Chesco is available for hire
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Verified Expert in Engineering
Back-end Developer
Benicarló, Spain
Toptal member since March 23, 2017
Bio
Chesco's been a Python and Django programmer for four years and Java and Android for more than two. He also excels at SQL, NoSQL, HTML, and CSS. He enjoys building REST APIs and using Memcached, Ansible, Git, and AWS. He's built several APIs and designed and optimized SQL and MongoDB databases. Scalability is also one of his priorities when bootstrapping a project. Chesco worked as a tech lead in several of his projects and he enjoys facing new challenges.
Portfolio
Homewings Ltd.
Ansible, Django, Python, Scrum
MEF International Consulting
JavaScript, Django, Python
Elements Interactive
Amazon Web Services (AWS), JavaScript, RabbitMQ, MariaDB, MySQL, PostgreSQL...
Experience
Availability
Part-time
Preferred Environment
PyCharm, Python
The most amazing...
...thing I've coded was an automated video uploading, transcoding, and streaming delivery API together with Amazon Web Services.
Work Experience
Back-End Engineer
2017 - PRESENT
Homewings Ltd.
- Built full-stack features (back- and front-end) involving moderately simple front-end tasks, and more difficult back-end architecture tasks from database design to API.
- Increased the back-end coverage and test quality—achieving 93% coverage—and increasing the test cases for already covered code, finding and fixing small bugs before they actually happened.
- Increased the organization of the development team, by partially applying Scrum techniques and acting as Scrum Master. The team size was not large enough for a full-fledged Scrum implementation so far; also added new tools for syncing business with the development team.
- Upgraded the Ansible implementation and deployments of the platform, making it more robust; added Celery deployments and implemented Ansible best practices for security.
Technologies: Ansible, Django, Python, Scrum
CTO
2014 - PRESENT
MEF International Consulting
- Created a web platform with both public and private sites.
- Managed customers, leads, and products.
- Optimized SEO and implemented OGP.
- Worked on continuous integration and deployment with Jenkins.
- Coordinated a team of one designer, front-end developers, and one back-end developer to achieve the delivery of the product.
Technologies: JavaScript, Django, Python
Senior Back-End Developer
2015 - 2017
Elements Interactive
- Built an automated video transcoder platform with AWS into a streaming service. Users would upload content and it would become automatically available as streaming videos for the rest of the users using a CDN and transcoded to multiple devices.
- Developed multiple APIs in Python supporting high throughput, RESTful interfaces, caching mechanisms, and with developer friendly documentation.
- Created an IoT platform from scratch—including DevOps side (auto-scaling with AWS, deployments in Ansible, permissions, security), MQTT brokers with RabbitMQ and high availability clustering, an API for mobile devices to feed from the information of the devices, bidirectional communication, very high coverage and code quality monitoring, asynchronous tasks to monitor the status of the platform, and an admin site for managing the database and the machines with a permissions system.
- Built from scratch the back-end of a website using Wagtail CMS with fully editable and dynamic content.
- Stress-tested APIs.
- Implemented code profiling and bottleneck identification.
- Optimized the database, detected bottlenecks, and increased index efficiency.
Technologies: Amazon Web Services (AWS), JavaScript, RabbitMQ, MariaDB, MySQL, PostgreSQL, Ansible, Python, Django
Back-End Developer
2013 - 2015
Infantium S.L.
- Analyzed and developed a Python+Django platform—including public website and customers' dashboard.
- Constructed a REST API with a Tastypie optimization.
- Acted as an Android area supervisor also creating an SDK to be used by external developers.
- Created message queues and asynchronous tasks with Celery.
- Implemented cache management for scalability purposes with Memcached.
- Analyzed, created, and optimized SQL databases (with South) and MongoDB, in Linux.
- Collaborated with the front-end development with HTML+CSS3, Twitter Bootstrap, jQuery, JavaScript, HighCharts, and Google Charts.
