Oliver Spryn Consultancy

Founder & CEO

UPMC Enterprises

- Landed #4 top medical app in Google Play
- Led Android app architecture growth from 0 to 350K+ active users
- Delivered a telemedicine app at the height of COVID-19 on time and on budget

Lead Android Architect

Inspirata

- Designated as the engineering spokesman to executive leadership
- Created a testing strategy that led to a 3x decrease in product delivery time

Research Software Engineer

Bentley Systems

Software Engineering Intern

Smith Micro Software, Inc.

Quality Assurance Engineering Intern

Teaching 150k+ how to build chart-topping Android apps

I know what it takes to build world-class software.
It starts with a mindset that creates like it's already 2026.

This second-nature thinking has earned me the trust of top companies such as Google, Tesla, Shopify, and Fastly.

Here is my track record:

- Trusted by 1M+ users, with 90M monthly impressions
- Built a $25M production-ready Android app development roadmap

What you can get from me:

- 7+ years of vetted, hardened experience
- An acceleration toolkit to ship your app up to 6-12 months sooner
- Long-range insights that keep your investment in apps fresh and current

Are you building a new Android app or struggling to maintain an old one?

I'll help you build stable, modern apps that both users and engineers love ahead of time and under budget.

Oliver Spryn

BillEase

Android Team Lead

Seven Peaks Software

- assisting Android devs in their challenging tasks. Advising on the best solution for a given problem.
- setting up Azure pipelines for various projects
- updating and tracking Technical Health Tracker for all Android projects
- working on an example project that is used as a reference for all Android developers
- making up the guidelines for all Android developers to follow and to rely on whenever a new project is started or an existing one is refactored
- building standardized UI components that are to be used across all in-house projects
- performing code reviews and providing technical guidance in non-trivial tasks 
- building a technical onboarding flow for newcomers by shooting videos that explain technical aspects 
- overseeing standardization of Android components with in-house component library
- improved the code review process that pertained to all SE teams and not only mobile
- optimized the templates for the Azure pipelines of the mobile team to avoid duplication of effort when creating new pipelines
- writing custom scripts for Azure Devops pipelines that work with all build types and flavors of all projects

Android Tech Lead

Project: Edde Android Application
Role: Lead Android developer
Technologies: Kotlin, Coroutines, Flows, WebSockets, Navigation components, Android Jetpack, MVVM, Retrofit
Responsibilities: Writing a new application from scratch and leading Android development. 
 My responsibilities included: 
- laying the architectural foundation of the app with MVVM and designing it in a way that would be reactive to the interaction of WebSockets
- working closely with management and the design team to make better product decisions
- code reviews and mentoring teammates
- writing Python scripts to make parsing and importing of assets from private repos into the project 
- setting up the CI/CD proccesses via yaml files on Github Actions
- covering the app with tests

Lead Android developer

Seniordev

Project: BSafe Android Application
Role: Senior Android  developer
Technologies: Kotlin, Coroutines, Navigation components, Android Jetpack, MVVM, Retrofit
Responsibilities: Rewriting an outdated, legacy application from scratch. The application was hopelessly outdated and the decision was made to rewrite it from scratch. My responsibilities included: 
- making architectural decisions (MVVM) and laying the architectural foundation for the whole new app (state management, server interaction, tests, coding style and conventions) 
- setting up the process of code review
- setting up the git branching process
- implementing the test proccess from scratch (no tests written in the legacy app) and deciding on the convention that would be the base for all tests
-setting up the CI/CD proccess from scratch via Bitrise

Senior Android developer

Visonic

Project: Visonic mobile user applications
Role: Senior Flutter / Android  developer
Technologies: Flutter, Dart, Redux
Responsibilities: Developing user-facing and internal "installer" applications in Dart / Flutter.  Communicating with hardware on byte level. Encoding / decoding according to various codecs and message types. Using Redux architecture. The apps are used to communicate with client's panels (hubs) and to configure them. The panel (hub) interacts with client's security devices.

Senior Flutter / Android developer

Project: Aura
Role: Senior Android developer
Technologies: Kotlin, Java, LiveData, MVVM, Firestore, BLE, Dagger2, Retrofit2
Responsibilities: I've developed the UI and the back end (cloud) / Aura (local) integrations for several features. The communication in the app was happening via several channels including direct communication with Firestore, communication through Firestore functions exposed by our back end and direct communication to Aura hub via Bluetooth.

Senior Android Developer

Complete Software Solutions

Role: Project Manager, Android developer
Technologies: Kotlin, Dagger2, Retrofit2, Android architecture components
Responsibilities: I was responsible for the whole lifecycle of interaction with the client. I've negotiated with the clients and managed their expectations. I was responsible for forming technical requirements out of "non-technical" client specification. I ensured that extended teams that were working on other projects have everything that they need to perform their duties successfully. I supplied clients with additional human and non-human resources that they might need. I also worked as an Android developer on some projects. As a result of this we have launched around 10 projects from A to Z.

