Hans-peter M. - Developer

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Neukirchen, Germany

Experience

Sep 2022 - Apr 2024

1 year 8 months

Germany

Developer

Systemhaus der Bundesagentur für Arbeit

Portal for submitting and processing child benefit applications.
Development of microservices and frontends to handle child benefit applications within the Federal Employment Agency’s infrastructure.
Backend: Built event-driven microservices with REST controllers and services; mapped data with JSON models; produced and consumed Kafka streams; generated PDFs.
Frontend: Developed smart components, services, and guards; handled REST streams with observables using the reactive programming paradigm; integrated Web Components; implemented user authentication with OIDC/OAuth2 and JWTs; set up Keycloak for easy identity provider integration and two-factor authentication; created mockups for planning, implementation analysis, and feasibility studies.
General: Analyzed and implemented business requirements; performed code reviews; maintained CI/CD pipelines; carried out refactorings; led sprint reviews; monitored live applications via Kibana and Grafana.
Technical environment: OS: Linux, Windows; IDE: IntelliJ IDEA, WebStorm; Languages: TypeScript, Java 17; Frameworks: Angular, Spring Boot; Build tools: Jenkins, NPM, Maven; Tools: Jira, Confluence, GitLab, Bitbucket.

Jan 2022 - Jul 2022

7 months

Germany

Architect, Developer, Coach, Consultant

Bundesdruckerei GmbH

Portal for searching public tenders on behalf of the federal government.
Planned architecture and developed the web platform (frontend and backend), integrated into existing infrastructure.
Increased team productivity by about 200% through selecting and introducing a suitable framework.
Technical lead for the development team.
Re-implemented the existing application with Vue.js, including justification for re-implementation, architecture planning, and component and application structure implementation.
Defined project structure and style guide.
Set coding standards.
Introduced Redux in the frontend and coached the team.
Defined a view model based on an eForms abstraction (European standard for exchanging tenders).
Developed methods to optimize local development environments.
Optimized backend code following hexagonal architecture.
Defined database structure.
Implemented REST endpoints for user login via ELSTER authentication (OAuth2).
Technical environment: OS: Linux, Windows, macOS; IDE: IntelliJ IDEA Ultimate; Languages: TypeScript, Java 17; Frameworks: Vue.js, Spring Boot; Build tools: NPM, Maven; Tools: Jira, Confluence, GitLab; Architecture: Hexagonal Architecture.

Jul 2021 - Oct 2021

4 months

Germany

Developer, Architect, Coach, Consultant

Emil Frey

Planned, architected, and developed submodules of a platform for buying and selling vehicles.
Built custom components for a client-developed component library.
Coached team members on Angular, clean code, and common programming principles.
Developed input and control components.
Implemented an existing atomic design framework.
Built submodules, services, and routing.
Trained staff on best practices and Angular.
Integrated external scripts.
Advised IT leadership on optimizing the development process.
Outsourced SEO optimization to an external provider.
Technical environment: OS: macOS; IDE: IntelliJ IDEA Ultimate; Language: TypeScript; Framework: Angular 12; Build tool: Angular CLI; Tools: Jira, Bitbucket.

May 2020 - May 2021

1 year 1 month

Germany

Developer, Founder, CEO, Architect, DevOps Engineer

Martini Labs

Implemented a platform to manage, analyze, and collect leads from online marketing campaigns.
Drafted the business idea, business plan, and application architecture.
Built the MVP and set up cloud infrastructure with Firebase as an Angular Material app.
Conducted feasibility studies.
Gathered requirements.
Designed architecture.
Built the MVP.
Selected and set up a cloud-based backend.
Managed users via Firebase Authentication with JWT.
Stored data in Firestore.
Created reporting.
Designed funnel pages and application forms.
Technical environment: OS: macOS; IDE: IntelliJ IDEA Ultimate; Language: TypeScript; Framework: Angular 10; Build tool: Angular CLI; Database: Firestore; Tools: Firebase, YouTrack, GitLab; Testing: Jasmine.

Mar 2020 - Jun 2021

1 year 4 months

Germany

Developer

BG-Phoenics GmbH

Built a customer portal with Angular and Angular Material.
Rebuilt one of several apps and merged them into a monorepo as a coherent portal.
Migrated the existing app into an Nx monorepo.
Reimplemented legacy components and services.
Applied sustainable architecture, coding standards, and best practices.
Refactored and extracted shared components and services into a library for monorepo-wide use.
Introduced an NgRx store with the facade pattern.
Negotiated REST APIs with the backend.
Connected to microservices via REST interfaces.
Wrote unit tests with Jest.
Technical environment: OS: Windows; IDE: IntelliJ IDEA Ultimate; Language: TypeScript; Frameworks: Angular 10–12; Build tool: Angular CLI; Tools: GitLab, Jenkins, SonarQube, OpenShift; Testing: Jest.

