Kristof Leroux
Verified Expert in Engineering
Blockchain Developer
Genk, Belgium
Toptal member since November 10, 2022
Kristof is a professional developer with almost 20 years of experience in the IT industry. He specializes in developing iOS and Android mobile apps with C, C++, C#, .NET, Ionic, TypeScript, Ruby on Rails, and Python. His expertise also includes data, machine learning, and blockchain development with Solidity on Ethereum and Tezos. Kristof launched and sold two startups, one for hosting and the other for social media management.
Portfolio
Experience
- Linux - 20 years
- Software Engineering - 17 years
- Algorithms - 17 years
- Data Structures - 17 years
- SQL - 17 years
- Software Development - 17 years
- MacOS - 16 years
- Python 3 - 5 years
Preferred Environment
MacOS, Linux, Python 3, Python 2, C, Solidity, JavaScript, React, Amazon Web Services (AWS), SQL, Blockchain, Smart Contracts, Ethereum, Bots, Blockchain Platforms, Cryptocurrency, Non-fungible Tokens (NFT), CTO
The most amazing...
...thing I've launched is a startup in 2012, winning the first edition of Startupbootcamp Amsterdam.
Work Experience
Freelance Senior Python Engineer
ENGIE Impact
- Developed and maintained the power feature team's applications, such as Hedgie, AssetRep, and Opnl, used by traders to hedge risk using futures contracts.
- Delivered many solutions using tools such as Python, Flask, pytest, Postgres, TimescaleDB, Kinesis, Vue, GitHub, Drone CI, Azure, AWS, Grafana, Kibana, Elasticsearch, Sentry, Kubernetes, Docker, and Jira.
- Developed and maintained apps of a renewable energy services team, including Mon Pilotage Elec (MPE), Tegami, and GEPO, to monitor and control the electrical grid's stability with activation or curtailment if needed.
Freelance Senior Python Engineer
InvestSuite
- Contributed to various automated investment solutions for a European fintech company helping financial institutions retain their clients by defending their market positions against nimble B2C fintech disruptors.
- Developed and maintained back-end services with Console API, Entity, Storyteller, Elasticsearch, and Interactive Brokers integration. These services were part of the robo-advisor and asset management platform.
- Used different tools and technologies, including Python, FastAPI, pydantic, pytest, Cosmos DB, MongoDB, Kafka, gRPC, GitLab CI/CD, AWS, Kubernetes, Docker, Helm, Istio, Jira, Miro, and many more.
Senior Back-end Developer
TiiQu
- Worked for TiiQu, a blockchain-based platform that uses immutable, verifiable blockchains to create digital "passports," i.e., helps to prove identity, previous work experience, qualifications, performance metrics, and so on.
- Started when they were bootstrapping and helped with the architecture, DevOps, the CI/CD pipeline, smart contract development, and security proofing.
- Wrote technical white papers and other documents.
Experience
Automata Studio
SocialExpress
We participated at Startupbootcamp Amsterdam and became one of the ten finalists. In two years, we raised almost one million euros and had a lot of media coverage.
I was the CTO and developed the back end in Python with Flask. We used Machine Learning techniques like advanced sentiment analysis and topic modeling with Latent Dirichlet Allocation. I managed a team of five developers.
Education
Master's Degree in Artificial Intelligence
Maastricht University - Maastricht, The Netherlands
Bachelor's Degree in Computer Science
Hasselt University - Diepenbeek and Hasselt, Belgium
Certifications
Executive Program in Algorithmic Trading (EPAT)
QuantInsti
Skills
Libraries/APIs
PostgREST, NumPy, Pandas, Web3.js, Node.js, React, Vue, TensorFlow, PyTorch, Keras, Pydantic, Protobuf, Interactive Brokers API
Tools
Pytest, GitHub, Slack, MATLAB, Grafana, Kibana, Sentry, Jira, Kafka Streams, GitLab CI/CD, Helm, Istio, Miro, Gorilla
Languages
Python 3, Python 2, C, Solidity, SQL, Rust, JavaScript, Go
Platforms
MacOS, Linux, Blockchain, Amazon Web Services (AWS), Software Design Patterns, Docker, Ethereum, Blockchain Platforms, Apache Kafka, Azure, Kubernetes, Databricks
Frameworks
Flask, Apache Spark, gRPC, Gorm, Django, Bootstrap, Knockout (Knockout.js), AngularJS
Paradigms
Microservices, Management
Storage
Elasticsearch, PostgreSQL, Databases, Azure Cosmos DB, MongoDB
Other
Cryptocurrency, Software Development, Algorithms, Data Structures, Matrix Algebra, Software Engineering, Machine Learning, Neural Networks, Artificial Intelligence (AI), Smart Contracts, Bots, Fintech, Non-fungible Tokens (NFT), CTO, Algebra, Calculus, Informatics, Artificial General Intelligence (AGI), Philosophy, TimescaleDB, Amazon Kinesis, CI/CD Pipelines, Teams, Delta Lake, MLflow, FastAPI, Quantitative Finance, Backtesting Trading Strategies, Finance APIs, Markets, Risk, Models, Time Series Analysis, Ethereum Smart Contracts, Flask-Admin, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT)
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