Ivan Lučin — VP of Engineering at Productive. Notes on frontend, AI agents and side projects; talks and podcasts, in English and Croatian.https://randomness.hr/enhttps://randomness.hr/playground/fleet/https://randomness.hr/playground/fleet/Supervise and steer every Claude Code session, on every machine, from one place — a Rust CLI, a phone-first web app and a macOS app over Tailscale.Wed, 23 Sep 2026 00:00:00 GMTenplaygroundrusttypescriptreacttauritmuxclaude-codehttps://randomness.hr/talks/building-an-agent-harness-shift-2026/https://randomness.hr/talks/building-an-agent-harness-shift-2026/How Productive rebuilt its AI agent harness three times for a vertical SaaS with 50,000 users — the architecture and patterns that survived.Mon, 14 Sep 2026 00:00:00 GMTentalkshttps://randomness.hr/writing/when-writing-code-is-no-longer-the-issue/https://randomness.hr/writing/when-writing-code-is-no-longer-the-issue/We now need to build habits, systems, and culture around AI coding — on slop, review as the new bottleneck, the validation loop and the AI vampire effect.Fri, 14 Aug 2026 00:00:00 GMTenwritingaiengineering-leadershipcode-reviewhttps://randomness.hr/podcasts/productive-ai-podcast/https://randomness.hr/podcasts/productive-ai-podcast/A conversation about building Productive's AI platform and agents — what we're building, how, and what we're hiring for.Tue, 09 Jun 2026 00:00:00 GMTenpodcastshttps://randomness.hr/writing/testing-the-test/https://randomness.hr/writing/testing-the-test/Code in automated tests should also be tested — how to keep tests honest by minimising logic, sharing structure, breaking the code on purpose and measuring how good your tests really are.Fri, 30 Jan 2026 00:00:00 GMTenwritingtestingfrontendengineeringhttps://randomness.hr/writing/ai-engineers-challenges-part-1-intro/https://randomness.hr/writing/ai-engineers-challenges-part-1-intro/Prompts are code and the model is the runtime. Why AI-enhanced software is easy to get 50% working, hard to push to 80%, and impossible to finish.Tue, 23 Dec 2025 00:00:00 GMTenwritingai-engineeringllmevalshttps://randomness.hr/podcasts/end-of-year-podcast-2025/https://randomness.hr/podcasts/end-of-year-podcast-2025/Productive's CEO and VP of Engineering look back on 2025 and share what we're excited about in the year ahead.Tue, 23 Dec 2025 00:00:00 GMTenpodcastshttps://randomness.hr/writing/sta-sve-radi-engineering-manager-u-productiveu/https://randomness.hr/writing/sta-sve-radi-engineering-manager-u-productiveu/Dugačka verzija odgovora na pitanje što EM radi u Productiveu — popis od 30-ak stvarnih odgovornosti, od weekly planninga do performance reviewa.Mon, 12 May 2025 00:00:00 GMThrwritingengineering-managementproductiveleadershiphttps://randomness.hr/podcasts/developeri-na-aparatima/https://randomness.hr/podcasts/developeri-na-aparatima/Zapošljavanje developera je teže, nezadovoljstvo developera je deklarativno visoko, nema više jeftinog novca, a IT hype je u silaznom trendu – i to je dobra stvar?Mon, 14 Oct 2024 00:00:00 GMThrpodcastshttps://randomness.hr/talks/kultura-kvalitetnog-engineeringa-debug-2023/https://randomness.hr/talks/kultura-kvalitetnog-engineeringa-debug-2023/Kako u produktnoj firmi izgraditi engineering kulturu u kojoj je kvaliteta navika, a ne ceremonija — procesi, review, ownership i mentorstvo.Thu, 15 Jun 2023 00:00:00 GMThrtalkshttps://randomness.hr/talks/how-we-dared-to-compete-with-google/https://randomness.hr/talks/how-we-dared-to-compete-with-google/Why a small Zagreb team decided to build a product in a space dominated by Google — and what we learned competing with a giant.Sat, 24 Sep 2022 00:00:00 GMTentalkshttps://randomness.hr/writing/8-problema-kod-pregledavanja-pull-requestova/https://randomness.hr/writing/8-problema-kod-pregledavanja-pull-requestova/Hrvatska verzija mog odgovora na Arkencyjev članak o nedostacima pull requestova — osam problema koje developeri imaju s reviewom i kako ih rješavamo u Productiveu.Tue, 24 May 2022 00:00:00 GMThrwritingcode-reviewprocessengineering-culturehttps://randomness.hr/writing/pull-requests-and-why-theyre-not-all-that-bad/https://randomness.hr/writing/pull-requests-and-why-theyre-not-all-that-bad/A point-by-point reply to Arkency's 'Disadvantages of pull requests' — most PR pain comes from how teams run reviews, not from the practice itself.Thu, 03 Mar 2022 00:00:00 GMTenwritingcode-reviewprocessengineering-culturehttps://randomness.hr/writing/react-ruined-web-development/https://randomness.hr/writing/react-ruined-web-development/React solved real rendering problems — and catalysed JavaScript fatigue, ecosystem churn and an obsession with framework choice over engineering fundamentals.Thu, 17 Jun 2021 00:00:00 GMTenwritingreactfrontendopinionhttps://randomness.hr/playground/random-2020/https://randomness.hr/playground/random-2020/The original randomness.hr — a tiny 2020 experiment with a random-colour grid and a snake game, kept alive at /random/.Sun, 21 Jun 2020 00:00:00 GMTenplaygroundjavascriptcsshttps://randomness.hr/playground/snake/https://randomness.hr/playground/snake/A classic snake game in plain JavaScript — my 2016 weekend experiment, still playable on GitHub Pages.Wed, 02 Nov 2016 00:00:00 GMTenplaygroundjavascriptcanvas