Nikola is available for hire
Hire NikolaNikola Peric
Verified Expert in Engineering
Solutions Architect and Developer
Split, Croatia
Toptal member since February 28, 2014
Bio
Nikola is an experienced developer and problem solver. He has extensive experience with the Python ecosystem. He enjoys working in fast-paced environments and tackling real business problems. Nikola has a lot of experience working with multi-cultural distributed teams in various time zones.
Portfolio
Littlecode
C#, Azure, Angular, React, Claude Code, Agentic Coding, n8n, API Integration...
Freelance
Azure, Xamarin, ASP.NET, Android, .NET, Python, FastAPI, PostgreSQL, Redis...
Sarahah
Azure Cloud Services, Microsoft SQL Server, C#, ASP.NET, Entity Framework...
Experience
- Architecture - 10 years
- C# - 7 years
- Azure - 6 years
- PostgreSQL - 5 years
- ASP.NET Core - 2 years
- Agentic Coding - 1 year
- n8n - 1 year
- Claude Code - 1 year
Preferred Environment
Python, Redis, PostgreSQL, Django, Flutter, Claude Code, .NET, Azure, C#, Architecture
The most amazing...
...thing I've built is an Android game that has seen over 130,000 downloads.
Work Experience
Software Architect
2017 - PRESENT
Littlecode
- Helped the customer develop a digital farming solution.
- Managed the team of developers and other roles in their journey of project onboarding and yearly reviews.
- Architected solutions for various clients to aid in their business digitalization efforts.
Technologies: C#, Azure, Angular, React, Claude Code, Agentic Coding, n8n, API Integration, PostgreSQL, SQL, Robotic Process Automation (RPA), Agile Software Development, ASP.NET Core, ASP.NET MVC, Microsoft SQL Server, Windows, Xamarin.Forms, CTO, Back-end, Full-stack, Software Architecture, Integration, Automation, Solution Architecture, Enterprise Architecture, System Architecture, AI Architecture, Artificial Intelligence (AI), Security
Solution Architect and Developer
2011 - 2024
Freelance
- Worked on a Xamarin Forms application for a large enterprise client.
- Worked for an external client (Kiwi.com). Developed a few microservices in Python with an emphasis on scaling and performance.
- Developed pipelines that processed real-time data from flight providers and created new data streams that were pushed into the database and Redis cache.
- Migrated multiple apps from BlackBerry to Android.
Technologies: Azure, Xamarin, ASP.NET, Android, .NET, Python, FastAPI, PostgreSQL, Redis, SQLAlchemy, API Integration, Angular, React, Claude Code, n8n, SQL, Robotic Process Automation (RPA), Agile Software Development, ASP.NET Core, ASP.NET MVC, Microsoft SQL Server, Windows, Xamarin.Forms, Back-end, Full-stack, Software Architecture, Integration, Automation, Solution Architecture, Enterprise Architecture, System Architecture, AI Architecture, Artificial Intelligence (AI), Security
Sofware Developer
2017 - 2017
Sarahah
- Optimized a high-traffic web application. Introduced caching and load balancing.
- Fixed bugs that only appear in production environments while the system is under heavy load.
- Communicated closely with founders and Microsoft employee SQL experts. Fixed critical bugs that could lead to the whole system to stop functioning.
Technologies: Azure Cloud Services, Microsoft SQL Server, C#, ASP.NET, Entity Framework, ASP.NET Core, ASP.NET MVC, Back-end, Software Architecture
Software Architect
2009 - 2017
Itsistemi
- Developed desktop applications for the banking industry.
- Created a web (ASP.NET) reporting application based on SSRS and a bank invoicing application.
- Worked as part of a team responsible for part of a banking report system.
- Built a business process monitoring application for OTP bank using Silverlight, WCF, RIA Services, Entity Framework, and Windows service.
- Created a clone of Dropbox for a Croatian telecom company.
Technologies: Kofax, Microsoft Silverlight, Microsoft SQL Server, Mono, Android, C#, ASP.NET, .NET, SQL, Flask, Google App Engine, Google Cloud Platform (GCP), Semantic Kernel (SK), ASP.NET MVC, Windows, Back-end, Software Architecture, Integration, Automation, Solution Architecture, System Architecture
VB.NET Teacher
2009 - 2009
Ivora
- Taught a course on desktop application development.
