Sebastian Hesse

Anonymous Customer, AWS Consultant

For an antivirus SaaS solution, I increased monitoring capabilities using CloudWatch Dashboards and added a new feature to perform a full scan on thousands of files on Jira and Confluence within just a few minutes.

• Increase visibility for users to see scan results within a CloudWatch Dashboard using special Logs Insights queries
• Leverage Step Functions to download 10.000+ files from Jira or Confluence and scan them for potential threats, all within just a few minutes

Utoolity GmbH, AWS Consultant

Leads the architecture and implementation of AWS integrations for the Atlassian Marketplace apps. Reduces technical debt to reclaim time to market.

• Created new AWS integrations to extend the app portfolio and revenue streams using a multi-product strategy
• Designed and executed a migration strategy to update 500+ CloudFormation stacks with breaking changes, ensuring data integrity and reduced maintenance periods

Decadia GmbH, Senior Software Engineer

Improved Azure API Management security and permission setup to reduce potential attack vectors in a new application. Similarly, reduced potential threats by following best practices for AWS security within the AWS organization.

Decadia GmbH, Senior Software Engineer

I supported a Scrum team of 6-8 people that's building a Serverless pension portal for a big energy corporation. It's a multi-tenant, event-driven system built on top of EventBridge, DynamoDB, S3 and AWS Lambda written in TypeScript.

• Took a leading role in designing and implementing a custom architecture for authentication and authorization on top of Cognito
• Implemented a crucial feature for verifying and processing documents provided by users

Utoolity GmbH, AWS Consultant

Supported a small software vendor by building a library to help discovering AWS resources. Besides using AWS SDKs, it also scraped AWS documentation and generated TypeScript code.

• Developed a library to discover AWS resources and make them available via API
• Migrated multiple services from AWS SDK v2 and JavaScript to AWS SDK v3 and TypeScript

PACE Aerospace, Serverless Consultant

I advised two teams developing software for aircraft pilots about Serverless best practices on AWS.

• Improved the existing multi-tenant architecture for deployment processes, costs, and maintainability
• Automated their AWS Organizations setup
• Knowledge transfer about several AWS services like DynamoDB, Step Functions, and CI/CD tooling as well as AWS CDK

Anonymous Customer, Senior Software Engineer

I supported a team of 8 people building a search engine as part of a bigger software product with several million visits per day. One of my main responsibilities was re-architecting the data ingestion systems and building a 100% serverless, event-based system using AWS Lambda, MSK, S3, DynamoDB, StepFunctions, SNS, SQS and EventBridge.

• Re-architected the data ingestion process using Amazon MSK
• Implemented several features to improve the search experience

ImmobilienScout24, Software Engineer

I supported a product team developing SSO (Single Sign-On) and user messenger related features. The software is hosted on AWS using EC2/ECS, RDS, SQS, AWS Lambda, DynamoDB, etc. and main programming languages include Java, JavaScript and TypeScript.

Kurviger.de - Motorrad-Routenplaner, Software Engineer

The existing JavaScript and jQuery code was migrated to components using the Mithril framework. Additional serverless functions using Google Cloud Functions and Firebase were developed to support payment processes.

saas-marketplaces.com, Software Engineer

Built a collection of SaaS marketplaces to discover new opportunities starting a business. I was responsible for the technical architecture using a serverless stack.

• Serverless REST API using AWS Lambda and API Gateway
• Automated CI/CD process using AWS CloudFormation and GitHub Actions
• REST API documentation using OpenAPI (Swagger)

K15t GmbH, Software Engineer

Developed new features and improving the existing code as well as the technical infrastructure on AWS.

• Automate synchronization between Jira systems using Serverless Functions
• Created a hybrid architecture using EC2 and AWS Lambda for high scalability and high throughput of data
• Improved infrastructure automation process by using AWS CloudFormation

K15t GmbH, Software Engineer

We migrated an existing on-premise application to a serverless cloud application. I was responsible for designing the target architecture and leading the migration while keeping systems running.

• Designed architecture using cloud technologies like DynamoDB, S3, AWS Lambda and also EC2
• Automated deployments using Bitbucket Pipelines and AWS CloudFormation

K15t GmbH, Software Engineer

My main responsibilities were developing new features, improving the existing code and writing automated tests.