Full Stack .NET Developer

Lennart Poot

Contact

Flexible / Spain (Málaga)

Profile

Full Stack .NET Developer with solid hands-on experience building and maintaining business-critical applications, integrations, and scalable systems.

Experienced across domains including healthcare, e-commerce, fintech, maritime, and proptech. Strong in translating functional requirements into practical technical solutions and delivering reliable software in both freelance and team environments.

Combines development expertise with business awareness and a pragmatic, delivery-focused mindset.

Skills

Core Technologies

C#, .NET, ASP.NET Core, Web APIs, WPF, MVC, Blazor

Frontend

Angular, TypeScript, JavaScript

Databases

SQL Server, PostgreSQL, MySQL/MariaDB, MongoDB, Oracle

Cloud & DevOps

Azure DevOps, AWS, Docker, Kubernetes, CI/CD, Git, Agile/Scrum

Architecture & Practices

REST APIs, Microservices, Clean Architecture Unit & Integration Testing, ORMs (Entity Framework, Dapper) Messaging Systems

Languages

Dutch/English:
Fluent

Spanish / Portuguese: Advanced

German: Intermediate

Additional Strenghts

Business understanding, requirement translation, stakeholder communication, pragmatic solution design

Work Experience

Experience across healthcare, e-commerce, fintech, maritime, and proptech environments.

Full stack .NET Developer (Freelance)

Selfcare BV (Healthcare)

2024 - Present

Develop and maintain a healthcare platform using .NET APIs and Angular
Build integrations and improve system reliability through automated testing and CI/CD
Contribute to scalable backend systems using Docker, Kubernetes, and modern DevOps practices
Work in a structured environment using Azure DevOps, GitFlow, and distributed teams

.NET Developer

Coolblue BV (E-Commerce)

2022 - 2024

Developed and maintained .NET applications supporting logistics and delivery systems
Contributed to systems processing up to 35,000 orders per day across multiple countries
Improved performance and cost-efficiency through AWS pipeline optimisation
Worked within Agile teams using Scrum, Jira, and modern CI/CD tooling

Software Engineer (Freelance)

Blanco Fintech BV (Finance)

2021 – 2022

Maintained and extended an asset management platform handling millions of records
Implemented integrations with multiple European banks for automated financial data processing
Delivered features while ensuring system performance and data reliability
Worked across PHP, MySQL, and frontend technologies in a complex environment

Full Stack .NET Developer (Freelance)

LoadGeni BV (Maritime Software)

2019 – 2021

Developed a WPF/.NET application for cargo calculations on LNG/LPG vessels
Designed offline-first functionality for reliable use in low-connectivity environments
Implemented unit testing, MVVM, and structured architecture for safety-critical software
Delivered a system used in real-world maritime operations

Full Stack .NET Developer

LettingWeb Ltd (Real Estate / PropTech)

2017 – 2019

Developed features for a platform used by 800+ estate agents and 8,000+ listings
Built a tenancy contract system in .NET Core with DocuSign online signature integration
Contributed to backend systems, APIs, and frontend improvements
Delivered continuous product improvements within a small development team

Early Career — Full stack developer & founder

Built and delivered custom web applications across a wide range of industries in both freelance and employed roles, including founding and running a small internet agency.

Developed full stack applications using .NET, PHP, SQL, and modern frontend technologies
Delivered end-to-end solutions from requirements and design to implementation, deployment, and maintenance
Worked with clients across sectors including education, media, e-commerce, finance, and healthcare

Selected highlights:

Built a student platform managing 1M+ results and generating thousands of diplomas (Zadkine)
Developed a global video platform and CMS for VPRO / MetropolisTV
Created e-commerce systems used by tens of thousands of users, including payment integrations (iDEAL)
Built contract, invoicing, and benchmarking systems for international organisations
Developed scalable web platforms for well-known brands including Pandora and Desiree

Includes experience at:

Twing IT (Founder) and various development roles at agencies and client projects

Education

Rotterdam University of Applied Sciences

Bachelor of Science (BSc) in Computer Science 2008