Erwin is available for hire
Hire ErwinErwin Feser
Verified Expert in Engineering
Strawberry Developer
Location
Oviedo, Spain
Toptal Member Since
July 16, 2012
Erwin has over a decade of experience programming in languages—primarily Python, but with experience in C and Java. He has developed major projects from scratch, helped define business logic beyond the technical sphere, and prides himself on flexibility, adaptability, and proactivity. Erwin keeps scalable architecture at the forefront and constantly works to improve and train new skills.
Portfolio
TLR Ventures
Python, Django, GraphQL, Docker, PostgreSQL, Auth0, Strawberry
Arbo
Shapely, Sentry, Wagtail CMS, GitHub Actions, Django REST Framework, GeoJSON...
ConsumerAffairs
Django REST Framework, Django, Python
Experience
Availability
Part-time
Preferred Environment
Serverless, AWS Lambda, Zappa, Django, Python, Docker
The most amazing...
...sites I've worked on are the back ends for goarbo.com, nationalgeographic.com, preferhired.com, and vium.com.
Work Experience
Technical Leader
2019 - PRESENT
TLR Ventures
- Designed and implemented GraphQL and Rest APIs. Also designed subscriptions for a better user experience using the main application.
- Architected security, permissions, and roles layer implemented with Auth0.
- Performed schema design and performance tweaks. Did asynchronous processing using Kafka.
Technologies: Python, Django, GraphQL, Docker, PostgreSQL, Auth0, Strawberry
Technical Leader
2019 - 2022
Arbo
- Developed the back end for an app like Kayak for crude oil and derivatives. For instance, clients calculate the best paths for moving crude oil from one station to another, considering tariffs, distance, availability, and more.
- Implemented and customized a content management system (CMS) with Wagtail on AWS Lambda using Zappa.
- Set up CI/CD for both projects using GitHub Actions, similar to CircleCI.
Technologies: Shapely, Sentry, Wagtail CMS, GitHub Actions, Django REST Framework, GeoJSON, PostGIS, Zappa, AWS Lambda, NetworkX, Django, Python
Senior Django Developer
2018 - 2019
ConsumerAffairs
- Fixed many bugs in a complex and very old Django app ecosystem.
- Covered all my source code (100%) by unit tests validated by colleagues.
- Added new features and background notifications by tweaking Django templates.
Technologies: Django REST Framework, Django, Python
Python/Django Developer
2015 - 2018
Vium
- Implemented the complex and flexible authentication and permission structure required by this project.
- Wrote unit tests for endpoints and customized admin pages.
- Created wizards and complex customizations in the admin site.
- Improved performance by using background tasks with Celery.
- Created and improved many endpoints performance by tweaking Django ORM queries.
Technologies: Docker, PostgreSQL, KairosDB, Django REST Framework, Django, Python
Technical Leader
2014 - 2016
Bytelion
- Programmed complex background tasks using Celery and did the entire back end for a new social network.
- Implemented MongoDB using Django as a parallel DB.
- Built a complex and secure API and configured Heroku environments.
- Configured a bid data external processor cluster and implemented periodic tasks.
- Wrote a push notifications library and its administration site.
Technologies: R, PostgreSQL, Push Notifications, Freebase API, MongoEngine, MongoDB, Heroku, Celery, Tastypie, Django, Python
Technical Leader
2013 - 2014
Globant
- Created the main portal for National Geographic.
- Implemented a photo library.
- Facilitated the publishing process for photos.
- Built a reversion feature for all edited objects.
- Made a reusable CMS for the YourShot project (also for NatGeo).
Technologies: Elasticsearch, Tastypie, Django, Python
Python Developer
2011 - 2013
Santex America
- Wrote a primitive format to MS Word (docx) and MS Word to a primitive format transcoder in Java for Webfilings.
- Built a server account administration system in Python using Django. It runs in the browser.
- Programmed a document library manager in Python using WebApp2 that runs over Google App Engine.
