Throughout my career, I have had the opportunity to work on a diverse range of projects, from building secure integration layers for enterprise systems to architecting scalable serverless applications in the cloud. Below, I have highlighted some of the key projects where I have made a measurable impact, showcasing my expertise in Kotlin, cloud-native solutions, and backend development.

Recent Projects

Secure Event-Driven Financial Integration System for Pension Administration

Employer: AZL (NN Group)
Role: Lead Software Engineer / Kotlin Tech Lead
Dates: 2023–Present
Tech Stack: Kotlin, Azure Functions, Azure Service Bus, Azure Event Hubs, Azure Blob Storage, Azure Cosmos DB, Spring Boot, Spring Cloud Function, OAuth2, mTLS, IntelliJ, Azure DevOps, Git

Problem: In response to the Dutch government’s New Pension Law requirements, the organization needed to replace its aging on-premise Oracle system with a modern, scalable solution on Azure. The new system required robust security and compliance to handle pension-related data across diverse internal and external systems.

My Role: Leading the Kotlin development team in designing and implementing a greenfield integration system tailored to meet the requirements of the new pension framework and drive the migration to a cloud-native architecture.

Solution:

  • Replaced the legacy on-premise Oracle system with a cloud-native solution hosted on Azure to support the new pension law implementation.
  • Designed and implemented a robust event-driven integration system from scratch, leveraging modern security measures, including mTLS connections, OAuth2, encryption, signing, and message-level authentication.
  • Integrated diverse systems, such as Salesforce, Festina, Unit4, Visma, ING, and other financial and government institutions, ensuring secure and compliant data exchange.
  • Implemented transformation and adaptation layers to handle data interchange between SOAP, REST, event-driven systems, and batch files in various formats, including legacy systems.
  • Leveraged Azure Blob Storage, Service Bus, Cosmos DB, and Functions to build a scalable, secure, and efficient architecture for pension data processing.

Impact:

  • Delivered a highly secure and scalable integration layer critical to the implementation of the New Pension Law.
  • Successfully replaced the on-premise Oracle system, modernizing the pension data processing infrastructure and aligning it with cloud-native best practices.
  • Enabled seamless data transformation and adaptation between systems, ensuring compliance with government-mandated pension reforms.
  • Achieved robust system reliability and scalability to handle growing business demands and regulatory requirements.

Automated Parcel Processing System

Employer: PostNL
Role: Senior Solution Software Engineer (Kotlin)
Dates: 2021–2022
Tech Stack: Kotlin, AWS Lambda, EventBridge, S3, DynamoDB, SNS, SQS, AWS AppSync, AWS CloudFront, AWS Location Services, AWS CDK, IoC

Problem: The organization required a modern, automated system to optimize parcel processing and resource allocation, leveraging data from IoT systems to improve efficiency in parcel delivery.

My Role: Worked on a greenfield project to design and implement an event-driven system that automated parcel processing and resource allocation using AWS serverless technologies and Kotlin.

Solution:

  • Designed and developed an event-driven architecture using AWS Lambda, EventBridge, SNS, SQS, and DynamoDB for efficient data processing and event handling.
  • Integrated data from IoT systems to monitor the movement, availability, and location of roll containers and other resources.
  • Leveraged AWS AppSync and AWS Location Services to enable real-time GraphQl API and geolocation visualisation.
  • Implemented resource allocation logic to automatically plan better and more efficient parcel delivery.
  • Built the infrastructure using AWS CDK with a focus on Infrastructure as Code (IoC) for maintainability and scalability.

Impact:

  • Delivered a highly efficient system for real-time resource allocation, ensuring swift and cost-effective parcel delivery.
  • Optimized the use of roll containers and trucks by automatically planning routes and resource allocation based on real-time data.
  • Improved operational efficiency and reduced resource waste through automated planning and tracking.

Customer Account Enhancements and Internationalization for E-Commerce

Employer: Bol.com
Role: Senior Software Engineer
Dates: 2019–2021
Tech Stack: Kotlin, Java, Spring Boot, Google Cloud Platform (GCP), Kubernetes, Google Cloud Datastore, BigQuery, GraphQL, REST

Problem: Bol.com needed new features for customer accounts to improve user experience and internationalization of both customer accounts and communication systems to enable expansion into Belgium.

My Role: Worked on enhancing the webshop’s customer accounts and internationalizing both customer accounts and communication systems for seamless operations across regions.

Solution:

  • Added new customer account features, such as invoice generation, debt tracking, order history, and real-time order status updates.
  • Improved existing features, ensuring a seamless and intuitive user experience.
  • Expanded internationalization capabilities for customer accounts and communication systems, such as email, to support multiple languages.
  • Ensured the secure handling of Personally Identifiable Information (PII) data throughout the system.
  • Utilized GCP technologies, including Google Cloud Datastore and BigQuery, for efficient data storage and querying.
  • Built scalable and maintainable services with Kubernetes, GraphQL, and REST APIs.

Impact:

  • Enhanced customer satisfaction by providing robust features like detailed order tracking and invoice access.
  • Successfully enabled Bol.com to expand into Belgium with localized customer account and communication systems.
  • Improved overall user experience, operational efficiency, and data security across regions.

Telecom Platform Order Chain and Delivery, Integration and Modernization

Employer: KPN
Role: Lead Software Engineer / Solution Designer
Dates: 2013–2019
Tech Stack: Java, Spring Boot, PostgreSQL, Oracle, Kubernetes

Problem: KPN required seamless integration of Telfort’s fiber and copper systems into its own, along with modernization of legacy billing systems to support new and existing customers.

My Role: Led and contributed to multiple projects, including:

  1. Integration of Telfort’s fiber and copper systems into KPN’s infrastructure to enable full support for Telfort customers and new order processing.
  2. Replacement of legacy Telfort/Tiscali billing systems with integration into KPN’s modern billing platform.

Solution:

  • Built and expanded core components to enable Telfort fiber and copper customers to be fully incorporated into KPN’s systems.
  • Developed and integrated systems to support the order chain for new customers, ensuring seamless onboarding processes.
  • Conducted a migration of existing customers into the new system, including enabling KPN to communicate migration stages effectively.
  • Integrated with KPN’s billing platform to replace outdated systems, ensuring accurate and efficient billing operations.

Impact:

  • Successfully enabled Telfort fiber and copper customers to transition seamlessly into KPN’s infrastructure with minimal service disruptions.
  • Delivered robust systems for new customer order processing, streamlining onboarding and operational workflows.
  • Modernized billing systems, improving reliability and efficiency for Telfort customers.
  • Enhanced scalability and reliability through modernized architecture, ensuring long-term support for increasing customer and data volumes.

Earlier Experience (2000–2013)

Senior Java Backend Developer, Various Roles

Focused on Java backend development, REST APIs, and enterprise integrations. Highlights include:

  • Building secure APIs for e-commerce platforms.
  • Designing backend systems for logistics and supply chain management.
  • Building provisioning systems for telecoms.
  • Building backend systems for airline.
  • Optimizing data exchange systems for the energy and utilities sector, contributing to efficient electricity and gas management

LinkedIn Recommendations

I have received positive feedback and recommendations from colleagues and clients for my work. You can view these on my LinkedIn profile.