Case notes, catalog entries and posts from MDSW. Helping companies build sustainable software and teams.https://mdsw.trenhttps://mdsw.tr/case-notes/loyalty-points-on-ethereum-in-one-monthhttps://mdsw.tr/case-notes/loyalty-points-on-ethereum-in-one-monthHow disposable, self-deleting test servers let an engineer new to blockchain put a loyalty app's points on a live Ethereum smart contract in about a month.Sat, 26 Sep 2026 00:00:00 GMTBlockchainEthereumSoliditySmart ContractsInfrastructure AutomationChefhttps://mdsw.tr/case-notes/rescuing-stalled-loyalty-platformhttps://mdsw.tr/case-notes/rescuing-stalled-loyalty-platformHow a stalled loyalty app got a new team, a JSON:API schema, tests for every change and automated delivery, and hit 20,000 active users in under a year.Sat, 26 Sep 2026 00:00:00 GMTAPI DesignJSON:APICI/CDEngineering LeadershipTeam BuildingRuby on Railshttps://mdsw.tr/catalog/mdsw-17https://mdsw.tr/catalog/mdsw-17A complete business plan for a consumer app, from megatrends and a 389-person survey to the business model, competitors and funding.Sat, 26 Sep 2026 00:00:00 GMTTechnology EntrepreneurshipBusiness PlanningLean CanvasUser ResearchCompetitor AnalysisFinancial Modellinghttps://mdsw.tr/catalog/mdsw-23https://mdsw.tr/catalog/mdsw-23A social network I built alone from 2004, in plain PHP and MySQL, with AJAX pages that updated without reloading.Sat, 26 Sep 2026 00:00:00 GMTSocial NetworkPHPMySQLAJAXLinuxCommunity Platformhttps://mdsw.tr/catalog/mdsw-24https://mdsw.tr/catalog/mdsw-24A Facebook app from 2010 that paired you with one stranger a day, for 24 hours, and showed each of you the other's Facebook profile only when both agreed.Sat, 26 Sep 2026 00:00:00 GMTFacebook PlatformSocial AppPHPMySQLAJAXMutual Disclosurehttps://mdsw.tr/catalog/mdsw-34https://mdsw.tr/catalog/mdsw-34A study of how a young B2B company with a small marketing budget can enter new markets through the partners it already works with.Sat, 26 Sep 2026 00:00:00 GMTB2B MarketingBrand AmbassadorsBrand CommunityStakeholder TheoryMarket EntryStorytellinghttps://mdsw.tr/catalog/mdsw-63https://mdsw.tr/catalog/mdsw-63A prototype for Kimlic, a blockchain identity startup: scan a QR code with your phone and sign in to a website with an identity already verified through KYC.Sat, 26 Sep 2026 00:00:00 GMTBlockchainEthereumSolidityRuby on RailsKYCIdentity VerificationPasswordless Authenticationhttps://mdsw.tr/catalog/mdsw-1https://mdsw.tr/catalog/mdsw-1How a 1.5B-parameter code model was taught to write a Ruby version it had never seen for about €4.20.Fri, 25 Sep 2026 00:00:00 GMTSmall Language ModelsLoRA Fine-TuningSynthetic DataRubyIC/EC DiagnosticFinOpshttps://mdsw.tr/catalog/mdsw-50https://mdsw.tr/catalog/mdsw-50A subscription-commerce platform that grew through cost discipline, reinvestment and tenant trust, and stayed alive because I put my own money in.Fri, 25 Sep 2026 00:00:00 GMTSubscription CommerceRailsStimulusTerraformhttps://mdsw.tr/case-notes/aligning-distributed-team-gcp-terraformhttps://mdsw.tr/case-notes/aligning-distributed-team-gcp-terraformHow a fractional tech lead aligned a France and Istanbul team, added CI/CD, modernized a Rails app, and moved a client's manual GCP setup to Terraform.Thu, 24 Sep 2026 00:00:00 GMTInfrastructure as CodeTerraformGCPEngineering LeadershipDistributed TeamsCI/CDhttps://mdsw.tr/case-notes/from-excel-to-self-sustaining-startup-intelligence-platformhttps://mdsw.tr/case-notes/from-excel-to-self-sustaining-startup-intelligence-platformHow a founder's Excel database became a live startup intelligence platform with a structured data model, self-service admin and a subscription business.Thu, 24 Sep 2026 00:00:00 GMTRuby on RailsData ModelingProduct DevelopmentStartup IntelligenceEngineering Ownershiphttps://mdsw.tr/case-notes/platform-that-runs-without-its-engineerhttps://mdsw.tr/case-notes/platform-that-runs-without-its-engineerHow a test-first quality floor, one stack and rewritten critical paths let one engineer grow a platform's revenue several times over in under a year and leave it running unattended.Thu, 24 Sep 2026 00:00:00 GMTTest StrategyTechnical OwnershipFrontend SimplificationInfrastructure as CodeRuby on Railshttps://mdsw.tr/blog/blockchain-transactionhttps://mdsw.tr/blog/blockchain-transactionBlockchain'de bir transferin bankacılıktaki EFT'den farkı, işlemi madencilerin nasıl onayladığı ve Ethereum'da işlem ücretinin gas ile nasıl hesaplandığı.Wed, 26 Jul 2017 00:00:00 GMTBlockchainEthereumBitcoinTransactionhttps://mdsw.tr/blog/blockchain-cuzdanihttps://mdsw.tr/blog/blockchain-cuzdaniBitcoin ve Ethereum gibi dijital paraların nerede durduğu: cüzdan adresi, şifre ve gizli anahtar, cüzdanın kimliğinizi neden taşımadığı ve nasıl korunduğu.Sat, 15 Jul 2017 00:00:00 GMTBlockchainEthereumBitcoinWallethttps://mdsw.tr/blog/blockchain-nasil-calisirhttps://mdsw.tr/blog/blockchain-nasil-calisirBlockchain'in çalışma mantığı: veri blokları, hash değerleri, madencilik ve zincire yazılan bir kaydın neden değiştirilemediği. 2017'de yazılmış bir giriş.Thu, 13 Jul 2017 00:00:00 GMTBlockchainBitcoinEthereum