Technologies: Java, Android, Memcached, MongoDB, MariaDB, MySQL, Django, Python 3, Python 2
Project Leader in an Android Development Project
2011 - 2012
Walkbase
- Developed two Android apps for an indoor positioning project in shopping malls together with the company Walkbase Inc.
- Developed a Java-coded server, 3-tier architecture (presentation, business, and data).
- Completed the life cycle of the project, presentations, and documentation.
- Acted as the team leader of a multi-disciplinary team of 5 members (including developers, designers and financial analysts).
- Earned an honorific mention at the ICT showroom.
Technologies: UML, Subversion (SVN), Eclipse, MySQL, Android, Java
Team Leader in Software Development
2009 - 2010
Universitat Politecnica de Valencia
- Implemented a multi-agent system (MAS) towards the exchange of water resources by intelligent agents in Java and Prolog.
- Completed the life cycle of the project.
- Installed, created, and managed SQL databases.
- Analyzed the whole project using UML diagrams.
- Supevised a team of two developers.
Technologies: TeX, UML, Subversion (SVN), Eclipse, MySQL, Java Agent DEvelopment (JADE), Java
Experience
MiniBrew Platform
https://www.elements.nl/portfolio/minibrew/Developed a full back-end and system architecture. It has data models, API, MQTT brokers, and communication and automatic deployments. The website with CMS for the moderators. 1+ year project so far and still growing.
Golden Visa Project
This is the website with public and private sites. Managed users, customers, and leads. It has Ansible deployments and continuous deployment and integration with Jenkins.
4JIM Platform
https://www.elements.nl/portfolio/4jim-app/Built the platform with user generated content at its center, using AWS and CDN to upload, process, and distribute the content. The back-end is in Python and Django, a MySQL database, an admin site for moderation of content, and high availability.
IoT Back-Ends Talk at EuroPython 2016 Conference
https://www.youtube.com/watch?v=2rgfO3xa9D0I was a speaker at the EuroPython conference during 2016 summer at Bilbao, Spain. There were around 200 assistants. The talk consisted on how to build an IoT back-end using Python, MQTT, RabbitMQ, Protobufs, and some other technologies.
Commit at Django Master
https://github.com/django/django/pull/6710A small but first merge request accepted at Django core. Worked with a couple Django core developers during the PyCon US 2016 at Portland, OR. It was a great experience!
Infantium Cognitive Platform
This is the first version of a cognitive platform to analyze the evolution of children learning with new technologies. Python and Django project, systems administration, and Python data analysis. I was also involved in Android programming.
Katja's Bodyscan
https://www.elements.nl/portfolio/katjas-bodyscan/A Django website with nation-wide stats and thousands of users completing forms about questions from the TV program.
Shoot2Share
https://www.elements.nl/portfolio/shoot2share/A video upload platform with AWS infrastructure, and a Python and Django back-end.
Education
2017 - 2017
Scrum Master Course Certificate in Agile Software Development
Scrum.org - Barcelona, Spain
2005 - 2012
Master's Degree in Computer Engineering
Universitat Politecnica de Valencia - Valencia, Spain
Certifications
JUNE 2017 - PRESENT
Professional Scrum Master
Scrum.org
Skills
Libraries/APIs
Django ORM, AMQP, jQuery, React
Tools
MQTT, Git, RabbitMQ, Celery, PyCharm, Ansible, Subversion (SVN), Vim Text Editor, Jenkins
Languages
Python, Python 3, UML, TeX, Python 2, JavaScript, C++, C, Java
Frameworks
Django REST Framework, Django, .NET, Java Agent DEvelopment (JADE)
Paradigms
Scrum, Agile Software Development, REST, Design Patterns
Platforms
Linux, Amazon EC2, Ubuntu, Android, Eclipse, Amazon Web Services (AWS), Unix
Storage
Amazon S3 (AWS S3), MySQL/MariaDB, PostgreSQL, MySQL, MariaDB, MongoDB, Memcached, SQLite
Other
APIs, Back-end, Python Performance, Amazon Route 53, IoT Protocols, Wagtail CMS, Operating Systems, GitFlow, Internet of Things (IoT), Ajax
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