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© 2026 Oleksii Berliziev.
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Oleksii Berliziev
10projects
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10projects
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15 products taken from zero to live: SaaS, mobile, platforms. Shipped, scaled, still in production.

Showing 10 projects

TeamFull StackSaaSSports2022–2026

Golf Tournament Platform

All Square
Tech Lead
Team 7–11

A platform the founders' team runs themselves. They author pages, manage mobile-app sections and scan tickets on-site during live events. No developer in the loop after launch.

Greenfield tournament platform, live since 2022. - Web app with an admin dashboard and a built-in no-code page builder; - iOS and Android apps with separate user and on-site admin modes for ticket scanning; - NestJS backend with background workers. Held the whole platform alone in the final year, including a full content migration from the old site.

Outcomes

  • Three tournament editions, four years in production
  • Thousands of concurrent users on tournament days
  • On-site ticket scanning during live rounds
  • Operations team ships product changes without a developer in the loop
  • Full content migration from the old site (pages, media, historical results)
See how it shipped
LinksLive AppApp StoreGoogle Play
TeamMobileSaaSSports2022–2026

Golf Club Booking App

All Square
Mobile Lead
Team 8

A native iOS and Android booking app for the club, owned end-to-end as mobile lead from architecture to real-world solution.

React Native booking app for a Swiss golf club, built end-to-end as the mobile lead. Owned the architecture and feature delivery. Built the Saferpay integration on a dedicated REST backend. Shipped to both the App Store and Google Play.

Outcomes

  • Mobile lead from first commit to launch
  • Saferpay payments shipping on iOS + Android
  • Booking with promocode system, step restore and lock system
See how it shipped
LinksApp StoreGoogle Play
TeamMobileSaaSFintech2020–2022

Currency Exchange App

Avocado Technology
Mobile Lead
Team 9

A Swiss fintech mobile client where everything had to ship production-grade: a complex multi-step regulated signup (Onfido KYC), four-language localization and signed iOS/Android release pipelines.

Mobile lead on a Swiss fintech currency-exchange app, live in four languages (DE, FR, IT, EN) on both stores. Owned the architecture end-to-end. The signup was a complex multi-step regulated flow with Onfido KYC. Added mobile observability and attribution (Crashlytics, Firebase Analytics, AppsFlyer) and an externalised translations workflow. Ran the iOS/Android release pipelines on CircleCI + Fastlane, later migrated to GitHub Actions.

Outcomes

  • Application launched in a regulated Swiss market
  • Complex multi-step Onfido KYC signup with nested sub-flows
  • Mobile observability and attribution: Crashlytics, Firebase Analytics, AppsFlyer
  • Localization in DE/FR/IT/EN, edited by non-devs from a third-party translation platform
  • iOS + Android release pipelines built on CircleCI + Fastlane, then migrated to GitHub Actions
See how it shipped
LinksApp StoreGoogle Play
Solo buildFull StackSaaSServices2018–2020

On-Demand Car Wash

Avocado Technology
Full-Stack Lead
Team 3

An on-demand service platform built solo from zero. Customer mobile app, dispatcher web dashboard, backend and infra. Shipped, productised and re-launched in a second market.

Solo from-scratch build of an on-demand car-wash platform: customer mobile app, dispatcher web dashboard, backend and AWS infrastructure, all owned by one developer. Live in the original market 2018–2020, then productised and re-launched in South Africa.

Outcomes

  • Solo build of mobile + dispatcher web + backend + infra
  • Live in the original market 2018–2020
  • Productised and re-launched in South Africa
How I shipped it
LinksPrivate / NDAMore details available on request
TeamFull StackSaaSServices2019–2020

Last-Message Delivery App

Avocado Technology
Full-Stack Lead
Team 5

A messaging app that delivers pre-written content (text, video, documents) to chosen recipients when the user stops checking in, reachable even by recipients who never installed the app. Reliability over arbitrary time windows was the whole product.

From-scratch build of a dead-man's-switch messaging app: sends pre-written personal messages (text, video, documents) to chosen recipients when the user stops checking in. Recipients without the app open the delivery on a web view via a one-time token in the notification, SMS, or email. Led the team through the full lifecycle and owned the architecture end-to-end.

Outcomes

  • Recipient web view for people who never installed the app
  • Led the team through the full build lifecycle
  • Multi-channel delivery: push to app users, plus one-time-token SMS/email links to a recipient web view for everyone else
  • Architecture owned end-to-end across mobile, web, backend, and AWS
See how it shipped
LinksApp StoreGoogle Play
TeamFull StackSaaSServices2017–2018

Scheduling App

Avocado Technology
Developer
Team 8

A Calendly-style scheduling app where multi-participant calendar reconciliation across Google, iCloud and Outlook had to work correctly on iOS and Android.

