Python Django Developer – Contractor

Brief: Update legacy Docker Containers in a monolith Django application with the latest security-patched Python and Debian packages. The project was mainly a Python web backend using Django and Django Rest Framework as a RESTful API, PostgreSQL as a backend database, and Redis as the in-memory cache. The application also used GRPC with protocol buffers for data serialization. The project was containerized Docker in a Debian Linux container. Docker-compose was used for local multi-container management. Application logs were streamed to an Elasticsearch Container for analysis by Apache Kafka. Order transactions and tasks were queued using RabbitMQ. CI/CD was orchestrated using Jenkins. Finally, the project was managed using Agile.

The project had five environments: Production, Staging, Sandbox, Testing, and Local. The local environment was for initial testing of the updated Python packages. Once initial testing for a package was completed, pushing the code into GitHub would trigger the test environment to spin up and run in Jenkins. Additional testing could be done in the cloud using the Sandbox or Staging environments. Sandbox environments were similar to the local environment and consisted of 11 docker containers. However, sandbox data was closer to actual production data. The staging environment was a closer replica of the production environment with ~50 containers and used the same data as the sandbox environment. Production, staging, and sandbox environments used Amazon Elastic Container Service (Amazon ECS) for container orchestration. Testing and local environments used docker-compose for container management.

Led a 3-person team with fellow Python developers, Linux sysadmin, and DevOps engineer.
Created a Python, bash, and docker project that reads Python requirement files creates the necessary file changes within the client Django sites and pushes the changes into a Jenkins CI server.
We used the results to help us understand how much work needed to be done, which allowed us to prioritize and group Python packages for updates.
Updated existing code to be compatible with the latest versions of ~400 Python packages.
Tested and updated REST API endpoints.
Wrote Groovy/Java code for Jenkins CI/CD pipelines.
Followed Test Driven Development principles.
Updated client test cases for new package versions.
Updated client documentation to match new package versions.
Mapped the package's old API to the respective package's new API.
Python and shell scripting for automating processes where appropriate.
Created docker-compose files to create environments to run package tests automatically for various packages.
Worked with Amazon Elastic Container Registry (Amazon ECR) to push and pull client containers.
Removed dead code and unneeded additional packages.
Maintained JIRA board.
Documented client code