Oleksandr Marchenko

If you’re a software engineer in your 20s, always remember that: The 10-minute Sev-1 fix will always look like brilliance, but that doesn’t mean the boring runbooks and failover drills were worthless; they are why your hands did not shake. The smooth launch will always get the applause, but that doesn’t mean two months of feature flags and canary rollouts were worthless; they turned risk into a switch. The elegant 20-line solution will always win code review, but that doesn’t mean your first brute-force plus tests were worthless; it mapped the problem so refactoring was obvious. The first-try design approval will always look like talent, but that doesn’t mean your ugly one-pager and early comments were worthless; they killed surprises when it was cheap. The 30% cost cut will always impress finance, but that doesn’t mean tagging resources and reading usage reports every Friday was worthless; the savings were hiding in that tedium. The zero-downtime migration will always feel like magic, but that doesn’t mean backfills, checksums, and a rollback plan were worthless; they made “magic” repeatable. The strong hire will always look lucky, but that doesn’t mean 40 structured interviews and a clear bar were worthless; they protected your culture. The junior shipping confidently will always look like their win, but that doesn’t mean pairing on their first bug and narrating your thinking was worthless; that is how you multiply yourself. Takeaway: it is easy to chase launches, titles, and shiny metrics. → After two decades, I can tell you the compounding sits in unsexy routines: small PRs, tests first, one RFC a quarter, p95 tracked weekly, logs read daily, a decision log, and one person unblocked every day. Consistency beats intensity. Do the quiet work, and the loud results will follow.

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Every Developer at a Growing E-Commerce Has Faced This Question. How do we scale order creation during a flash sale? You’ve got 4 options. Only one of them actually works. Let’s break them down. Option A: Synchronous order creation Blocks the request. DB write in the hot path. Crashes under load. Not built for scale. Option B: Asynchronous with message queue ✅ Accept the order. Drop it in a queue. Return fast. Process later. This decouples the API from the workload. It scales. It survives spikes. It gives you control. It wins because queues absorb pressure. Option C: Centralized order service One big box. One big bottleneck. Simpler code, same problems. Breaks at scale. Option D: Microservice everything Looks modern. Adds latency, coordination, and failure points. Still doesn’t buffer the spike. Wrong tool for this job. Trade-offs? (always) 1- Eventual consistency 2- You need idempotency (it is critical anyway) 3- You must monitor queue health 4- You need compensating transactions 5- Just remember, Queues don’t solve everything by themselves But those are engineering problems. A sync API crashing under load is a business problem. If you want to practice real system design problems like this every day, with streaks, leaderboards, and feedback, check out joinenginuity.com Because the best time to learn system design isn’t during a flash sale. It’s before one.

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You know that one senior dev on your team; let's call her Sarah. She makes everything look effortless: - Debugs issues in minutes while you're still stuck after hours - Writes clean code that just works - Explains complex concepts so clearly even non-tech people get it - Stays calm when production breaks You watch Sarah and think:  “I want to code like her.” So you try copying what you see; her debugging approach, coding style, PR structure. But it doesn't work the same for you. Here's why:  You're copying her methods, not her system. What you see: - Sarah writes clean code on first try - Quick, methodical debugging  - Clear technical communication What you DON'T see: - 2 years building her debugging framework - Her collection of refined code snippets - Daily 15-min learning ritual - Mistake log she updates after every bug - Weekly reflection sessions analyzing what worked/didn't Sarah's invisible debugging system: 1. Always reproduce the bug first 2. Check the same 5 places every time 3. Set 20-min timer, if stuck, ask for help 4. Update her "common issues" doc after each fix Her calm confidence?  It comes from having systems she trusts. When production breaks, she's not stressed, she has a proven process. You get stressed because you're improvising every time. Start building YOUR system: Week 1: Start a debug log Week 2: Create a 15-min daily learning ritual  Week 3: Build your first checklist/template Don't copy Sarah's methods. Build the system that will create YOUR methods. The senior dev others want to emulate?  That's who you become when you stop copying outputs and start building systems. What system are you building this week? 👇

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JetBrains just announced they're moving to a single, unified IntelliJ distribution starting with version 2025.3. No more choosing between Community and Ultimate - it's one IDE with features unlocked by subscription. Why does this matter? • Some previously paid features (Spring support, database tools) are becoming FREE • The open-source commitment remains, but with a twist • This signals bigger changes in how dev tools compete in the AI era I spent time analyzing the announcement and its implications. This isn't just about IntelliJ - it's about the future of IDEs in a world where AI assistants are changing how we write code. Full analysis here → https://lnkd.in/gBpSNWUu Curious: How many of you are using IntelliJ Community Edition today? What's your take on this change?

