Johann Simon Hoffmann

United States · Remote

Staff augmentation for US client teams with daily professional communication in English.

• Built end-to-end backend workflows for approximately 2 years with Java 17 and gRPC, integrating frontend code, feature flags, Hibernate, and a new microservice.
• Created and evolved stored procedures and proposed a reusable view to simplify data access.
• Independently migrated 4 to 5 modules from ExtJS to React in approximately 3 months.
• Analyzed and refactored workflows operating on structures with millions of nodes, identifying performance and maintainability risks.
• Implemented a serverless ETL migration with 3 AWS Lambda functions, S3, IAM, CloudWatch, and DynamoDB, plus a Ruby microservice integrated with AWS services.
• Maintained at least 90% unit test coverage and participated regularly in code reviews.

Coordinated a team of 3 developers while contributing to critical systems.

• Supported the Product Owner with prioritization, task allocation, code reviews, and delivery tracking.
• Mentored an apprentice developer in Ruby on Rails.
• Joined the on-call rotation, investigated incidents with Datadog, and performed root cause analysis.
• Fixed failures in jobs and integrations, including incidents involving SAP communication.

Developed factory control and agribusiness traceability systems, including a deployment across 27 factories.

• Developed software with Ruby on Rails, JavaScript, SQL, REST APIs, Active Record, and Sidekiq.
• Built and maintained asynchronous jobs and optimized queries, using raw SQL when appropriate.
• Worked directly with users and business teams and supported critical production systems.