Calendly-style mobile scheduling app on React Native, live on both stores. Reconciles availability across Google, iCloud and Outlook calendars for multiple participants. Handles push reminders and cross-region time zones. Contributed on the backend against Parse SDK and GraphQL, with Sentry for crash and error tracking. Raised test coverage from 0 to over 80%.

Outcomes

  • Multi-participant calendar reconciliation across Google, iCloud, and Outlook
  • Cross-region time-zone correctness with push reminders
  • Test coverage raised from 0 to over 80% on a shared codebase
See how it shipped
LinksApp StoreGoogle Play
TeamMobileSaaSGov2018

E-Learning Platform

Avocado Technology
Developer
Team 7

A government e-learning and assessment app, delivered offline-capable on iOS and Android within a 3-month contractual deadline.

Mobile e-learning and student-assessment app for a government client, built on React Native with REST APIs, Fastlane-automated releases and Sentry for crash reporting. Content delivery and student assessments both worked offline. iOS and Android shipped simultaneously inside a 3-month contractual window.

Outcomes

  • iOS and Android shipped simultaneously to a 3-month contractual deadline
  • Offline content delivery and offline student assessments
  • Fastlane-automated release pipeline for both platforms
How I shipped it
LinksPrivate / NDAMore details available on request
Personal projectFull StackSaaSIoT2016–present

Home Security Platform

Personal
Developer
Team 1

A self-hosted home-security system rebuilt four times across a decade, from camera-to-cloud, through a full mobile + sensor stack, to a leaner Telegram-bot worker running on a Raspberry Pi today.

Solo, self-hosted home-security platform in its tenth year, rebuilt four times. v1 streamed camera footage to Google Drive. v2 added a full backend. v3 grew into a full mobile app with RFID access and a CO₂ sensor. v4 deliberately cut everything back to a Raspberry Pi running a Telegram-bot worker: camera capture + cloud upload, alerts and control via chat, no web UI, no mobile app, no cloud bills. Running today across three locations.

Outcomes

  • Four architecture iterations over a decade (2016 to today)
  • Deliberate v3 → v4 simplification: full mobile + sensor stack to a Telegram-bot worker on a Raspberry Pi
  • Hardware integration: GPIO, RFID, CO₂ sensor on Raspberry Pi
  • Running today across three locations with zero cloud bills
How I shipped it
LinksPrivate / NDAMore details available on request
TeamFull StackSaaSSports2022

Sporting Event Platform

Avocado Technology
Full-Stack Lead
Team 5

A sporting-event proof-of-concept on a one-month deadline: web, mobile and backend, all built from scratch and demo-ready before the event opened.

One-month from-scratch build of a sporting-event proof-of-concept platform: a React web app, a React Native mobile app and an Apollo + Mongoose backend, all from scratch. Covered event agenda, signup/sign-in, news and webviews of pages from the existing event site. Led the team and delivered demo-ready before the event opened.

Outcomes

  • Three platforms (web + mobile + backend) shipped from scratch in one month
  • Led the team through a one-month from-scratch build to a fixed event deadline
  • Demo-ready before the event opened
How I shipped it
LinksPrivate / NDAMore details available on request
Personal projectWebPortfolio SiteServices2026

Personal Portfolio Site

Personal
Designer & Developer
Team 1

A portfolio that doubles as proof of work: it has to look designed, load fast, rank well and demonstrate production-grade frontend architecture rather than just describe it.

This site itself: a from-scratch personal portfolio on the Next.js App Router with a Server-Component-first architecture. Ships a tokenized Tailwind v4 design system with full light and dark theming, an SEO layer (per-route metadata, Open Graph images, JSON-LD, sitemap) and a spam-protected contact form. Designed, built and deployed solo.

Outcomes

  • Server-Component-first App Router architecture with client boundaries pushed deep and narrow
  • Tokenized Tailwind v4 design system with full light and dark theming from a single source of truth
  • Complete SEO layer: per-route generateMetadata, dynamic Open Graph images, JSON-LD structured data, and sitemap
  • Accessible, spam-protected contact form (Zod + React Hook Form + Resend + Cloudflare Turnstile)
  • Built to localize: all copy externalized via next-intl (single en locale today)
See how it shipped
LinksLive AppSource

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