Technologies: Microsoft SQL Server
Oracle Forms Developer, C# Developer
2007 - 2009
Infolink
- Created modules for an in-house ERP system.
- Created an application for the core business of insurance companies.
- Developed background analysis on an Oracle database for Privredna Banka Zagreb. It was intense use of Oracle PL/SQL programming language.
- Implemented an ASP.NET web bug tracking application. Responsible for application customization and implementation of API for connecting more legacy technologies.
- Created a simple in-house ORM tool.
Technologies: ASP.NET, C#, Oracle SQL, Back-end
Web Developer
2004 - 2008
Delta Trend bvba
- Used JavaScript for custom UI behavior.
- Achieved valuable experience working in an international team of programming professionals, where the key to success was accountability of every team member.
- Created a custom web reporting tool.
- Created a custom Excel export component.
- Implemented security features.
Technologies: ASP.NET
Web, Desktop, and Mobile Developer
2002 - 2007
Heron Electronic d.o.o.
- Developed desktop and web applications on Windows. ERP modules were developed using various technologies in various programming languages. SQL Server 2000 was used for the relational database.
- Independently designed and programmed a Palm OS application from the beginning to the very end. It was a part of the ERP system for collecting data about water consumption on terrain (work order, synchronizing with SQL Server database).
- Gathered accounting and business knowledge needed for designing ERP system and to understand user needs for customization.
- Supported legacy VB6 ERP.
- Helped in the design of a custom reporting tool.
Technologies: Microsoft SQL Server, C++, C#, Windows
Experience
Ponuda Dana
Android app for group shopping and coupons.
https://play.google.com/store/apps/details?id=hr.ponudadana.aapp
https://play.google.com/store/apps/details?id=hr.ponudadana.aapp
I Love Funny Dogs
Android application as a companion to the Facebook page.
SVN Notifier
Android application for notification of SVN commits.
Pet Premium
Android application for supporting the pet insurance business.
Slenky
Client for Slenky social network.
Sudoku Game for BB10
Sudoku game for BlackBerry 10 platform.
Battleship Game
Battleship game for BlackBerry 10.
Friend Arkanoid
Arkanoid clone built while learning Unity 3D.
Sarahah.com Back-end
Optimizing, debugging, and developing new features on the existing Sarahah.com back-end.
Xarvio Field Manager
https://www.xarvio.com/Xarvio Field Manager is a Xamarin and MAUI application supporting digital farming. The system supports farming decisions backed by machine learning models. It has complex integrations with farming machinery like John Deere tractors and other smart farming hardware.
Certifications
MAY 2015 - PRESENT
Microsoft Specialist: Programming in C#
Microsoft
MAY 2015 - PRESENT
Microsoft Certified Professional
Microsoft
Skills
Libraries/APIs
.NET BCL, Android API, Facebook API, SQLAlchemy, Entity Framework, React
Tools
Microsoft Visual Studio, n8n, Claude Code, Microsoft Silverlight, Git, Flash
Languages
C#, Python, Java, JavaScript, SQL, C, C++
Frameworks
.NET, ASP.NET Core, ASP.NET MVC, ASP.NET, Mono, .NET MAUI, Android SDK, Flask, Django, Flutter, Angular
Paradigms
Object-oriented Design (OOD), Object-oriented Programming (OOP), Agile Software Development, Automation, Distributed Programming
Platforms
Azure, Xamarin, Android, Windows, Windows Phone, Google Cloud Platform (GCP), SharePoint, Google App Engine, iOS
Storage
Microsoft SQL Server, Oracle SQL, PostgreSQL, Redis, Azure Cloud Services
Other
Xamarin.Forms, FastAPI, API Integration, Architecture, Agentic Coding, Back-end, Full-stack, Software Architecture, Integration, Solution Architecture, System Architecture, UiPath, Robotic Process Automation (RPA), Semantic Kernel (SK), CTO, Enterprise Architecture, AI Architecture, Artificial Intelligence (AI), Security, Kofax, Reverse Engineering, Aiohttp
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