Sven Hohlfeld
Full-Stack Developer
Erfahrungen
Full-Stack Developer - CPIL App & Config Team
Bayer AG
Support in the stabilization of the product and service landscape of the platform team in the context of approx. 100 Github repositories with approx. 4,000,000 lines of code.
Development activities:
- Creation of data migration for event sourcing, adaptation and standardization of bilingual libraries (python, go)
- Participation in ADRs
- Planning and supporting the transfer of repository responsibilities to other teams
Full-Stack Developer - SD/UI
Techem AG
Further development of the back office management tool for the administration of services for property-related charging stations & charging station networks.
Development activity:
- Implementation of requirements in Spring-Boot backend and React frontend. Deployment as Azure-Function Bundle in Azure
- Support of the POs in sharpening requirements, stabilization of the agile grown frontend
J2EE Developer - CPC
NordLB
Further development and maintenance of an approx. 20 year old, mature application for the risk-adjusted interest calculation of large loans. In addition to general development activities, I created an analysis tool that searches the Git history for keywords in order to create configuration files, which in turn had an influence on the QA process.
Parental leave/Sabbatical
Full-Stack Developer - CPIL Master Data Management
Bayer AG
Support in migration planning for the rewritten Masterdata 2 API platform supporting taxonomies and planning for the shutdown of Masterdata.
PoC for Lambda based Azure Cloud AD SAML Auth integration in AWS Lambda Authorizer.
Support in stabilizing the backend (Go/Golang programming language): fixing bugs, changing the GraphQL API
Architecture/Refactoring: I helped complete the extraction of larger software parts into separate modules due to organizational changes.
Coaching: I helped the international team with their testing skills and demonstrated how unit tests can also be introduced in Legacy Code.
Support of the product owner in shifting/transforming the existing business value into a new product vision: architecture, data sources, tech stack.
Architecture support: I started & ran several POC/investigation tickets that led to architectural decision records (ADRs). For example: alternative database types, low-code tools.
Backend: I created a prototype to import (semi-)publicly available hierarchical data (taxonomies) into a new database via various APIs and synchronize it with already available data.
Frontend: After all frontend developers (React) left the project, I helped with debugging and providing new features.
Full-Stack Developer/Technical Product-Owner/Domain-Specialist
unimed Abrechnungsservice für Kliniken und Chefärzte GmbH
Focus: The first module was completed on time and on budget under increased time pressure.
Team performance: I helped introduce Gitlab CI/CD instead of AWS Code Commit in the team.
Architecture: I have emphatically supported and promoted the switch to containers instead of pure AWS services (such as Lambda).
Leading: I took a leading role in the AFM team both as a developer and as a technical product owner. Ticket requirements, requirements engineering, support PO with requirements, moderation of review and planning meetings.
Implementation: I took responsibility for the process design and implementation for API-based, paper- and scan-based processes with the result that up to 300,000 pages a day or 5,000,000 pages per month could be processed 'on premise' (from zero to production).
Focus: I helped the team to push ahead with the elimination of technical debt during several sprints.
Implementation of different lambdas.
Implementation of various React components.
Coaching: Junit-Tests/Dependency-Injection/EBI.
Coaching: Workshop "Introduction to Requirements Engineering".
Focus: Establishment of code reviews.
Business details: Data model corrections & adjustments, as well as transformation of the so-called status concept.
Process: Standardization of ticket descriptions.
Leading: Restructuring of the agile development process.
Leading: Introduction of DB Migrations.
Leading: Stabilization of the customer API (Restful & HL7).
Founder
CHCKR
Development of a solution for guest registration in restaurants and pubs. Through a very simple digital recording of visitor data by scanning a QR code via smartphone, it is possible to trace reported guests including their notification in the event of a corona case. The entire system is realized as a Progressive Web App and therefore does not require installation from an app store.
Full-Stack Developer - Target2
Finanzinformatik GmbH & Co. KG
I presented agile working methods (team of 80+ people) and implemented them in my area
I have introduced automated tests and implemented the necessary adjustments in the existing code.
I have clarified unclear requirements and transferred them to the relevant documents for the technically responsible persons.
I have implemented prototypical implementations of the new Swift messages so that the old messages are compatible with the new ones.
Extensive refactoring of "copy and paste driven application development" within a very old framework towards - suitable architectural patterns - in compliance with the underlying framework: introduction of EBI at the process boundary (hexagonal architectural idiom) and thus achievement of testability and architectural structure in the first place.
Introduction of automated test cases and massive increase in test coverage.
Introduction of an orderly procedure to derive technical specifications from the so-called technical concept into a ticket-based backlog (Jira).
Coordination of the introduction of the aforementioned procedure as well as team meetings/workshop - do the persuasion work.
Coordination of the content structure of the tickets.
Introduction of backlog maintenance and ticket meetings.
Technical implementation/implementation of the technical concept (development/realization), where possible.
Defining test cases in cooperation with the people responsible.
Full-Stack Developer - structured financing
finpair.de
Continuation of full stack development (see preliminary project "Developer/Startup Consultant").
