Boris Z.

I finish, extend and launch software products that already exist in some form: a live platform that needs its next feature, a prototype that will not ship, an MVP a previous developer left behind, a Figma file with a spec. A fixed price scoped before you commit, one team for design, build and launch, everything in your name. ⭐ 100% Job Success, 1,000+ hours on Upwork, Top 1% If someone has told you that you need to start over, get a second opinion first. Most products I see need finishing, not rebuilding 𝗥𝗘𝗖𝗘𝗡𝗧 𝗪𝗢𝗥𝗞 🚀 Built a telehealth chat and video calling app MVP in 4 weeks and scaled the calling architecture for a UK client that helped them scale past 100,000 paying customers 🔁 Replaced a German market-research panel's dated white-label app (2M members, 74 countries) with a native Flutter app in 10 weeks, shipped as an update so the store ratings carried over, plus their own push platform: 172,000 survey invitations in three weeks 🧾 Built an IRS-grade ACA reporting platform for a New York accounting founder: e-file export done in a week, IRS test scenarios accepted with zero errors, filings for five states, pages under 100 ms for employers up to 5,000 staff 🍸 Took a Baton Rouge nightlife startup from a name and a logo to both app stores in four and a half months, with Stripe Connect payouts to venues and bartenders: 150 sign-ups on launch day, 1,000 users by January 🩹 Stabilized a Belgian edtech's children's reading app built by freelancers and AI tools, live two weeks before they called: one-week discovery, crashes fixed, Android memory use cut about 90%, shipped in their next store submission 𝗪𝗛𝗔𝗧 𝗖𝗟𝗜𝗘𝗡𝗧𝗦 𝗖𝗢𝗠𝗘 𝗧𝗢 𝗠𝗘 𝗪𝗜𝗧𝗛 🔧 A working product that needs a mobile app, an AI feature, a payment or billing system, or a migration, without disturbing what already works 🧩 A half-built app, a Lovable or Bolt prototype, or a codebase from a developer who disappeared, that needs to reach production and the app stores 📐 A spec or a design and no team to build it, and the wish for someone who tells you what to do next rather than asks 💻 An engineering team that needs a senior engineer in its sprints for the long term 𝗛𝗢𝗪 𝗜𝗧 𝗪𝗢𝗥𝗞𝗦 1. 📞 A call. We go through what you have and where it is stuck, and you leave with a clear next step. 2. 🔍 A Launch Readiness Audit. In five business days you get a written review of your product or your spec: the risks, an architecture and store-submission plan, and a delivery roadmap with a fixed price for the build. Fixed fee, credited against the build if you go ahead within 30 days. You keep the roadmap either way. 3. 🏗️ The build. One fixed price for the agreed scope, a staging link within the first two weeks and a demo every week. A written definition of done before we start, so nothing is assumed. You get what you pay for 4. 🚀 Launch. If I build an app for you, App Store and Google Play review handled until both are approved, hosting and accounts set up in your name, a handover document your next developer could work from 5. 📈 Launch and Grow. A monthly block of engineering and design time for what comes next, with a shared roadmap and a monthly review. Most clients grow with me, this is how 𝗪𝗛𝗔𝗧 𝗬𝗢𝗨 𝗖𝗔𝗡 𝗖𝗢𝗨𝗡𝗧 𝗢𝗡 🧱 I work with what you have. Rebuilding is the last option, not the first. 💰 The price moves only when you change the scope, in writing. 🔑 Code in your repository from day one. Accounts, keys and store listings in your name. 📲 Store review handled until you are live. ⏱️ A reply within the same business day, and a weekly written update on what shipped, what is blocked and what is next. 𝗦𝗧𝗔𝗖𝗞 React, Next.js, Node.js, TypeScript, Python with Django and FastAPI, .NET and C#, React Native, Flutter, Swift and Kotlin, PostgreSQL, Supabase, Firebase, Stripe and RevenueCat, AWS and Azure, OpenAI and Claude APIs, RAG and AI agents. 𝗙𝗢𝗥 𝗘𝗡𝗚𝗜𝗡𝗘𝗘𝗥𝗜𝗡𝗚 𝗧𝗘𝗔𝗠𝗦 If you need a senior engineer in your standups and code review on React, Node, Python or .NET, 20 to 40 hours a week, European hours with US East overlap: the first two weeks are a paid trial, and either side can stop at the end of it. 𝗔𝗕𝗢𝗨𝗧 𝗠𝗘 I am Boris, a full-stack developer based in Europe with 10+ years building and shipping web and mobile products. You work with me directly from the first call to launch and beyond. Clients describe the work as clear, on time and on budget, and the thing they mention most is that I tell them what I think before they ask. 💬 Message me with what you have and where it is stuck, or book a 30-minute consultation from this profile. You will hear back the same business day Full-stack development, web application development, mobile app development, SaaS development, MVP development, AI integration, chatbot development, API development and integration, Stripe integration, app maintenance, code review and audit, UI/UX design, App Store and Google Play submission