Interim Lead Developer & Architect for a program to redesign an internal legacy application into a new microservice environment. I took over the first team just before go-live and am currently ramping up teams 2 and 3.

? Team 1: Accountable for technical quality and responsible for 7 developers (FE, BE, QA)

? Team 1: Reduced bugs in team 1 by 80% within 10 weeks

? Teams 2 and 3: Collaborating closely with line management, product managers and project managers for project- and program planning, staffing and requirements analysis

? Interviewing stakeholders (tech & business) for requirements analysis and designing the

target architecture

? Optimizing team-internal and -overarching processes for the new service oriented landscape

Technologies: Kotlin, Spring Boot, Spring Batch, REST APIs, TypeScript, JavaScript, Angular, Docker, Kubernetes, Azure, MySQL, GitHub Actions

Mostly enjoying time off, traveling and working on personal development, but also working on side projects that include:

• A prototype for a business idea (a smartphone app in the fashion industry)
• Created a business plan using methodologies like Lean Canvas, Design Thinking, market research, user interviews and competition analysis
• Led the design of the backend architecture & created a domain model
• Implemented batch jobs to import and update ~900,000 products daily from affiliate marketplaces, using Spring batch
• Implemented a backend API for the smartphone app to fetch products and manage user data, using Spring boot and AWS ECS with Fargate
• Experimenting with AI, chatGPT, building custom GPTs, learning about vector databases

I set up a cross-functional team of 7 members from scratch (2 FE, 3 BE, 1 UX, 1 PM). The objective was to develop and test a SaaS MVP incrementally with a strategic customer and roll it out to the entire customer base (150,000). This was achieved after one year. My tasks included:

• Accountable for technical quality and responsible for the developers in the team
• Participated in the early business discovery and UX-testing for new features with the Product Manager, UX Designer and customer(s)
• Led the technical solution design and requirements-analysis, -breakdown and -estimation
• Set-up and continuously improved the teams? coding guidelines, ways of working, processes
• Coached each team member through one-to-ones, code reviews, retrospectives which led to a team culture of ownership and trust
• Spearheaded initiatives as the first team in the company and consulted other teams about them (e.g. Scrum and business discovery process)
• Conducted technical interviews for hiring new candidates

Project: Re-design and migrate the company?s API integration platform (middleware for 13 applications) from on-prem to cloud (25 APIs, 40 million calls/month)

• Technical Lead for a team of 5 developers, driving the way of working, coding guidelines and unblocking developers in their daily work
• Led the technical solution design and requirements-analysis, -breakdown and -estimation
• Drove the development of a canonical domain model as foundation for new API designs which increased the re-usability by eliminating redundant code (no. of APIs from 25 to 16)
• Designed and developed cloud infrastructure (Terraform) and API core features (Java), as follows:
  • authorization concept for customer-facing APIs, using attribute based access control and OAuth best practices (Curity, Spring Security)
  • automated provisioning of self-signed root- and client-certificates (mTLS) to Azure services (APIM) and APIs using Azure KeyVault and Terraform
  • ?custom ?high-security network architecture for E.ON?s Azure API Management (Firewalls, VNETs, subnets, NSGs) - in collaboration with Microsoft experts

• Prototyped backend architecture in Azure with IoT Hub, PowerBi, Stream Analytics
• Consulted business product team about technical implications

• Evaluated Java frameworks that can be used in a microservice architecture (bachelor thesis) 
• Implemented the code blueprint for automatic API documentation (SpringFox swagger)

• Implemented the RESTful middleware APIs in plain Java servlets