Xavier Potau

Hi! My name is Xavier Potau

I am a full stack developer providing professional web and software development services catering to a diverse clientele, ranging from small entrepreneurs to commercial businesses.

About Me

I am a fullstack developer skilled in .Net MVC, Dynamics Nav and PHP, althought I have gathered a great deal of knowledge in many other disciplines over the years, both frontend and backend. I am passionate in creating interactive and beautiful user friendly interfaces along with robust and efficient supporting architecture. With a background in Computer Sciense and Multimedia my ability as a full stack developer allows me to create everything, from small business websites to custom web and software applications.

I have over 29 years of proven experience as a web and software developer, delivering software solutions and web and mobile applications that make life better for a range of businesses, including solo founders, start ups, manufacturing automotive companies and aviation and vehicle leasing enterprises.

I offer my services as a full stack developer for hire to work with businesses of all sizes. Feel free to get in touch. I’m available during the week to discuss and advise on your project or development needs.

Skills & Experience

“I may not have gone where I intended to go, but I think I have ended up where I needed to be.” – Douglas Adams

What is a Full stack developer?

A full stack developer possesses the skills and expertise to transform an idea into a completed product. They should be proficient in both front-end and back-end development.

Front-end developers focus on creating the parts of an application that users interact with and see.

In contrast, back-end developers handle the behind-the-scenes components, including the core logic, servers, and databases that users don’t directly engage with.

Work

Development Projects

  • Master Data Manager for Leaseplan

    August 2023 to Abril 2025 – Associated with Leaseplan IS Ltd.

    Leaseplan (now https://www.ayvens.com) is a leading vehicle leasing company based in Amsterdam.

    Linked with the Service Integrated Management System data requirements a separate project was launched to create an application to manage supplier and vehicle data where the data could not be managed by external parties. The fullstack project was built with .Net Core v8 using Blazor and Radzen components with a PostgreSql database. Integrated with Amazon S3 for document management for bulk imports.

    Skills: .NET Core · Blazor · Radzen · PostgreSQL · pgAdmin · Amazon S3

  • Service Integrated Management System v2 for Leaseplan

    Nov 2019 to Abril 2025 – Associated with Leaseplan IS Ltd.

    Leaseplan (now https://www.ayvens.com) is a leading vehicle leasing company based in Amsterdam.

    New version for the Leaseplan’s RMT service management application. Built upon the ideas of its predecessor the project was rebuilt from scratch using newer technologies improving it’s performance and effectivity. The application was divided in FrontEnd and Backend, the frontend in React being taken care of by another team. The Backend project was fully built on .Net Core v8, using microservices approach including multiple 3rdparty integrations and builtin unit testing. The solution was divided in several projects, including the engine, builtin Business Rules project and additional microservices (inbound, outbound, nservicebus, opensearch, etc). The application was connected to external integration via REST services (GTMotive, AAG, Eucon, iValua, GlobalDataHub, Amazon S3, MarketingCloud, Finance, FleetOps, Salesforce, Invoicing, and Leaseplan’s propietary Licensing systems). Backend databases managed by EntityFramework on SQL Servers.

    Skills: .NET Core · Microsoft SQL Server · Transact-SQL (T-SQL) · Nservicebus · RESTful WebServices · Entity Framework · Unit Testing · Swagger API · Gitlab · Continuous Integration and Continuous Delivery (CI/CD) · Jira

  • Service Integrated Management System for Leaseplan

    Apr 2017 to Abril 2025 – Associated with Leaseplan IS Ltd.

    Leaseplan (now https://www.ayvens.com) is a leading vehicle leasing company based in Amsterdam. Leaseplan’s global RMT (Repair, Maintenance and Tyres) application to manage vehicle service. The application was available both for internal and external users (suppliers). Frontend was built with .NET MVC and Kendo Framework, while the backend engine was run by a Metastorm BPM on SQL Server databases. Highly integrated via inbound and outbound SOAP and REST services with 3rdparty providers (Eucon, GTMotive, Salesforce and a dozen Leaseplan’s Licensing systems across the globe running on iSeries/AS400 systems). The solution was split in separate .Net projects from frontend to several web APIs and windows services. It also included internal integration with business rules system based in Java/Eclipse called “VisualRules”.

