Adrian Lesniak

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ABOUT ME

Senior Mobile Engineer | Android | Web Technologies | Best practices

6 years of experience working with Android and web technologies on projects from a wide range of industries - 3D, gaming, digital agencies, social media, investments and banking.

I am available to take on projects big or small, and offer help with Android development, OOP, Java, Kotlin, responsive UI, networking, RESTful APIs, Dagger, RxJava, testing, RESTful APIs, Location services, Firebase or complete solutions for creating backend services for your applications. I will be able to walk you through the necessary steps for you to succeed.

I maintain my level of expertise by constantly staying up-to-date with new technologies and trends, programming languages, coding practices, blogs, personal projects, forums.

Oracle Certified Associate, Java 7 SE Programmer.

Polish, English

London (+00:00)

Joined May 2017

EXPERTISE

Android

6 years experience

6 years of extensive professional experience building Android applications with Java and Kotlin for a wide range of industry sectors. Pro...

6 years of extensive professional experience building Android applications with Java and Kotlin for a wide range of industry sectors. Proficiency in using related technologies and libraries. Location services, RESTful APIs, dependency injection, networking, threading, responsive UI, Coordinator Layout, Accessibility, Firebase, Room, Jetpack, MVP, MVVM, MVI, Gradle

Android Studio Android Fragments Java Kotlin Android SDK Android Layout Dagger 2 Retrofit RxJava

Java

6 years experience

Extensive experience working with Java on Android. Oracle Certified Associate, Java 7 SE Programmer

Java Java 8Multithreading

Java Java 8MultithreadingStreams Collections

Kotlin

4 years experience

Extensive experience working with Kotlin on Android.

Android

Node.js

4 years experience

Proficient in creating mobile friendly RESTful backend services that work with databases for data persistence. Hosting web applications ...

Proficient in creating mobile friendly RESTful backend services that work with databases for data persistence. Hosting web applications on AWS infrastructure or Heroku.

RESTful API Express.js Back-End

RESTful API Express.js Back-End AWS PostgreSQL Postman Heroku MongoDB Redis

Angular 2

2 years experience

Proficiency working with Angular framework and TypeScript creating web applications that work well on all screens and sizes. Progressive...

Proficiency working with Angular framework and TypeScript creating web applications that work well on all screens and sizes. Progressive web applications that utilise web technologies and the power of service workers to create fast and reliable cross-platform applications.

Git

6 years experience

Git has becoming an indispensable tool in every organisation, I have worked extensively with Git, whether it is through command line or G...

Git has becoming an indispensable tool in every organisation, I have worked extensively with Git, whether it is through command line or Git clients such as Github Desktop, SourceTree or Android Studio own built-in client.

Git flow GitHub

Unit Testing

5 years experience

I practise TDD as I recognise the value of well tested codebase. I spend a lot of time crafting unit tests which give me confidence that ...

I practise TDD as I recognise the value of well tested codebase. I spend a lot of time crafting unit tests which give me confidence that my code fulfils business requirements.

JUnit

REVIEWS FROM CLIENTS

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SOCIAL PRESENCE

GitHub

LoadIndicators

Load indicators library

Java

RotatingCircleView

Java

Community Posts

Refactor your Kotlin code with built-in extension functions

Today at work, I was fixing a bug in a Kotlin code which has been written some time ago. At a first glance, there was nothing obvious that stood out: kotlin fun getTrimmedPropId(propId: String):...

Handy Code Template for Android custom views

Make use of code templates in your IDE to make you more productive

EMPLOYMENTS

Senior Android Engineer

RBS Group

2019-01-01-Present

Working on award-winning mobile banking applications that belongs to RBS Group. Responsibilities include working and maintaining a large ...

Working on award-winning mobile banking applications that belongs to RBS Group. Responsibilities include working and maintaining a large codebase, refactor existing features to a MVVP pattern, unit testing critical business logic, code reviews, pair programming.

Android

Java

Unit Testing

Android

Java

Unit Testing

Jenkins

Gradle

Continuous Integration

Firebase

Dagger

RxJava

RESTful API

Android Engineer

Nutmeg

2018-01-01-2018-12-01

Market leading intelligent robo-investment platform offering ISA, Junior ISA, pension products. Developing and maintaining a native Andr...

Market leading intelligent robo-investment platform offering ISA, Junior ISA, pension products. Developing and maintaining a native Android client in a team of 3, using Kotlin programming language. Responsibilities include working with MVP and Dagger 2 architecture, implementing new features and refactoring code base, working with Gitflow branching model, creating highly reusable and complex custom components, unit, UI and integration testing (JUnit, Mockito, Espresso), code reviews, pair programming and knowledge sharing, daily standups, spring planning and retrospectives sessions

Android

Git

Unit Testing

Android

Git

Unit Testing

Android Studio

Retrofit

Dagger

Git flow

RxJava

Model-View-Presenter

Android Engineer

Campus Society

2017-03-01-2017-12-01

A social networking platform for students with over 300,000 active users. The platform allows students to communicate via group chats, on...

A social networking platform for students with over 300,000 active users. The platform allows students to communicate via group chats, one to one chats, create collaborative groups and channels, post media files. Leading an Android team of 3 developers, managing tasks and carrying out interviews with candidates. Responsibilities include working with RESTful web service APIs (Retrofit, OkHttp), managing release lifecycle, adopting Kotlin programming language, Unit testing (JUnit, Mockito, Espresso), collaborating with a UX/UI team, maintaining clean codebase, daily stand-up meetings and bi-weekly sprint planning

Android

Git

Unit Testing

Android

Git

Unit Testing

Continuous Integration

Android Studio

Retrofit

Dagger

PROJECTS

Analog TachometerView Project

2016

Custom drawn analog tachometer.

Android

Android Studio

Custom view

Android

Android Studio

Custom view

Basic Unit ConverterView Project

2013

Simple, user-friendly and modern-looking unit converter which support 7 most common measurement units to choose from.: - Temperature - We...

Simple, user-friendly and modern-looking unit converter which support 7 most common measurement units to choose from.: - Temperature - Weight - Length - Area - Volume - Speed - Time

Android

Android Studio

Android

Android Studio