Oleg Filimonov

I created SLYK and have evolved it over 5 years, with 2 years of conventional development followed by 3 years of AI-assisted engineering. It is a platform for building and maintaining web, iOS, and Android products with shared TypeScript code.

The stack combines Next.js, React Native, Expo, tRPC, PostgreSQL, Drizzle ORM, and Better Auth in a Turborepo monorepo. I built shared authentication, validation, UI, localization, analytics, notifications, and AI chat integrations.

SLYK also includes reusable skills and instructions for Claude Code and Codex, automated checks, dependency maintenance, and release tooling for Vercel and Expo. App-store metadata and screenshot workflows live alongside the code.

I use this foundation across Max by Catch America, Healthcare Strong, Vaulted, Zero Cal, Zero Chat, and Zero Wish, and bring reusable improvements back into SLYK. My work covers architecture, web and mobile development, back-end services, AI integration, and delivery.

I built Zero Chat, a web and mobile product that brings multiple AI model providers into one interface. Users can switch models while keeping a shared conversation history, set custom instructions, and use chat tools.

My work includes streaming chat, model discovery, conversation persistence and search, personal memory, and usage accounting. The application uses the Vercel AI SDK and AI Gateway with Next.js, React Native, Expo, TypeScript, tRPC, and PostgreSQL. I also implemented authentication and subscription access.

Zero Chat builds on SLYK, my shared development platform, and uses AI-assisted engineering workflows with typed APIs and automated checks.

I developed web and mobile product features for Max by Catch America, an AI fishing assistant that combines conversational guidance with fishing reports, lake information, and fishing-related shopping.

My work includes AI chat, report review, lake data, administration, and Shopify integration. The Next.js and Expo applications share TypeScript services, tRPC APIs, authentication, and PostgreSQL data models.

The product uses SLYK as its development foundation. I work across the mobile and web interfaces, back-end services, third-party integrations, and delivery workflows, using AI-assisted development with automated validation.

I built Zero Cal, a nutrition tracking product with AI-assisted food logging. Users can record meals through text, voice, photos, barcodes, or nutrition labels, then review calorie and macro estimates and adjust portions.

My work includes food search, meal history, personal goals, logging streaks, weekly reports, reminders, and subscription access. The app supports English, Spanish, and Russian.

Zero Cal uses the SLYK architecture with React Native, Expo, TypeScript, Next.js, tRPC, and PostgreSQL. I develop the mobile interface, back-end services, AI integrations, and release tooling. Nutrition estimates remain editable so users can correct the results.

I built Zero Wish, a web and mobile wishlist product for saving and sharing gift ideas. Users can create wishes from product links or text, organize them into lists, and mark items as purchased.

I implemented AI-assisted product research that returns structured, editable drafts. Price extraction checks source evidence before accepting a researched price, and unknown fields remain editable. Other work includes authentication, public list sharing, subscriptions, and localization.

The application uses Next.js, React Native, Expo, TypeScript, tRPC, PostgreSQL, and the Vercel AI SDK. It shares the SLYK foundation and its AI-assisted development workflows.

I led a React Native team building Tapin Sports, a mobile platform for youth football leagues. The app brings players, coaches, parents, and fans together for player registration, scheduling, team rosters, statistics, and tournaments.

My responsibilities included mobile architecture, implementation, code review, and team development standards. I established code style, branching, and collaboration guidelines, and built delivery workflows with end-to-end UI testing, CI/CD, and automated store publishing.

The work combines React Native, TypeScript, Android, and iOS development, Firebase, and back-end integrations. I managed a team of up to five developers and supported the application through development and releases.

I developed Vyoo, a React Native social app for building communities around shared interests and nearby activities. The product combines community groups, individual and group chat, video chat, events, ticket sales, and local recommendations.

My work covered mobile application development for Android and iOS using React Native and TypeScript, with Firebase and back-end integrations. I worked on interfaces that help members discover communities, connect with people, coordinate meetups, and take part in events.

The project gave me experience building social and community products with communication, location-based discovery, and paid event workflows.

I developed the Android application for Ownage Pranks, an entertainment product built around a library of prerecorded calls performed by professional voice actors. Users browse characters and scenarios, choose a call, and review recordings in the app.

My work focused on the mobile application and its user experience, bringing the content library and call-related workflows into an Android interface. The app reached more than 100,000 users in its first month.

This project represents my earlier native Android experience before expanding into React Native, Expo, and full-stack web and mobile development.

I created Sleep Time, a mobile app for planning bedtime and wake-up times around estimated sleep cycles. Users choose when they want to wake up or go to bed and receive suggested times to help plan their routine.

I developed the Android and iOS application with React Native and worked on the user interface, user experience, and Firebase integration. The product turns a simple time calculation into an accessible mobile experience, with an emphasis on clear inputs and easy-to-read results.

Sleep Time is one of my independently developed consumer apps and forms part of my longer experience delivering and maintaining mobile products.

I developed web and mobile applications for Healthcare Strong, a wellness platform for healthcare workers. The product supports daily habits, team challenges, well-being check-ins, community posts, leaderboards, and rewards.

My work includes organization onboarding, member and administrator workflows, habit and challenge tracking, rewards, and notifications. The mobile app also supports optional Apple Health activity integration.

The Next.js and Expo applications use the SLYK architecture, with shared TypeScript packages, tRPC APIs, authentication, and PostgreSQL models. I work across product interfaces, back-end logic, integrations, testing, and delivery.

I developed a web and mobile marketplace for athlete collectible cards and fundraising. Vaulted connects athletes, clubs, competitions, and supporters through card collections and marketplace transactions.

My work includes player and club administration, card sets and editions, onboarding, auctions, offers, donations, and Stripe Connect payment integration. Shared APIs and PostgreSQL models support the Next.js and Expo applications.

The product builds on SLYK with TypeScript, React Native, tRPC, and reusable authentication and UI packages. I develop application architecture, web and mobile interfaces, back-end services, and delivery workflows.