    Skills: .NET Framework · ASP.NET MVC · ASP.NET Web API · ASP.NET Core · Powershell · Windows Services · Windows Server · Microsoft SQL Server · Transact-SQL (T-SQL) · SOAP · REST · iTextSharp · PostMan · SoapUI · Business Rules · Business Requirements · Jira · Bash · Gitlab · AJAX · Kendo Ui · Entity Framework · Bitbucket

Explore more projects I’ve worked on

Websites

Over the years, as a freelance full stack developer, I have developed multiple websites for clients ranging from sole entrepeneurs to commercial international groups. The projects varied as technology evolved, from sites built with just raw html, css and javascript frameworks to more complex Content Management Systems built with platforms from Joomla to Wordpress, Magento and Drupal (depending on the customers requirements and project complexity). In some cases accompanied by custom tailored programmed mods to catter for specific functionalities.

www-joanmf-com
www-cynara-net
www-ecoclassroom-org
www-veritasfilm-es
www-cashew-intl-com
www-caro-nut-com-corporate
www-annaguardiola-com
www-compartia-net
www-jaraadvocats-com
www-caro-nut-com
www-examsbaixcamp-com
www-towerenglish-net
www-candor-ags-com
www-ginyreus-cat
www-englishclassesreus-com
www-divulgamusic-com
sysco-helpdesk-portal
www-patufetsverds-com
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Things people say

I had the pleasure of working closely with Xavier at Ayvens for many years, and I can confidently say that he is an exceptional developer with a strong technical acumen. He worked on, and made a significant contribution to the success of one of our core products supporting a critical business process at the heart of our leasing operations.

During our time working together, Xavier demonstrated an in-depth understanding of backend technologies, particularly with .NET frameworks such as C# and ASP.NET Core. He consistently delivered high-quality code while following best practices and maintaining a strong focus on scalability, performance, and security.
What truly sets Xavier apart, though, is his ability to approach complex problems with a calm and methodical mindset. Whether it was debugging a critical production issue or optimizing an existing system, he approached each challenge with both technical expertise and creativity, resulting in reliable, efficient, and maintainable solutions.

In addition to his technical skills, Xavier is a great team player. He has a collaborative spirit, always willing to help his peers troubleshoot issues and share knowledge. His excellent communication skills and positive attitude made him a pleasure to work with, and I am confident that he will be a great asset to any team.

Andrew Burton. Global Product Lead | Vehicle Operations at ALD Automotive | LeasePlan Digital

I had the pleasure of working alongside Xavi for the past seven years, during which he consistently demonstrated exceptional expertise as a Senior Software Developer (.NET stack). His deep knowledge combined with his problem-solving skills, made him an invaluable team member. Xavi is a strong collaborator, an excellent mentor to junior developers, and always ensures high-quality, scalable software solutions. His work ethic, adaptability, and proactive approach allow him to excel in challenging projects. I highly recommend him for any senior development or leadership role.

Konrad Cwalina. Senior Software Engineer/Tech Lead at Leaseplan/Ayvens

I have worked with Xavier for over four years in the same team, with eight months of that time spent having him as my team manager. During this period, Xavier consistently demonstrated a high level of expertise. Even though we didn’t share the same technology stack, he always provided valuable advice and insights that helped me approach challenges effectively.

As my manager, Xavier was incredibly supportive. He was always available to offer guidance, answer questions, and ensure that both my work and the team’s progress were well-supported. His leadership also fostered a collaborative and positive team environment.

Xavier is highly knowledgeable, professional, and a pleasure to work with.

Fernando Aller. Senior Software Enginner at Leaseplan

I had the pleasure of working with Xavier while at Green Seed Group. Xavier is a highly creative individual who consistently brought new ideas to the table. He was based in Spain working on a branding project for America with me and never let the distance get in the way of the project timelines.

Xavier is considerate, professional and a pleasure to be around.

Heather Iafrate. Senior Brand Manager at Green Seed Group.

Xavier is a highly creative and motivated professional. He’s constantly updated on new IT developments and global trends which makes him a reliable and proactive professional. On top of this, he is generous, flexible and a great team contributor, ensuring the success of the projects he is involved in.

Magda Barceló. Founder/coach/consultant at Equilibra Consulting.

I’ve been working for a while with Xavier when he was at Candor, as a member of the Hothouse team (developers of corporate marketing) and I can say that Xavier made a really impressive great job with our company websites, bringing new ideas to the group thanks to his wide experience and developing and excellent group website.
Also, let me tell you that Xavier is a wonderful person to work with, very professional, proactive, creative, with plenty of innovative ideas, and a really nice person, always willing to help people.
So if you have the chance to work with him, don’t let it pass away!

Oscar Garriga Gual. General Manager at Candor-AGS Mexico.

Xavier is my trust software consultant.
He has a large experience in website designs and Apps, but if I have other needs in software, I also ask him because he is always helpful. Even if it is not his field he helps me to find the proper supplier.
Reliable, hard worker, customer focused, and easy going person to work with.
He has helped me for long time, and I hope we will continue having his assistance in the future.