Sep 2018 - Dec 2019

1 year 4 months

Germany

Developer

SMA Solar Technology AG

Contributed to energy plant control and monitoring projects.
For energy control: developed Modbus and SunSpec protocol implementations for RS485 and TCP.
Tasks (energy control): requirement analysis, Scrum ticket prep; refactoring (simplified project structure, optimized data flow, added interfaces); implemented a hardware communication and control module; extended API with Swagger; wrote unit tests; code reviews.
Technical environment (energy control): OS: macOS; IDE: IntelliJ IDEA, Eclipse; Language: Java; Frameworks: OSGi, Apache Felix; Build tools: Gradle, bnd; Databases: PostgreSQL, TimescaleDB; Tools: YouTrack, GitHub, GitLab CI, Docker, Swagger; Testing: JUnit.
For monitoring: developed a new web service to monitor devices at customer sites.
Tasks (monitoring): requirement analysis, Scrum ticket prep; built components for filter inputs and display; extended test backend; expanded API endpoints for database operations; wrote unit tests; code reviews.
Technical environment (monitoring): OS: macOS; IDE: IntelliJ IDEA; Languages: Kotlin, TypeScript; Frameworks: Angular, Spring Boot; Build tools: Maven, Gradle; Databases: PostgreSQL, TimescaleDB; Tools: YouTrack, GitHub, GitLab CI, Docker, Kubernetes, Helm; Testing: JUnit, Karma.

Sep 2018 - Sep 2018

1 month

Germany

Developer, Team Lead

Werkstattportal (Project)

Web portal for searching and booking car services.
Requirement analysis, Scrum ticket prep.
Built a microservice to fetch and deliver scraping data.
Defined data formats returned by the scraping API.
Parsed, stored, and provided data.
Defined API for data retrieval.
Implemented endpoints to fetch data.
Wrote unit tests.
Code reviews.
Handled customer communication.
Led the team.
Technical environment: OS: macOS; IDE: PHPStorm; Language: PHP7; Framework: Laravel; Tools: YouTrack, Bitbucket, ScrapingHub; Testing: PHPUnit.

Aug 2018 - Aug 2018

1 month

Germany

Developer

4Mular (Project)

Redeveloped a web portal for automated PV system registration.
Improved code quality by applying best practices.
Wrote unit tests.
Code reviews.
Technical environment: OS: macOS; IDE: IntelliJ IDEA; Languages: TypeScript, Kotlin; Frameworks: Angular 5, RxJS, NgRx; Build tools: Maven, npm; Database: PostgreSQL; Tools: YouTrack, Bitbucket, Git, Docker Compose, Selenium, Kubernetes, Helm.

Oct 2017 - Jul 2018

10 months

Germany

Developer, Consultant

Facto (Project)

Web platform for reversing life insurance policies.
Portal for customers, case workers, and lawyers to submit applications, manage documents, calculate reimbursement, assess entitlements, and manage clients.
Symfony 3 monolithic backend.
AngularJS frontend.
Roles and permissions: chose a paradigm (ACLs vs. voters); built the base system with voters; refactored the app to use it.
State machine to model process lifecycle: evaluated tools and approaches; implemented a state machine using decorator and visitor patterns.
Designed and implemented database schema, repositories, and services.
Created fixtures for test data.
Wrote a Docker Compose script for a consistent local setup.
Wrote unit tests.
Code reviews.
Technical environment: OS: macOS; IDEs: PhpStorm, WebStorm; Languages: PHP, JavaScript; Frameworks: Symfony 3, AngularJS; Build tool: Yarn; Database: PostgreSQL; Tools: GitLab, YouTrack, Docker, Docker Compose; Testing: PHPUnit, Karma.

Sep 2017 - Sep 2017

1 month

Germany

Developer, Mentor, Coach

timeBuzzer GmbH

Serverless EVA microservice.
Middleware linking time-tracking tools and project management platforms.
Stateless worker, I/O via platform APIs.
Minimal UI as JWT auth proxy.
Requirement analysis and client communication.
Designed and built a stateless microservice: DB design; implemented an import module triggered by webhook consuming a service API; set up internal and external data models; parsed external API data into the internal model; provided parsed data to client systems; used client system for auth (JWT stored after login).
Designed login UI: retrieved user token from backend; minimal user management.
Wrote unit tests.
Code reviews.
Coached, handed over, and supported working students.
Technical environment: OS: macOS; IDE: IntelliJ IDEA; Languages: Kotlin, TypeScript; Frameworks: Spring Boot, Angular 5; Build tools: Maven, npm; Database: PostgreSQL; Tools: Webhooks, JWT; Testing: JUnit, Karma.

