Nikena Software — Bring your idea to life.

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  Overview Screens

  AI · EdTech · iOS

  Study AIAI exam-prep app for iOS

  Study AI turns a student's own course material into a personal study plan. Students answer a few questions about how they study, upload notes, PDFs, slides or photos, and the app generates study guides, flashcards and practice tests with AI, plus a hands-free audio mode for studying on the go.

  What we deliveredThe native iOS app – onboarding and study-plan flow, material upload, AI-generated study tools, subscriptions and the App Store release, followed by updates.

  App Store
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  Overview Screens

  Audio · Faith · iOS + Android

  Srbski Pravoslavni MolitvenikSerbian Orthodox audio prayer book

  A Serbian Orthodox prayer book in Cyrillic with every prayer recorded by real voices, no AI narration. Built for daily use: a calm, dark reading UI, an audio player for listening in silence or on the move, and very few ads.

  • 10K+Google Play downloads
  • 5.0★App Store rating

  What we deliveredThe iOS and Android apps, audio playback, ad integration and both store releases.

  App Store Google Play
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  Overview Screens

  VinoMobile · iOS + Android

  Wine TrainerWSET & sommelier exam prep

  Flashcard trainer with 4,700+ questions for WSET and sommelier exams. Learners pick topics – regions, grape varieties, wine profiles, sensory and aromas – train in rounds, track their success rate per round to close knowledge gaps and get daily micro-lessons through local push notifications. One-time purchase, no subscription.

  • 10K+Google Play downloads

  What we deliveredNative iOS and Android development, notifications, statistics, purchases and store releases.

  App Store Google Play
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  Overview Screens

  AI · Faith · iOS + Android

  The Bible VerseAI graphic-novel Bible

  The first graphic-novel Bible with AI-powered insights. Key moments of Scripture are illustrated, chapters come with audio, and readers can ask an AI Bible guide any question, summarize a highlighted passage in one tap, take notes and search verses by keyword.

  What we deliveredThe full app for iOS and Android – illustrated reader with audio player, AI chat and summaries, search, highlights and notes – plus both store releases.

  App Store Google Play
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  Overview Screens

  VinoMobile · iOS + Android

  Wine TastingAroma decoder & tasting method

  Part of VinoMobile, a suite of five expert wine apps. Wine Tasting decodes 270 aromas and wine terms – origin, meaning and quality – teaches a step-by-step “drill-down” tasting method and lets friends host virtual tastings and compare their notes.

  • 10K+Google Play downloads

  What we deliveredNative iOS and Android development, new features, OS and SDK updates and regular App Store and Google Play releases for a long-term client.

  App Store Google Play
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  Overview Screens

  Logistics · Android

  ACCUR8 DriverTrucking loads & settlements

  Driver app for the ACCUR8 trucking platform. Drivers sign in to see their current and past loads – pickup and delivery stops, miles, weight and stop count – view and upload load documents, and track their earnings with yearly and all-time summaries and downloadable PDF payroll statements.

  • 1K+Google Play downloads

  What we deliveredNative Android development – loads and stops, document upload, settlements and PDF statements, API integration and Google Play releases.

  Google Play
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  Overview Screens

  VinoMobile · iOS + Android

  Wine VintagesVintage chart & drinking windows

  7,500 quick vintage ratings for 175 wine regions, with optional in-depth packs: 3,400+ detailed weather and quality analyses, ideal drinking-window guidance and an A–Z index of 1,000+ regions, plus an Apple Watch companion for a quick check at the shelf.

  • 5K+Google Play downloads

  What we deliveredNative iOS and Android development, in-app purchases, OS and SDK updates and store releases.

  App Store Google Play
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  Overview Screens

  VinoMobile · iOS + Android

  Wine ProfilesSommelier study & wine guide

  A precise reference for sommeliers and WSET students: 2,700 profiles for 1,300 wine regions and grape varieties, with climate, soils, grape distribution and typical tasting notes. Smart tags for exams, fairs or trips, drag-and-drop sorting and full offline access.