Gemma Capella Roca. Europe Sales Manager

Working with Xavier has been a very nice experience. In particular I would highlight his problem-solving skills (which he applies in an effective and diligent way), ability to deal with customers and provide solutions and his capacity and willingness to self-learning.

David Jiménez López. Co-Founder at Universal Customer.

Working with Xavier has been a very nice experience. In particular I would highlight his problem-solving skills (which he applies in an effective and diligent way), ability to deal with customers and provide solutions and his capacity and willingness to self-learning.

Miquel Garcia-Fernandez. Co-Founder & CTO at Crecube.

We hired Xavier as a developer for ecoclassroom.org, a product from a Youth Innovation Fund from the World Bank. Xavi was extremely professional, timely, problem solving and patient with our constant changes. He adapted the CMS to what we needed. When he realized that the CMS would not fully support us as we would in the future, he re-did the site using Joomla without us even asking, and not charging any more for his time. This shows an integrity and dedication to his work not so easily found on web contractors. I fully reccommend Xavier as a web developer.

Andrea Alarcón. Web producer/coordinator at The World Bank.

I’ve requested Xavier’s services for a couple of technical projects I’ve been engaged in. He’s been extremely efficient, adaptable to different technologies, creative and has provided great value.

I highly recommend Xavier for technical projects that require creativity and organization skills.

America Grau. Communications and Web consultant at The World Bank.

I worked with Xavier for several years developing and supporting the Microsoft interal MBS Navision based billing application. He was was a very valuable data analyst when we were troubleshooting complex data issues, while he was based in Dublin and I was in Denmark, but also when we were colocated in Denmark and in the war rooms in Dublin. Our online cooperation ws great and problems got solved fast. His SQL and Navision skille was a great help.

Carsten Nærvig Sørensen. Software Development Engineer at Microsoft Denmark.

Xavier is passionate about technology and is a go do person. Xavier is using his strong analytic skills to solve complex issues with focus on quality. Xavier solves difficult problems by thinking through the solution and ensuring positive impact on business operation. Xavier has great interpersonal skills. Shows respect for individuals in all situations, modeling this behavior for others.

Henrik Bergholt. Program Manager at Microsoft Denmark.

I would highly recommend Xavi as a skilled and professional IT Expert. His strengths are his willingness to pursue best practice and deliver results on time. He has the ability to think out of the box and a great team player. Xavi possesses a wealth of knowledge and experience which spans across several Applications and Technology. He is cool, calm with a likeable personality, an asset to any organization or venture. Xavi helped me ramp up while on the Microsoft Business Team.

Anthony Ekpechue. SharePoint/Dynamics NAV Production Engineer at Microsoft

Xavi is a very good worker. He always gave the right service in the right time for any IT problems I had. Xavi has a high IT knowledge.

Xavi Paba. CIO at Manusa

Xavier is a an outstanding person with an excellent work ethic, sense of responsibility, and desire to perform his work with the highest quality possible. During the time I had the opportunity with him at ASM, he carried his work as IT support manager with diligence and always aware of the consequences of his activities having a positive impact on the operations of the company. In summary, an excellent professional who knows his profession in and out.

Albert Redo-Sanchez. R&D and IT manager. ASM-Dimatec

Xavier is very dedicated and analytic about the work he does. He has an abillity to adobt quickly and work with a variety of people.

Henrik Rue. Business Solutions User support at Microsoft Denmark.

Xavi was my counter part in Microsoft, Europe supporting critical business applications that enables customers, partners and business. He was a fantastic resource to work with, always available to help the team and drive the issues to closure. He is technically strong, a good team player and a sporty guy. I will always like to have him in my team and wouldn’t think twice to recommend Xavi’s work to anybody.

Arulvel Rajan. Lead engineer at Microsoft

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I bring your ideas to reality

Website development

From personal or small business sites created with Wordpress to highly tailored and integrated website solutions with .Netcore or PHP.

Software development

With extensive expertise developing business management solutions I provide tailored software programming to help your business grow its in-house software and web applications.

Mobile App development

Experience mobile and app solutions that gamify your services or increase your productivity. Cross planform development with Unity or Godot.

Multimedia

Videography and photography on demand to bring color and life to your products and ideas.

Consulting

Provide assistance coming up with new effective solutions, tweak existing processes or offer new honest and critical advice to increase productivity.

Continuous Support

I offer my investigative nature to provide high tier troubleshooting with dedicated commitment and long lasting support.

“If you want to make an apple pie from scratch, you must first create the universe.”

Carl Sagan

Get in contact