Founder
monkeycash.io
Prototype - mobile payment system for small and very small money transactions.
Development of a first prototype for a mobile payment system based on QR codes.
The background idea was processing payments over small amounts at low frequency at high speed. The entire system is realized as a Progressive WebApp and therefore does not require installation from an app store.
Full Stack Developer/Startup Consultant
Nord/LB
Planning and design of the process to be digitized with stakeholders of the analog process.
Implementation of the MVP with jboss wildfly-swarm and Angular NG (4+).
Support, planning and reinforcement of the spin-off as an independent (subsidiary) company.
Mediation and coordination of third party deliverables (design artefacts, HTML implementation).
Integration of third-party systems/interfaces/APIs such as hubspot, mailgun and idnow.
Developer at NEO/Onlinebanking Processes
Finanzinformatik GmbH & Co. KG
Implementation of the customer banking process to manage online banking with Javascript and Java. Use of eclipse and Webstorm and use of the OSPlus Neo Framework. Programming with the help of central components, services and services.
- Central printing services and DynS-based HOST interfaces
- Banking. Banking. Concrete implementation of technical processes:
- Edit Online Banking (customer online/stationary)
- Create online banking contracts (customer online/stationary)
- Manage Exemptions/NV Certificates (customer online/stationary)
- DWP depot opening
- Investment configurator
- Workflow design
Lead Developer/Senior Developer
Federal Authority (Customs ITZBund)
Connection of two federal authorities (Customs and Employment Agency) via soap-based interface designed after business requirements.
Reimplementation of existing specialist applications with an extended range of functions and newer technical solutions, partly by means of reverse engineering. Implementation a HTML5 web interface using a lightweight JSF variant.
- Inter-federal-authority communication
- Software design
- Implementation of SOAP web service interfaces
- Build management
- Release management
- Implementation of a lightweight JSF variant
- Implementation of a Java library for the technical encapsulation of the federal-authority interface
- Infrastructure planning and coordination of multi-level deployment
- Coordination of firewall configuration
- Test support
- Implementation of automatic click tests
- UI guidelines coordination
- Estimation of project effort
- Preparation for project planning
- Requirements management - risk management
- Requirements management - estimation and planning
- Project support in the field of infrastructure: networks, Websphere systems, interfaces
- Introduction of devops procedures (checklists, open task lists) between production and development
- HTML frontend
Interim IT Manager Business Development
connox.de
Planning, control and product development of the IT department.
- Introduction of agile processes
- Introduction of agile project management
- Introduction of agile project planning
- Product development B2B pricing tool (market price observing) as a "tag team"
- Support with annual IT project planning
- Planning and preparation of outsourcing of IT projects (Nearshoring)
- Outsourcing of partial functions to external service providers (newsletter)
- Support of the management in recruiting/personnel planning
- Preparation for the introduction of structured requirements management
- Introduction of the mobile sales channel for IOS and Android (app launch)
- Technical lead and process coordination for internationalization (EU/non-EU, DHL, customs, forwarding) project
- Coordination of IT requirements
Lead-Developer/Senior Developer
Customs ITZBund
Connection of second federal authorities (customs and DRV) via a professional,Soap-based interface in the federal network: DOI.
Implementation in comprehensive Websphere cluster environment with application server, Webseal, Oracle database, Rational Application Developer as well as Rational Doors as requirements tool.
- Inter-federal authority communication
- Software design
- Definition of SOAP web service interfaces
- Definition of security standards
- Implementation of SOAP web service interfaces
- Design and implementation of an HTML5-based test Workbench based on Junit regression tests
- Infrastructure planning and coordination build management and release management
- Multi-level deployment test support
- Test management
- Test programming
- Load test and edge test case preparation and execution
- Requirements management - change requests
- Requirements management - risk management
- Requirements management - estimation and planning
- Requirements management - Traceability
- Project support in the field of infrastructure: networks, Websphere systems, interfaces
Business Analyst/UML Modeller
Volkswagen Financial Services
Object-oriented modeling of leasing-relevant components in highly distributed SAP and mainframe system landscapes
In the specialist procedure leasing. Implementation of technical fine concepts in UML with the help of and within the framework of software architecture patterns, e.g. Entity Control Boundary (ECB) for component separation and Publish & Subscribe for system encapsulation.
- Modeling of the software components in direct cooperation with the department and the developers
- Onboarding of new employees with the complex software development process and the modeling guidelines
- Support and implementation of quality gates during the creation and addition of the technical fine concepts and modeling
- Estimation of expenses of change requests
- Dialogue modeling in UML
Managing Partner
tape.io GmbH
Managing founder and shareholder in the cloud/technology startup doctape. Asynchronous programming (nodejs), single language architecture (JavaScript), no-SQL database (CouchDB), hybrid mobile apps (Appcelerator, HTML5, IOS, Android).