Nov 2016 - Sep 2017

11 months

Germany

Developer

CI-Plattform (Project)

Ongoing development of a CI platform: new features and bug fixes.
Tasks: requirement analysis, client communication, Level 3 support, feature development, unit and UI tests, documentation updates.
Technical environment (general): OS: Linux; IDEs: PHPStorm, GoLand, IntelliJ IDEA; Languages: PHP, JavaScript, Go; Frameworks: Symfony 2, AngularJS, Doctrine, Swiftmailer; Tools: GitHub, Bitbucket, GitLab, shell scripting, Sublime Text; Testing: PHPUnit, Selenium, Behat.
Built a server daemon with a CLI-based control client for container management to provide Docker machines due to LXC incompatibility (July 2017).
Tasks (container management): requirement analysis, debug with XTrace, chose tech and libraries, implemented client/server daemon.
Technical environment (container): OS: Linux; IDE: GoLand; Language: Go, Unix shell; Tools: Sublime Text, Docker, Docker Machine, Boot2Docker, KVM, libvirt, virsh, XTrace.
Rebuilt a matching component for context-based matching (April 2017): requirement analysis, algorithm design and implementation, performance profiling, unit tests.
Technical environment (matching): OS: Linux; IDE: PHPStorm; Language: PHP; Framework: Symfony 2; Testing: PHPUnit, Backfire.
Added VNC recording: captured UI tests, reworked VNC tools, adapted to CI environment (February 2017): analysis, codec selection (FFmpeg), XServer capture and compression, auto-upload to AWS EC2, stream delivery.
Technical environment (VNC recording): OS: Linux; IDEs: CLion, PHPStorm; Languages: C, PHP, JavaScript; Frameworks: AngularJS, Symfony 2; Tools: various VNC implementations, XServer, Chef, Node.js.
Built a VNC browser view for video debugging of UI tests (January 2017): analysis, tech selection for XServer capture in LXC, adapted noVNC, built a Node.js reverse proxy, delivered the stream.
Technical environment (VNC view): OS: Linux; IDEs: CLion, PHPStorm; Languages: C, PHP, JavaScript; Frameworks: AngularJS, Symfony 2; Tools: various VNC implementations, XServer, Node.js.

Aug 2011 - Oct 2016

5 years 3 months

Germany

Developer, Admin, Team Lead, Technical Project Lead, Technical Strategy Consultant, Project Manager

Employer in Tourism Sector

Developed and maintained various systems and projects in tourism.
Print system for travel documents (smart client with WinForms UI): ongoing enhancements for printing travel documents and invoices; implemented scheduled server jobs and Aztec code generation; maintained and calibrated production printers; server administration; deployment; recruiting; team leadership.
Tasks (print system): analysis, design, implementation, testing, consulting.
Technical environment (print): OS: Windows, Windows Server; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: .NET, WinForms; Databases: MS SQL Server, MySQL; Tools: Git, Sublime Text; Testing: Microsoft Unit Test Framework, manual.
Outsourced the print system: managed development and deployment with an external provider (02/2015–10/2016): requirement analysis, client alignment, design, implementation, testing, consulting, go-live.
Technical environment (outsourcing): OS: Windows; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: ASP.NET, .NET, WebForms, WinForms, Microsoft MVC; Database: MS SQL Server; Tools: Git, Sublime Text; Testing: Microsoft Unit Test Framework, manual.
Re-implemented the print system: replaced a legacy smart client and reused logic (02/2015–10/2016): requirement analysis, client alignment, design, implementation of desktop app and databases, unit and manual tests, consulting with management and clients.
Technical environment (re-implementation): OS: Windows, Windows Server; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: ASP.NET, .NET, WebForms, WinForms, Microsoft MVC; Database: MS SQL Server; Tools: Git, Sublime Text, Hyper-V; Testing: Microsoft Unit Test Framework, manual.
Desktop app for flight refund processing (WinForms UI): ongoing enhancements; manual SQL queries for custom client requests.
Tasks (flight refund): requirement analysis, client alignment, design, frontend, backend and DB implementation, unit and manual tests, consulting.
Technical environment (flight refund): OS: Windows; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: .NET, WinForms; Databases: MS SQL Server, MySQL; Tools: Git, Sublime Text; Testing: Microsoft Unit Test Framework, manual.
Web apps for travel data management: maintained master and travel data applications (02/2015–10/2016).
Tasks (data management): requirement analysis, client alignment, design, frontend, backend and DB implementation, unit and manual tests, consulting, deployment.
Technical environment (data management): OS: Windows, Windows Server; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: ASP.NET, WebForms, Microsoft MVC; Database: MS SQL Server; Tools: Git, Sublime Text, Hyper-V, IIS; Testing: Microsoft Unit Test Framework, manual.
Outsourced IT infrastructure to a provider (project lead, 01/2015–06/2015): saved ~20% dev effort by offloading admin tasks; introduced security and backup concepts.
Tasks (IT outsourcing): resource, budget and capacity planning; process control; provider coordination; schedule planning and system preparation.
Technical environment (IT outsourcing): OS: Windows, Windows Server; Databases: MS SQL Server, MySQL.
Web apps for electronic travel documents: customer portal for travel info.
Tasks (e-docs): requirement analysis, client alignment, design, frontend, backend and DB implementation, unit and manual tests, consulting, deployment.
Technical environment (e-docs): OS: Windows, Windows Server; IDE: Visual Studio; Languages: C#, JavaScript; Frameworks: ASP.NET, .NET, Microsoft MVC; Database: MS SQL Server; Tools: Git, Sublime Text, Hyper-V, IIS; Testing: Microsoft Unit Test Framework, manual.