Available to hire
I am an experienced .NET Developer with over 25 years of experience designing and building software solutions. I have a strong focus on backend development using .NET Core and MS SQL, with additional expertise in frontend frameworks such as Angular, TypeScript, and HTML.
I am analytical and detail-oriented, with a background in applied mathematics that helps me design and optimize complex databases and solve challenging technical problems efficiently. I moved to Spain in July 2025 and am seeking remote freelance opportunities, preferably up to 32 hours per week.
Skills
See more
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
Dutch
Fluent
English
Fluent
Norwegian
Fluent
Work Experience
Technical Writer at Desan Research Solutions
January 1, 2026 - PresentTasked with rewriting the user manual and proposing improvements; produced a bilingual help site at https://help.desan.nl and documented bugs, improvements, and suggestions.
.NET / Frontend Developer at Desan Research Solutions
January 1, 2022 - January 1, 2025Worked with C#, TypeScript, and Angular to build large-scale questionnaire systems for major clients. Contributed to code deployment, release notes, and user documentation. Made the entire application multilingual.
SQL Developer at Valvan
January 1, 2021 - PresentOptimized database performance.
.NET Developer at (Anonymous Client)
January 1, 2021 - PresentMaintained and enhanced Windows applications involving complex mathematical calculations.
.NET Developer at GS1 / Fabrique
January 1, 2021 - January 1, 2022Developed a WebAPI project and later helped build an Umbraco-based website.
.NET Developer at Erdotex
January 1, 2020 - January 1, 2020Developed and maintained a Windows application to manage shipments and orders for textile collection and sorting operations.
.NET Developer at Area of People
January 1, 2019 - January 1, 2019Developed an app and CMS for communication among residents in large apartment complexes.
.NET Developer at Soworker
January 1, 2019 - January 1, 2022Developed and maintained a social media content-sharing platform with numerous API integrations.
Developer at Downkern
January 1, 2019 - January 1, 2019Developed a small WordPress project.
.NET Developer at Dichtbij / TMG
January 1, 2018 - January 1, 2018Migrated articles from the old website to the new platform.
.NET Developer at (Anonymous Client)
January 1, 2017 - PresentResolved API socket issues in Azure environment.
.NET Developer at Sleeptrade / Beddenspecialist
January 1, 2017 - January 1, 2023Developed CRM and analysis systems combining sleep sensor data and intake forms to match customers with suitable products.
.NET Developer at Xuntos
January 1, 2016 - January 1, 2016Assisted in completing an Umbraco/Angular website.
.NET Developer at VisionsConnected
January 1, 2016 - January 1, 2017Developed a custom MS Outlook plugin within budget and time.
.NET Developer at Powerpeers
January 1, 2016 - January 1, 2016Worked on websites using MVC and Umbraco; provided SEO optimization.
.NET Developer at 5CA
January 1, 2015 - January 1, 2018Developed billing and tracking systems integrated with multiple external APIs.
.NET Developer at Van Helder
January 1, 2015 - January 1, 2019Built a system to read energy usage from smart meters and a lead system with web data scraping.
Database Specialist at Visma
January 1, 2014 - PresentAdvised on database performance issues.
.NET Developer at VisSim
January 1, 2014 - January 1, 2014Developed software to detect vessels near oil rigs with a focus on accuracy and logging.
.NET Developer at Dichtbij / TMG
January 1, 2014 - January 1, 2016Backend and frontend development, SEO improvements, and sprint planning.
SEO Specialist at SEO Projects, TMG
January 1, 2013 - January 1, 2016Created optimization reports with recommendations.
.NET Developer at TNO
January 1, 2013 - January 1, 2013Created a C# application exposing encrypted data as a JSON REST service.
.NET Developer at UseLab / Honeywell
January 1, 2013 - January 1, 2013Rebuilt the Honeywell website with a designer and frontend developer.
.NET Developer at Haarshop.nl
January 1, 2013 - January 1, 2013Integrated backend systems with shipping and newsletter modules via services and APIs.
.NET Developer at DutchBrite
January 1, 2013 - January 1, 2013Improved database performance and made frontend updates.
.NET Developer / Architect at D-Reizen
January 1, 2013 - January 1, 2013Built the framework and caching system for the company’s new website with focus on SEO and performance.
SEO Specialist at TMG
January 1, 2013 - January 1, 2016Created optimization reports with recommendations.
.NET Developer at RTL
January 1, 2012 - PresentDeveloped a CRM data retrieval application.
.NET Developer at Bluedesk / E.ON
January 1, 2012 - January 1, 2012Developed an application for calculating potential energy savings and costs.
Founder / Developer at Touretappe.nl
January 1, 2012 - January 1, 2024Developed and managed a high-traffic cycling website, attracting over 100,000 daily visitors. Responsible for all technical aspects, ensuring optimal performance and strategic search-engine visibility. By aligning SEO efforts with peak periods—such as ranking highly for the Tour de France during June and July—I gained deep expertise in SEO, algorithmic behavior, and the underlying mathematics and logic that drive search performance.
Senior Developer / Team Lead at Coca-Cola 125 Years
January 1, 2011 - PresentLed development of a promotional website integrated with payment and order systems.
Freelance Developer at GridLine
January 1, 2011 - January 1, 2011Supported various .NET applications.
.NET Developer at Nederlandse Energie Maatschappij
January 1, 2011 - January 1, 2012Maintained systems for daily data imports and energy usage calculations.
Senior Developer / Team Lead at Eredivisie Live Shop / Nedconcepts
January 1, 2010 - January 1, 2011Led development of an online shop and subscriptions.
Senior Developer at GridLine: ZegelGezond
January 1, 2010 - January 1, 2010Developed a medical website review platform.
Senior Developer at I-Company: Eredivisie Live Shop / Nedconcepts
January 1, 2010 - January 1, 2011Built online shop and subscription systems integrating with external providers.
Project Leader at GridLine
January 1, 2009 - January 1, 2010Created technical specifications and supervised students.
Senior Developer at Interance
January 1, 2008 - January 1, 2008Managed technical aspects of insurance software and update scripts.
Senior Developer at DataNova AS
January 1, 2008 - January 1, 2009Developed e-commerce ticketing systems for online purchases.
Senior Developer at Norwegian Sports Federation (NIF)
January 1, 2005 - January 1, 2008Developed a major administrative system for managing members, events, and results.
Developer at Communicate Norge
January 1, 2002 - PresentWorked on a Java-based paper production application.
Web Developer at MarkedsPartner
January 1, 2002 - January 1, 2005Developed CMS-based websites for small and medium companies.
Senior Developer at Granitt AS
January 1, 2000 - January 1, 2002Led several web projects.
Developer at Geos
January 1, 1999 - PresentContributed to a Euro conversion project for Interim Justitia.
Developer at Elvia and FBTO Insurances
January 1, 1997 - January 1, 1999Worked on insurance administration systems.
Student Assistant at University of Groningen
January 1, 1993 - January 1, 1996Student assistant duties.
Education
Applied Mathematics at University of Groningen
January 1, 1992 - January 1, 1997Applied Mathematics at University of Groningen
January 1, 1992 - January 1, 1997Qualifications
Industry Experience
Software & Internet, Professional Services, Media & Entertainment, Education
Skills
See more
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Hire a Developer
We have the best developer experts on Twine. Hire a developer in Alicante today.