Simon Berglund, Developer in Stockholm, Sweden
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Simon Berglund

Verified Expert  in Engineering

Python Developer

Stockholm, Sweden
Toptal Member Since
July 20, 2015

Simon is a full-stack engineer with eight years of experience in mobile development and four years of Python development. He is an innovative and highly dedicated software engineer with excellent communication skills. He is known for his great instincts, entrepreneurial mindset, and ability to balance best practices and productivity while staying on budget. If a company wants high-performing applications, Simon is the guy.


App Shack AB
Lua, Java, JavaScript, PHP, Python, Django, Swift, Objective-C
Appanero AB
Corona SDK, Android, Java, Lua, Objective-C, iOS




Preferred Environment

Git, Docker, iOS, MacOS

The most amazing...

...thing I've built is an international electronic identity that allows users to authenticate and sign legal documents with their thumb.

Work Experience

Software Engineer

2013 - PRESENT
App Shack AB
  • Built several high-performing native iOS apps using the latest iOS frameworks and tools.
  • Interacted with existing and new clients regarding requirements, budget, quality, and customer satisfaction.
  • Developed and helped out on numerous native Android projects.
  • Created several high-performance back-end applications using Django and Docker.
  • Led and developed several iOS and cross-platform applications for many different clients using Native iOS, Flutter, and React Native.
Technologies: Lua, Java, JavaScript, PHP, Python, Django, Swift, Objective-C

Software Engineer

2013 - 2013
Appanero AB
  • Developed the application that later became known as "The Instagram of Hamburgers" using native iOS programming in Objective-C.
  • Built a 2D game that targets children from 2-10 years and aims to educate them on how the body functions.
  • Created a food recipe application for iOS using native iOS programming in Objective-C. It was released in the middle of the 5:2 diet hype and rapidly made it to the top in the Swedish App Store, where it stayed for nearly a week.
  • Developed a replacement for the native contact book in iOS. Using the platform, your contact details stay synchronized with all your and your friends' devices, thus eliminating the "Hey, I got a new phone, send me your number" problem.
  • Created an advanced RESTful API for a health and lifestyle application using C# with an existing core code layer written in MVC and ASP.NET. Additionally developed an Android application utilizing this API.
Technologies: Corona SDK, Android, Java, Lua, Objective-C, iOS

Länsförsäkringar Bank App

I was an influential iOS developer in a big, agile team at Länsföräkringar Bank AB. The app is continuously developed and maintained. Since its launch, it has won several major design and usability awards in Sweden.

FlexySun - A Complete Payment Platform for Solariums

With over one million transactions per year, FlexySun has become the new industry standard when it comes to payment solutions within the tanning business. FlexySun is a standalone, rebranded version of the FlexyPay App targeted exclusively for tanning facilities.

This piece of software is currently used by more than 200 companies in Sweden and Scandinavia. I was the lead full-stack software engineer for this project.

Freja eID - Electronic Identity
An electronic identity on your mobile that allows you to log in, sign, and approve transactions and agreements with your fingerprint or PIN. It also lets you monitor and control your digital activities. So not only does it make your digital life easier, it helps you avoid ID theft and fraud. And it’s all free of charge!

During spring and summer 2017, I reinforced the existing team of developers as iOS lead.

Though Freja is a product developed in Sweden, it was acknowledged on national Serbian TV.

I was a senior and lead iOS developer for this project.

FlexyPay App - Ultra Dynamic and Diverse Payments

I built the FlexyPay App as a highly dynamic and secure solution for handling mobile payments and facility access. It is an app that embeds all the powerful features of FlexyPay in an easily accessible and understandable mobile interface. One of its major areas of use has become unmanned stores. End users authenticate using the app and are either granted or denied access to the facility. When they are done and want to check out, they can use the app to pay for the goods that they picked up.

Because of the powerful identification features of FlexyPay, the store owners can feel confident in the visitors behaving as they should.

FlexyKey - Future of IoT
With the rise of 5G, microcomputers, and modern smartphone technology, IoT is becoming more and more a reality. Having the flexibility to read and control devices from a remote location dramatically improves interconnectivity and flexibility within many sectors of business, research, and, in the end, people’s daily life.

Combining these concepts with modern smartphone apps, directly available in everyone’s pocket, allows for highly efficient and convenient services.

I have, together with FlexAccess, developed a technology called FlexyKey, where efficient micro-hardware is combined with smart technology through a mobile app service.

The FlexyKey hardware allows web- or GSM-based controlling of up to 64 different electronic devices in a single unit. It’s a generic, flexible unit that supports a wide range of devices, such as vending machines, doors, gates, car washes, and golf carts, to name a few.

With simple adjustments, it can be adapted to almost any kind of system.

Assistans För Dig

React Native Developer. Building a complete mobile intranet for Swedish Personal Care company Assistans För Dig. I was responsible for architectural decisions and implementing pixel perfect design as the sole mobile developer in a team of five.

Livetree - Social Streaming Platform

I was responsible for the whole mobile development team.

The app is inspired by Netflix but contains almost exclusively indie content.

I implemented HLS technology for high-quality streaming over HTTPS, combined with Fairplay technology for secure media content delivery.

The client is based in the UK but the team was fully remote and distributed all across Europe.

Mobinix by Varningsinfo
I was an iOS developer for one of the most widely sold apps coming out of the Swedish App Store in 2016, Mobinix. Mobinix is a digital phonebook to help you determine wether a phone call is wanted or not.

Fritt Fram

Fritt Fram is a mobile application for chair-bound individuals where they can find places that fulfill their needs in terms of disability accommodations and availability.


A math game for kids to progress faster in math.
2010 - 2014

Master's Degree in Computer Science and Information Engineering

Uppsala University - Uppsala


REST APIs, Vue, Vuex


Ansible, Sentry, Xcode, Git, Jira, Fastlane, Sketch


iOS SDK, Django, React Native, Django REST Framework, Redux, Corona SDK


Python, JavaScript, Swift, Objective-C, Kotlin, Lua, Java, PHP


Cross-platform, DevOps, Scrum, Model View ViewModel (MVVM), MVC Design, Unit Testing, Database Design, Object-oriented Programming (OOP), Reactive Programming, Functional Programming


Docker, iOS, Android, MacOS


PostgreSQL, MySQL


Stripe Payments, WebSockets

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