- Management activities
- Business development
- Roadmap management
- Press and publicity measures
- Employee management
- KPI measurement (K), detection und analysis
- Test management
Project Management
Fiducia GAD AG
Implementation of the technical concept for the highly automated processing of KWG $18 compliant document requirement for german credit law (KWG $18) ready Document request in the credit procedure.
- Creation and maintenance of project plan
- Estimation and control of expenses
- Planning and control of work packages
- Status and general reporting to the client
- Business related Contact person for the planing of project staffing
- Implementation of internal QA measures
- Implementation of QA measures of the contractor (for example: procedure model and framework compliance)
- Planning and creation of test cases
- Processing of change requests as well as their effort estimate and appropriate offer formulation
Business-analyst/Conceptualizer, Technical concept
Fiducia GAD AG
Creation of the technical concept. Implemented for the highly automated processing of a KWG §18 (germany credit law) Compliant document request in the credit process. The application is integrated into the core banking system bank21 and has a high proportion of highly automated (mass) dark processing.
It determines the need for documents to be requested and controls the mass dispatch of the cover letters at certain times.
- Accompaniment and moderation of requirement workshops
- Creation of the technical concept in close coordination with the customer
- Business process modeling (BPMN)
- Use case modelling
- Modeling of the technical data model
- Professional service modeling (service cut)
- Modeling of the domain class model
- Design of desk tests
Senior Developer
Nord/LB
Implementation of several banking domain specific procedures:
- Mavis: Design and implementation of the Mavis web application to control the securities business of Nord/LB (Depot A) as part of the host front-end replacement due to the Landesbanken migration to OSPlus. Technical support for the introduction of component tests by means of Junit.
- ADD-Base: Design, implementation, control and monitoring of the subsequent integration test of the sub-application ADD condition fees procedure as part of the BaseOne host front-end replacement due to the OSPlus migration of Nord/LB.
- FWV-Base: Partial conception, design and implementation of the BaseOne frontend for the existing host application "foreign currency procedure", which serves the management of foreign currency accounts and clients (savings banks).
Senior Developer
Nord/LB
Implementation of a domain specific banking procedure
- DU/Udefix, Value at Risk III: Design and implementation of a plug-in module for the LDU application for liquidity control in the foreign exchange business of Nord/LB (bank control)
Senior Developer
Nord/LB
Implementation of a domain specific banking procedure
- Global-Cash Reengineering: Implementation of a subsystem to replace the host frontend to manage account statements for foreign currency accounts and to display SWIFT messages
- ADD/Base Reegineering: Implementation of a subsystem to replace the host front end for managing bookings on foreign currency accounts using the BaseOne framework using DB2 and S2Skom
Business-analyst, architect, project lead
CS Consulting AG
Project: GOAL - Requirements analysis, specification and development of a procedure model for SOA projects
- Design of patterns/architectural patterns in the SOA environment
- Use of web services
- Definition off services
- Reference-Implementation
- Documentation
Senior Developer
Pelion XII AG
Expansion of the B2B shop of a tire wholesaler
- Analysis, design, implementation and production of the largest web-based B2B shop for tires in Germany (reifen.com)
- Implementation of front- and backend components as well as integration into inventory systems and third-party systems
Senior developer/technical Project lead
SGH AG
Automated invoice verification of supplier invoices (Accounts receivable audit).
- Definition of the target processes with the customer
- Design and specification of process models and activity diagrams
- J2EE design and implementation of a multi-tenant integration solution for automatic mass processing of commercial invoices at invoice receipt
- Agile scrum based development
Senior Developer
Pelion XII AG
Creation of a web app to carry out centralized settlement processes
- Maintenance and further development (including quotation and sales support) of the multi-client solution for managing a bank's del credere business and for integrating del credere-relevant changes into the central settlement interface
- Agile scrum based development
Diploma student/diploma intern
I-CON GmbH
Preparation of the thesis
- Title "Evaluation of EAI strategies and their prototypical implementation using IBM Websphere Portal Server"
Working student/Technical project manager
I-CON GmbH
PoC for automatic credit monitoring in bulk business (overdraft facility/current account)
- Analysis, design and implementation of a scoring system based on mass credit data from the GAD environment (BB3)
- Early identification of credit risks in the current account portfolio
Freelancer
Obi@Otto
Implementation of several IT projects
- Agile planning and implementation of the intranet: technical management and project management
- Planning and implementation of a mini-OLAP on web analysis: Requirements Engineering, design, analysis and implementation of a database-driven application to evaluate the user data of the then largest online store for do-it-yourself supplies on the German Internet
Student
Leuphana Universität
Implementation of various student IT projects
- Self-replicating, distributive, alternate programs via P2P (peer-to-peer)
- Rating of real estate via scoring mechanisms
- VIP Student "Email Call Center" - Inbound Marketing for Students
- Internship in Datawarehouse/Catalog Marketing at Otto Versand
Working student
ricardo.de
Implementation of several IT projects
- Maintain multichannel database for auctions (CRM)
- Create landinpages
- Implement product features for core business (auction platform)
- Implementation of a price calculator
- Creation of a portal for reverse auctions