  • 5K+Google Play downloads

  What we deliveredNative iOS and Android development, OS and SDK updates and App Store and Google Play releases.

  App Store Google Play
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  Overview Screens

  VinoMobile · iOS + Android

  Wine TemperaturesServing temperature calculator

  Enter the wine's current temperature, bottle size, surroundings and the target serving temperature, and the app calculates how long the bottle needs to cool or warm. It also shows recommended serving temperatures for sparkling, white, rosé, red and sweet wines.

  • 10K+Google Play downloads

  What we deliveredNative iOS and Android development, OS and SDK updates and store releases as part of the VinoMobile suite.

  App Store Google Play
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  Overview Screens

  Food delivery · Android

  TapDriverFood delivery driver app

  Driver app for the TapFood delivery network. Drivers go live with one toggle, see restaurants and pickups on a live map, work through a queue of current orders with distance and timing, and sign in quickly with fingerprint authentication.

  What we deliveredThe Android app – live order map, order list, account and availability, biometric sign-in and the Google Play release.

  Google Play
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  Overview Screens

  AI studio · Website

  Big Idea ProWebsite for an AI video ad studio

  Website for Big Idea Pro, an AI studio that produces video ads, photos, UGC and motion graphics with AI models who speak Serbian, English and 20+ other languages. Video-first: an animated hero, a showreel, swipeable ad galleries, AI model profiles, a step-by-step process, services and an inquiry form, in Serbian and English and fully responsive.

  What we deliveredDesign and development of the website, animations, video sections and the inquiry flow.

  Website

App names, icons and screenshots belong to their respective owners and are shown as examples of our work.

What clients hire us for

Build it. Update it. Make it earn.

1. 01

   App updates

   New OS versions · Play target-API · library replacements

   Android and iOS version updates, Google Play target-API requirements, SDK migrations and replacing outdated libraries, so apps stay in the stores and keep working. Clients come back to us for each new round.

2. 02

   Ad monetization

   AdMob · LevelPlay · Yandex — across 100+ apps

   Ad SDKs, mediation and placements that earn without wrecking the experience. Implemented across 100+ client apps, and running in apps of our own.

3. 03

   Integrations

   Firebase push & deep links · chat SDKs · WhatsApp & Viber APIs

   Firebase push notifications and deep links, chat SDKs on Android and iOS, WhatsApp and Viber APIs, and REST back ends.

4. 04

   Porting

   iOS → Android with a matching UI

   Existing iOS apps converted to native Android with the same look and flows, so both stores get the same product.

5. 05

   MVPs to the stores

   Figma → code → release → first updates

   From an idea or a Figma file to a release on the App Store and Google Play, plus the first updates after launch.

6. 06

   AI features & TV apps

   OpenAI · Claude · Gemini · Android TV · Fire TV

   AI features built on the OpenAI, Claude and Gemini APIs, and streaming apps for Android phones, Android TV and Fire TV.

Two platforms. One studio.

Kotlin and Jetpack Compose on Android, Swift and SwiftUI on iOS — one team for both stores.

How we work

• Full source code & IP

  You get the full source code and IP for everything we build.

• Tested before it ships

  AI tools help us move faster; every change is reviewed and tested before release.

• Clear, fast communication

  In English, with Slack or Jira if your team already uses them.

What clients say

Clients come back for the next round.

• “Excellent developer, would absolutely hire again. Amazing work and communication. One of the best people I have ever worked with in any capacity.”

• “He brought deep expertise in Android Jetpack Compose and iOS Swift UI development, and his contributions were invaluable. He not only helped us integrate several complex SDKs seamlessly but also provided insightful suggestions that improved both the functionality and user experience of our app.”

• “Nikola was very diligent and transparent. He is a clear communicator, sets the right expectations, and delivers as promised. I would hire him again in a heartbeat.”

• “Second round working with Nikola - completely professional and helpful. All good all around!”

Excerpts from client reviews on completed Upwork contracts.