Thorben Fohlmeister

Senior Freelance Full-Stack Developer

3 Projects with finance
Banking Interface (Payments and Transactions)

Cloud-Native API

Customer
Raisin Bank AG
Location
Frankfurt
Industry
Finance
Start
March 2024
Duration
10 Months
Position
Backend

Development of a cloud-native backend platform for payment processing and transaction monitoring in a B2B banking environment. The solution integrates various AWS services and external partner systems, enabling secure processing, transformation, and routing of payment data. Key focus areas included AML transaction monitoring, cash flow surveillance, and third-party integrations. The project also emphasized technical documentation and onboarding of new team members. Architectural consulting and technical leadership within the team. Establishment of code review processes and quality standards. Close collaboration with product owners and stakeholders in agile processes.

Tasks

  • Design and development of AWS Lambda functions
  • Integration of external systems and partner interfaces
  • Implementation of AML transaction monitoring
  • Data persistence with DynamoDB and Prisma
  • Creation and maintenance of API specifications (OpenAPI)
  • Contribution to architectural decisions and infrastructure automation
  • Onboarding and technical support for new developers
  • Maintenance of technical project documentation
  • Architectural consulting and technical decision-making
  • Code reviews and quality assurance
  • Stakeholder communication in agile processes
Banking Interface

Cloud-Native API

Customer
Raisin Bank AG
Location
Frankfurt
Industry
Finance
Start
September 2020
Duration
3 Years
Position
Backend

Design and development of a scalable cloud API for a B2B banking service provider. The solution covers the entire customer lifecycle and integrates the Mambu core banking system along with numerous external services (KYC, monitoring, payment gateways). The project included regular code reviews and onboarding of new team members. Technical leadership of a growing development team. Co-design of system architecture and scaling strategy. Establishment of development standards and automated quality assurance processes.

Tasks

  • Development of AWS Lambda functions
  • Integration of external systems and partner interfaces
  • Implementation of logging and monitoring solutions
  • Maintenance and extension of API specifications (OpenAPI)
  • Setup and maintenance of infrastructure with AWS CDK and Terraform
  • Conducting code reviews
  • Onboarding of new developers
  • Technical leadership and architectural decisions
  • Establishment of code review standards
  • Agile collaboration with product owners
Datalake Management Console

Web Application

Customer
Startup
Location
Berlin
Industry
Finance / FinTech
Start
March 2020
Duration
6 Months
Position
Fullstack

Development of a management console for controlling and monitoring data flows into a datalake for an AI FinTech company. The solution is based on a serverless AWS architecture and provides a real-time interface via GraphQL. Independent design of the entire serverless architecture on AWS from the ground up.

Tasks

  • Design and setup of AWS components
  • Implementation of the management console with React and Redux
  • Creation of GraphQL schemas and functions with AWS Amplify
  • Integration and testing of data sources (RSS, Twitter, web crawler)
  • Design of the serverless system architecture