Hi, my name is

Lionel Bersée

Full Stack Software Developer

I'm a software developer with extensive experience in the finance, cryptocurrency and gambling domains.

My passion is creating scalable, well-tested and intuitive software.

01. About Me

My experience spans across backend, frontend, infrastructure and data science. I have worked on ERP systems processing billions in revenue each year. Later in my career I pivoted to data science, developing a data processing pipeline capable of gathering, analysing and matching over 50,000 betting markets every 5 minutes. I also have a deep knowledge of blockchain and the DeFi ecosystem, stemming from my experience as a foundational engineer at iYield, crypto's first financial planning tool.

I value well-tested, intuitive and scalable software, and have proven experience taking software from design all the way to production and beyond.

Me

02. Where I've Worked

Senior Software Engineer iYield
April 2022 - October 2025
-Founding engineer responsible for delivering the foundational MVP.
-Led projects to integrate support for over 25 DeFi protocols and products.
-Solved scalability issues by architecting a solution leveraging websockets.
Software Engineer BitOdds
July 2020 - August 2021
-Led a significant refactor that reduced large dataset matching times by 40%.
-Integrated a system capable of generating analytics on sports specific overrounds.
-Improved system reliability resulting in the application's longest ever period with no downtime.
Software Engineer reecetech
Feburary 2019 - June 2020
-Led a project to create a web application allowing suppliers to update product data by themselves.
-Won the hackathon by creating a product enabling entirely contactless click & collect customer pickups.
-Represented reecetech at Australia's largest Python conference, PyCon AU.

03. Skills & Technologies

I'm learning new skills and technologies regularly. Shown below are some I've been using in recent projects:

Frontend Engineering
React
Next.js
TypeScript
component systems
Backend & APIs
Node.js
Python
GraphQL
REST
data modelling
Infrastructure & Reliability
AWS
Docker
Kubernetes
CI/CD
monitoring
Data & Observability
SQL
NoSQL
Jupyter
Pandas
Grafana
Sentry

04. What's Next?

Get in touch

Whether you have a question or just want to say hi, feel free to reach out!

Drop me an email and let's talk.