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Here's an uncomfortable truth: many developers struggle to produce effective documentation. I was one of them. My commit messages looked like "fixed bug" and my PR descriptions were basically empty. Then I discovered QuillBot's Chrome Extension and it completely changed how I communicate as a developer. It's not just another grammar tool. It's a structured, lightweight solution tailored for developers who need to write clear documentation, PRs, and emails while juggling complex codebases. Here's what QuillBot handles for me daily: ✔️ Paraphrasing technical explanations - Turn complex logic into clear comments ✔️ Grammar checking commit messages - Professional git history that impresses leads ✔️ Humanizing AI-generated documentation - Make ChatGPT docs sound naturally written ✔️ Polishing PR descriptions - Clear, concise explanations that get faster approvals ✔️ Improving client emails - Professional communication without grammar anxiety Whether you're writing technical blogs, documenting APIs, or just want to sound more professional in team communications, QuillBot helps you stay consistent without the writing overwhelm. The best part? It works right in your browser. No switching contexts, no breaking flow - just better writing wherever you type. As developers, we spend 40% of our time communicating. Why not make it effortless? Try QuillBot’s Chrome Extension for free - your future self (and your code reviewers) will thank you. What's your biggest technical writing challenge? #QuillBotForWork #QuillBotPartner #Ad

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'We only hire senior developers' Congrats! You're building a time bomb. Here's why: Senior-only teams create: • Echo chambers of outdated practices • Zero knowledge transfer • Expensive solutions to simple problems • 10 architects, no builders What you're really missing: • Fresh perspectives • Hunger to learn • Questions that challenge assumptions • Future leaders The brutal truth: • Your 'senior' requirements are fear-based • Your '10 years experience' is arbitrary • Your 'no junior devs' policy is expensive technical debt Why this matters: • Innovation needs new eyes • Growth requires teaching • Sustainability demands succession • AI is leveling the experience gap anyway How to fix it: 1. Hire for potential, not just experience 2. Create mentorship structures 3. Balance your team pyramid 4. Accept that juniors today code better than seniors did 5 years ago Remember: Today's 'risky' junior is tomorrow's 'savior'. What's your take on the senior-only trend? Drop your thoughts below 👇 *** P.S. If your entire team is senior developers, who's asking the 'stupid' questions that prevent stupid mistakes?

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From Developer to CEO Part 03: 5 to 10 years of experience Congratulations, you’re now a senior developer. But you’re not a senior just because you’ve reached 5 years of experience. You’re a senior because you’ve seen more problems— and you know how to prevent them. At this stage, you should be able to build software from A to Z. But your main focus must now shift to business impact. Not just how to code, but how to solve real business problems. Code shouldn’t be your challenge. Code should be your tool—to deliver value. For that, start asking the right questions: • What’s the real problem the customer is trying to solve? • Why does the client need this feature? • What’s the expected benefit for their business? • Is there a better solution? You’re not just a developer anymore. You should become a technical partner to your clients, not just someone who takes orders. Your new mindset: 👉 How can I maximize my customer’s success? If you follow these tips, you’ll level up faster. ⸻ After 20+ years in web development, I’m sharing what I wish I had known when I was younger. This post is a follow-up to Julien Rajerison’s post. Tomorrow, we’ll talk about developers with 10+ years of experience. ⸻ You’ve got this. I’m Toky RABESON. I’m a seasoned web developer.

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MediatR is powerful. But here's the truth: 👉 Using it for a simple project is like using a chainsaw to slice bread. Technically possible, but massively overkill. If your team and your app are small, chances are you don't need pipelines, handlers, and all the extra complexity. Stick to direct calls, filters, and middlewares — you'll ship faster with less cognitive load. 💡 The real flex? Choosing the simplest architecture that solves the actual problem.

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🚨 More than 70% of frontend devs struggles with this follow-up question in interview about PWAs? When asked: “How does offline access work in a PWA?” Most confidently say: “Because of Service Workers!” ✅ Correct… but do you know 👇 💡 “What’s the difference between Service Workers and Web Workers?” This is where many candidates struggle but not anymore Here’s the breakdown you should never forget: ⚡ Web Workers 1️⃣ Run JS in a separate thread → avoid blocking the UI. 2️⃣ Die when the page closes. 3️⃣ Best for CPU-heavy tasks (e.g. image processing, data crunching). 🌐 Service Workers 1️⃣ Act as a proxy between your app & the network. 2️⃣ Can intercept requests, cache responses, & serve content offline. 3️⃣ Live beyond page lifecycle → even when the app is closed. 4️⃣ Backbone of offline PWAs, push notifications, & background sync. 🚀 Key takeaway: Web Workers = Performance Service Workers = Offline + Background capabilities 📌 Have you ever faced this question in your system design interview? #Frontend #Interview #frontendinterview #PWA #SystemDesign #WebWorkers #ServiceWorkers #javascript #reactjs #frontendgeek

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