Leo Hansen Ordóñez
Verified Expert in Engineering
Back-end Development Developer
A Coruña, Spain
Toptal member since August 4, 2020
Leo is a back-end developer with a focus on stable and reliable software in cloud environments. With firsthand experience in REST APIs, data processing, SQL, and CI/CD, Leo enjoys development and DevOps alike. He specializes in building secure platforms in a variety of languages and prides himself on being fast and reliable as well as good and clear communication.
Portfolio
Experience
- C# - 8 years
- Back-end Development - 6 years
- Web Development - 6 years
- Node.js - 4 years
- JavaScript - 4 years
- TypeScript - 4 years
- Go - 3 years
- Docker - 3 years
Availability
Preferred Environment
Email, Slack, JetBrains, Visual Studio Code (VS Code), Linux
The most amazing...
...product I've developed is a platform to buy and process digital vouchers to enable small businesses to sell vouchers online through a safe payment gateway.
Work Experience
CEO
bitpiraten GmbH
- Built a new software consulting company focused on delivering secure and fast software for clients.
- Built the company website by creating a handcrafted, static, self-contained site instead of a generic site-builder.
- Developed a calendar management software specialized for client's needs for them to be able to generate a daily schedule overview for their workers.
Senior Back-end Developer
RTechS GmbH
- Developed client-side image scaling for a customer's web portal to reduce data usage on mobile clients using the site.
- Implemented a milestone management system for visually-driven project management software that allows users and managers to easily identify pending milestones and issues behind their due date.
- Built the deployment infrastructure in Azure for cloud software with multiple IAC roles.
Student Developer
Pepperl+Fuchs GmbH
- Developed an app that monitors real-time bus traffic of an in-house process automation bus system. The traffic is captured by silently listening on a COM Port and the user is given visual feedback with a Wireshark-like interface to analyze traffic.
- Implemented automated testing for a 24 bit Delta-Sigma ADC embedded into a microcontroller through an external, programmable measurement instrument to evaluate its usage rather than an external chip.
- Built a media access control for a bus system that implements the bus protocol in coded hardware (VHDL) and does a two-way translation to Ethernet (IEEE 802).
Experience
Voucher Transaction Platform
The vouchers are sold online and the payment is handled through a payment service. The end customer gets a QR code representing their voucher via mail and online.
My part of the project was to build the backend. The code is written in Go with PostgreSQL and is hosted on GCP with automatic deployment through CI/CD.
Data Processing Platform
All moving parts are working independently of each other via a microservice-esque ETL pipeline.
Education
Master of Science Degree in Information Technology
Hochschule Mannheim - Mannheim, Germany
Bachelor of Engineering Degree in Electrical Engineering
DHBW Mannheim - Mannheim, Germany
Skills
Libraries/APIs
Node.js
Tools
JetBrains, Slack
Languages
TypeScript, Go, C#, JavaScript, Python, SQL, Embedded C, Rust, Haskell, C
Platforms
Linux, Google Cloud Platform (GCP), Docker, Amazon Web Services (AWS), Azure, Visual Studio Code (VS Code)
Storage
PostgreSQL
Frameworks
.NET, ASP.NET
Other
Web Development, Back-end Development, Cloud, Embedded Software, Networking, Security, Mobile Networks, Signal Analysis, Robotics, Servers, Email, Real-time Operating System (RTOS), Hardware Development, Software Development
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