- Created the project and branch manager in Python using Django Nonrel (NoSQL) and JavaScript.
Technologies: NoSQL, Google App Engine, webapp2, Django, Python, Java
Developer
2010 - 2011
Devar S. A.
- Wrote an equivalence course-management web application in Java for SXXI University.
- Developed an institutional website in Python (Django) for Devartec.
- Built an institutional website in Python (Django) for the Cidesca Foundation.
Technologies: Java, Django, Python
Operator
2009 - 2009
E-NIX S.R.L.
- Administrated and remotely supported the Linux Server, including firewalls, proxies, web, and mail servers.
- Installed and configured remote monitoring and administrative tools, including Nagios, Webmin, and Gosa.
- Developed a plugin for Nagios.
Technologies: Plugin Development, Webmin, Nagios, Linux Servers
Developer
2007 - 2008
Vates S.A.
- Developed alarm-monitoring modules in C/C++ with TeMIP framework.
- Implemented automatic report generation of service quality using XML, Java, and SQL.
- Administrated the Unix server.
Technologies: Unix, SQL, Java, XML, HP TeMIP, C++, C
Experience
Vium (Mousera)
http://www.vium.com/Django project with a complex API built with Django REST Framework. Lots of admin site customizations.
Datastores: Postgres and KairosDB
Datastores: Postgres and KairosDB
Preferhired
Entire back-end (API design, background services, unit tests, documentation, implementation, PayPal integration) built from scratch using Python 3, Django, DRF, and Celery (running on Heroku).
Samegrain
New social network. Back-end implemented with Django and running on Heroku.
Related technologies: Celery, MongoDB, RabbitMQ, Django Rest Framework, Tastypie, PubNub
Related technologies: Celery, MongoDB, RabbitMQ, Django Rest Framework, Tastypie, PubNub
NatGeo Homepage
Complete back-end development using Django framework.
Equity App for Fundedbyme
Social investment for startups. Back-end implemented with Django framework.
Academic-level Programming
GNU/Linux kernel modules development (basic drivers). Simple file system implementation (FUSE).
Debugging and testing tools: GDB, Valgrind, Check, Trace.
Cooperative development tools: SVN.
Debugging and testing tools: GDB, Valgrind, Check, Trace.
Cooperative development tools: SVN.
Arbo
http://www.goarbo.comA kind of kayak for oil and gas pipelines in the US. I build the back end using Django, DRF, NetworkX, Zappa, Lambda, and Postgres.
It uses an algorithm based on Dijkstra to find the best path from one oil station to another.
It uses an algorithm based on Dijkstra to find the best path from one oil station to another.
Skills
Languages
Python, XML, SQL, Java, C, C++, R, Python 3, GraphQL
Frameworks
Django REST Framework, Django, GeoDjango, webapp2
Tools
Celery, RabbitMQ, GitHub, Nagios, Webmin, Sentry, Jenkins, Amazon CloudFront CDN, Graphene, PyCharm, Jira, Docker Compose, Auth0
Platforms
Heroku, Linux, Amazon EC2, Google App Engine, AWS Lambda, Unix, Docker
Other
APIs, OpenDocument, Push Notifications, Strawberry, Linux Servers, Plugin Development, HP TeMIP, GeoJSON, GitHub Actions, BrainTree, Amazon Route 53, Wagtail CMS, Serverless, Graphs, Computer Science
Libraries/APIs
PubNub, Django-autocomplete-light, NetworkX, Shapely, Tastypie, Freebase API, PayPal API, Apiary API, Google Places API, Zappa
Paradigms
Agile Software Development, Agile
Storage
Elasticsearch, Amazon S3 (AWS S3), PostgreSQL, MongoEngine, NoSQL, KairosDB, MongoDB, PostGIS, BigTable
Education
2004 - 2011
Student Degree in Computer Science
Universidad Nacional de Cordoba, FaMAF - Cordoba, Argentina
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