .NET (formerly Core), migration is straightforward. But if you're stuck on .NET Framework 4.8, you're likely looking at a full rewrite. The architecture is different, and most libraries just won’t work out of the box. 🧩 Third-party libraries are the real bottleneck. Yahor put it simply: “If you're on the standard Microsoft stack, migration is smooth. But if you’re using MongoDB, niche ORMs, or older open-source packages, expect to dig through source code and open GitHub issues.” 📉 Blazor and Razor? Still niche. They’re rarely used in production. React and Angular dominate the frontend. Blazor might work in edge cases, like when sensitive business logic has to stay server-side, but it’s not the go-to. 🤖 AI + .NET: not just buzz — it’s useful. GitHub Copilot struggles with complex logic. But GPT-4? Surprisingly solid. Yahor’s team uses it to generate SQL queries, unit tests, and advanced search logic, especially when given proper context. 🧠 .NET itself? It’s more than a language — it’s an engineering mindset. Think architecture, optimization, concurrency. The learning curve is steep, but so are the opportunities. As Yahor puts it: “If you have real experience, you can jump straight into a project and deliver. For juniors, we offer solid growth.” 📌 We're hiring: 🔹 Senior .NET Developer — https://lnkd.in/digGyN3s 🔹 Intern .NET — https://lnkd.in/dqAM8NPQ

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Managing multiple frontends for different geographies, brands, or vendors? You don’t have to build separate applications for each one. Filip Rakowski has a tested solution to this challenge. In this talk, co-founder & CTO of Alokai, shared with us how to: ✔️ Handle multi-geo and multivendor setups ✔️ Abstract APIs for flexibility ✔️ Reuse code across sub-applications ✔️ Build scalable frontend architectures using Nuxt & Vue Enjoy real-life examples and unique storytelling 👉 https://lnkd.in/eUE8d9UZ Bonus: there’s a live coding demo at the end to bring it all together. #VueJS #NuxtJS #FrontendArchitecture #eCommerce #OpenSource #WebDevelopment #VueMeetup

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Time for the next speaker at WarsawJS Meetup #133 - meet Szymon Chmal! 🛠️ Write Once, Test Everywhere: Cross-Platform Testing for React Native 💡 Testing React Native apps has always been a trade-off between speed and realism. Jest is fast and excellent for unit tests, but it runs in Node.js and relies on mocks for native modules. End-to-end frameworks offer realism, but at the cost of complex setup, slow pipelines, and high maintenance. Szymon Chmal will introduce React Native Harness, a new testing framework that lets you run Jest-style tests directly on real devices and simulators, with full access to native modules and no mocks by default. This is a game changer for cross-platform testing! Szymon Chmal is a React Native expert at Callstack and creator of the Rozenite and React Native Harness frameworks. He is also a Microsoft MVP in Web Development. He focuses on cross-platform development and building tools to make life easier for developers. He is the founder of GDG Toruń. ⚡ WarsawJS Meetup #133, December 9, 2025, 6:30 PM DataArt Warsaw, WeWork, Mennica Legacy Tower, West Building ul. Prosta 20, 00-850 Warszawa, 1st Floor, Room 01C Tickets: https://lnkd.in/dyf3ji8e Sponsors: Xfaang, DataArt Media Partner: K MAG Partners: Webellian, JetBrains

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Fellow devs, I'm running a workshop this Saturday in Warsaw on fundamentals of ai-assisted development. We will cover: - specs-driven development: quickly turning any idea into manageable project plan - intro Task Master: probably the best tool for ai-native project management (using it via command line and MCP) - surviving vibe-drifts and avoiding vibe-bankruptcy (thinking like product managers, understanding tasks complexity, dependencies) - ai-native TDD: making coding agents write good tests, not asserts that always pass :) No slides this time, all coding: the kata format is great as all participants learn by doing and build the muscles, not an illusion of knowledge. Who is in?

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Ready to go contract? The market is on your side… Contract roles in Poland are growing fast, allowing IT professionals to choose the projects that best suit them and earn more in the process. And what's more, contracting in Poland isn’t complicated. With the right support, setup can take days, not weeks. If your want more control over your work, income, and career, contracting might be right for you. We can help you get started. Our new guide shows you how to make the switch simply and confidently with end-to-end support from our engagement hub.

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How #Frontend Roles Drive Product Success in Poland’s Tech Market? ➡️ Front-end vacancies have evolved into must-have positions. Employers now expect front-end developers to deliver both functional code and great design. ➡️ “Front-end engineers are currently among the most sought-after professionals in Poland because they are the ones who shape how users feel a product. In the era of digital transformation, every company – regardless of industry – needs an intuitive, well-crafted interface,” says Emilia Szczepańska, HR Projects Coordinator at Verita HR Group. “It’s the front end that defines the first impression and, ultimately, the product’s success in the market. Companies fully understand this.” #ITinPoland #React #Angular #PolishITMarket https://lnkd.in/dWm7ZKi2

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🚀 Boost Your Spring Boot Apps with GraalVM! Have you heard about GraalVM? I am start using this and It boost my productivity when I am not using this I have to wait 3-5 sec to build my project. GraalVM is so fast it can build the whole project in just near about 0.2 sec. It's not just another JVM — it's a powerful high-performance runtime that can compile your Java code ahead-of-time (AOT) into native executables. And for Spring Boot developers, this can be a game changer! 💥 💡 Why should Spring Boot developers care about GraalVM? ✅ Ultra-fast startup times ✅ Low memory footprint ✅ Ideal for serverless & microservices ✅ Native image generation with tools like Spring AOT & Native Build Tools Imagine your Spring Boot app going from seconds to milliseconds in startup time. That’s the power of GraalVM native images. 🛠️ Whether you're building cloud-native apps, serverless functions, or want to squeeze more performance out of your JVM apps — GraalVM is worth exploring. 📚 Want to dive deeper? Check out: graalvm.org And for Spring Native: Spring Boot Native Docs

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At adaptTo() 2025, our Tooling track highlights how automation can streamline AEM operations. In this session, you'll see how the ACM Tool enables permissions and content updates as code—making repeatable tasks faster, safer, and more reliable.    Krystian Panek & Tomasz Sobczyk (VML) introduce ACM (AEM Content Manager), a powerful open-source tool designed to automate content migrations and permission management across all AEM environments. Built with modern technologies like React Spectrum and Sling jobs, ACM offers a stable, developer-friendly experience that replaces tools like Groovy Console and AECU with a unified, scriptable interface for managing large-scale tasks efficiently.    Join us at adaptTo() 👉

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Andrzej Grzesik and Jarosław Pałka are live at JNation 2025 with: “Gentle Introduction to Lock-Free Programming in Java”. A session for those ready to look under the JVM’s hood — and rethink how concurrency and performance can be achieved without locks. Java Champion and community leader Andrzej joins forces with benchmarking specialist Jarosław to explore runtimes, memory models and how to write faster, safer code in Java. #JNation #Java #Coimbra #Concurrency #JVM #SoftwarePerformance #LockFreeProgramming

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