Owner

Project: Fortfrisk
Role: Android developer
Technologies: Kotlin, Java, Retrofit2, Dagger, RxJava, Stripe, Bitrise, Firebase
Responsibilities: I was responsible for building the app from scratch including figuring out the architecture to be used and the technologies. I also integrated the app with the Norwegian bankID system verification process, hooked up Stripe payment and crashlytics. The app required sophisticated security features, so I implemented various hashing algorithms to achieve safe entering of the app and communication with the server. I also single-handedly set up bitrise.io CI with testing. 

Project: Lavo
Role: Android developer
Technologies: Fresco, Picasso, Glide, Java, Retrofit, Dagger
Responsiblities: Since the app was mainly about videos / exchanging videos, a lot of the work consisted around building custom UI and views that would hold those videos / images and their efficient playback. During this project I've built custom view and their proper interaction with the rest of the UI layer. One of the challenges was to integrate a library that would allow to manipulate images and videos and then upload the result the most efficient manner possible. 

Project: Status
Role: Android developer
Technologies: Java, RxJava, Retrofit, Dagger, Content Providers, SQLite, GPS, Google Maps API
Responsibilities:  The app was taken over from a software house that the client previously used and was severely lacking documentation, so one of the biggest challenges was to establish a well-documented, clean codebase while developing new features and integration for the upcoming release.

Android Developer

Project: EMPS
Role: Junior Android developer
Technologies: Google Locations API, Google Map API, GPS, Java, Dagger, Retrofit
Responsibilities: Implementing the main screen's "compass" view that directed the user. Making up the correct formulas to position the compass in the right way according to the incoming data from the sensors. Building clusters of geofence points and parsing them in the way that is understandable to the user. 

Project: Ditio
Role: Junior Android developer
Technologies: Google Locations API, GPS, Java, Dagger, Retrofit
Responsibilities: Building the app according to the set up architecture from senior developers. Accessing the geolocation points of the user and testing the framework to ensure that it works according to design.

Junior Android Developer

Ciklum

Project: NAV Castle Education
Role: Junior Navision developer
Technologies: Microsoft Navision
Responsibilities: I set up machines with the necessary software for correct NAV development and learning. I also wrote the needed documentation and training materials for students. 

Project: Tecman Upgrade
Role: Junior Navision developer
Technologies: Microsoft Navision
Responsibilities: I was merging the customer database to the newest NAV version available. I was responsible for fixing bugs, errors and refactoring the code in the client database.

Junior Microsoft Dynamics Nav developer

🚀 Android Architect with a Decade of Mastery: For over 10 years, I've been at the forefront of Android development, pioneering solutions, architecting scalable applications, and leading teams to success. From concept to code, my journey has seen the creation of myriad apps from social networks to video editing tools, encompassing startups to global giants.

🔍 Problem-Solver at Heart: I'm innately curious – always diving deep into challenges to unearth foundational solutions. This isn't just about fixing bugs. It's about understanding the nuances, the whys, and the hows, ensuring we're not just treating symptoms but curing the root cause.

🌟 Tech Lead, Mentor & More: With my most recent role at Seven Peaks Software, I've guided 17 developers, streamlined Android development processes, and set benchmarks for best practices. Whether it's Azure CI/CD, Jetpack Compose, or Kotlin's intricacies, I've been the go-to expert, ensuring quality and innovation are at the forefront.

💡 Continuous Learner & Innovator: My tech stack is expansive – from Android's core to Flutter, Dart, and even Python and Node.js. With a plethora of certifictions, my commitment to upskilling is relentless. But it's not just about certificates – it's about practical implementation, and that's what I bring to the table every single day.

🤝 Collaboration & Communication: My journey hasn't just been about code. It's about bridging the gap between non-tech stakeholders and developers, ensuring clarity, setting expectations, and turning visions into tangible applications. With a stint as a CTO at Complete Software Solutions, I've overseen entire project lifecycles, ensuring clients' dreams are transformed into digital realities.

🔗 Let's Connect: Whether you're looking to build the next top-charting app, need consultancy on best practices, or simply want to chat about the latest in Android, I'm here. Reach out, and let's turn ideas into impeccable code!

Nikolay Miroshnychenko

If I had to name the single biggest benefit of Dependency Injection, 👉 it would be ease of refactoring. 

When you implement the DI pattern (or use Koin or Hilt) - you “decouple” concrete class implementations from each other. This makes your code very flexible 🤸 and less prone to mistakes when you’re changing it.  

More decoupled code 🟰  Less fear of change & less bugs 🟰 Faster development.

This post is the 3rd part of my series on Introduction to Dependency Injection — helping developers write cleaner, more maintainable code.

I’ll also leave the link to the previous two posts in this series in the first comment. 

👉 Follow me for more similar content!

#androiddevelopment #dependency #injection #refactoring #di #kotlin #koin #hilt #multiplatform

Mykola Miroshnychenko

I’ll teach you KMP! | Expert Android and KMP developer with 10+ years in Mobile | Koin community lead | JetBrains content creator

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