Wessel van Lit

October 2024 - Present

Senior engineer ensuring the "ordered today, delivered tomorrow" promise is kept. Owning end-to-end customer journeys in TypeScript and C# systems.

Led a 6-month rewrite of the delivery proposition microservice from C# to TypeScript, shifting to pre-fetched caches and event-driven data. Improved latency (P95 250ms to 50ms, P99 500ms to 100ms) while scaling to millions of requests on a handful of ECS tasks and restoring team ownership.
Designed an event-driven product data aggregator that provides a unified read model across multiple sources, reducing integration effort and data inconsistencies for delivery applications.

August 2022 - October 2024

Built and maintained shipment infrastructure for 20,000+ daily shipments. Modernized legacy systems and shipped new C# microservices.

Designed and implemented a shipment event store on AWS (Lambda, SQS, SNS, DynamoDB), centralizing data for other domains and powering shipment status in the order overview.
Co-built a microservice that determines shipment insurance value with a Data Analyst, enabling ML-driven decisions by running ONNX models authored in Python within .NET.

May 2021 - August 2022

Consultant delivering logistics software across multiple client projects in manufacturing and port operations.

Led the migration of a Manufacturing Execution System (MES) front-end from Internet Explorer to Chrome and ES6 JavaScript to unblock modern development and browser support.
Built workflow tools for factory employees using TypeScript and React to streamline daily work and reduce manual steps.

Improved developer tools (Java + Spring Boot + Angular) for validating systems after updates and catching regressions early.
Built an Azure CI/CD pipeline with Packer, Terraform, and Python to make testing older system versions easy and repeatable.

August 2020 - February 2021

Graduation internship focused on bringing CI/CD to embedded and IoT devices.

Wrote a thesis on integrating CI/CD pipelines into embedded devices and built a working prototype to prove feasibility.
Explored scalable Over-the-Air updates for ESP8266 microcontrollers using Azure CI/CD with C++ and Python, validating the approach in practice.

March 2020 - August 2020

Applied R&D role improving warehouse picking operations with hardware and software prototypes.

Researched the use of light (lamps and LED strips) to speed up warehouse picking flows.
Created C# software to control a DMX spotlight, highlighting products for pickers.
Developed a C# UWP app for Raspberry Pi to communicate with Teensy microcontrollers over RabbitMQ.
Programmed Teensy microcontrollers in C++ to assign picking shelves via LED strips.

February 2019 - February 2020

Data analyst turned technical product owner, leading 2 remote developers while maintaining credit check reliability and speed.

Analyzed data with Tableau and SQL to uncover bugs and improve operational and technical performance.
Built an asynchronous Go microservice with a custom rules engine to replace the old credit check and improve reliability.

August 2018 - August 2019

Supported CS teachers and first-year students with programming and math tutoring.