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© 2026 Oleksii Berliziev.
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Oleksii Berliziev
7projects
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7projects
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15 products taken from zero to live: SaaS, mobile, platforms. Shipped, scaled, still in production.

Showing 7 projects

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
Solo buildFull StackSaaSServices2021

Home Services Platform

Avocado Technology
Full-Stack Lead
Team 3

A two-sided homeowner-services marketplace whose mobile codebase had to be modernised solo, with payments re-integrated and CI/CD added, all while continuing to ship features without regressions.

Solo modernisation of a two-sided homeowner-services marketplace. Migrated the mobile codebase from JavaScript to TypeScript and class components to hooks. Consolidated a state-management mess of React Context + Apollo + Redux onto Apollo cache as the single source of truth. Re-integrated the Stripe payment flow against the modernised backend. Added CircleCI + Fastlane release automation. New features shipped throughout, with no feature-freeze and no user-visible regressions.

Outcomes

  • Legacy mobile codebase modernised solo on a live two-sided marketplace
  • No feature-freeze: new mobile and backend features shipped during the migration
  • Zero user-visible regressions during the modernisation
  • Modernised: JS to TS, class components to hooks, state-management consolidated onto Apollo cache
  • CI/CD introduced: CircleCI + Fastlane release automation
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

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