Wadim Lupejcenko-Fullstack Software Developer / Software Engineer

Development of a multi-tenant platform for social media management

The goal of the project is to develop a multi-tenant SaaS platform for planning, publishing, and analyzing social media content. In addition, it should support shared handling of messages and comments through central inbox and team features.

• Concept for post planning, central inbox, analytics features, and team workspaces
• Development of the frontend with React, Vite, and TypeScript
• Implementation of several backend services with NestJS and a shared NPM data model
• Building the data model with PostgreSQL, TypeORM, Redis, and Bull
• Integration of Meta Graph API and TikTok Open API for publishing and inbox features
• Connection of Stripe and S3 for billing, files, and platform data
• Building automated deployments with Docker, GitHub Actions, Helm/k3s, and Terraform

Label: TypeScript, React, Vite, NestJS, PostgreSQL, TypeORM, Redis, Bull, Docker, GitHub Actions, Helm/k3s, Terraform, Stripe, S3, Meta Graph API, TikTok Open API

New development of the vehicle planning and delivery system (FAPS)

As part of the modernization of a central backend application, the existing monolithic COBOL-based system was replaced by a service-oriented architecture with Spring Boot. The goal of the project is to make the digital mapping of vehicle planning and delivery future-proof and scalable.

• Work on the technical architecture and interface design
• Development of a service based on Spring Boot for migrating existing data to a new data model
• Development of REST APIs and the related service layer
• Development of middleware for integrating the new backend into an existing client
• Creation of unit and end-to-end tests
• Adjustment of build pipelines
• Developer training for the customer's employees (Java, Azure DevOps, general support)
• Support for testers and other project members
• Upgrade of the Spring Boot version (& Hibernate)
• Creation of documentation

Label: Java 8 and 17, Spring Boot, Spring JPA, Hibernate, Optimistic Locking (entity versioning), JUnit, Cucumber, PostgreSQL, Azure Cloud, Microservices, Azure Storage, Azure DevOps, Azure Kubernetes Service, RESTful Webservices, JSON, Scrum, Confluence, ArchUnit

Development of a system landscape based on CQRS for issuing GLN numbers

The goal of the project was to reimplement identifier issuance in a modern application architecture, as well as to modernize the IT infrastructure that had grown over many years by removing technical legacy issues and moving it to a future-proof base with the help of the Azure Cloud

• Implementation of microservices with NestJS (TypeScript, NodeJS)
• Development of REST & gRPC APIs
• Development of Azure Functions (JavaScript/ TypeScript, NodeJS)
• Containerization and orchestration with Kubernetes and Helm
• Implementation of CI/CD processes in Azure DevOps
• Adaptation of the frontend (VueJS, TypeScript, NodeJS)
• Maintenance / support

Label: TypeScript, Azure Cloud, Microservices, Azure Functions, Azure CosmosDB, Azure Service Bus, Azure Kubernetes Service, gRPC, ProtoBuff, Helm, Azure DevOps, GitLab, VueJS, RESTful Webservices, NestJS, mTLS, NodeJS, NPM, JSON, Scrum, Jira, Confluence

Extension of the open source software "SORMAS" for generating laboratory reports

The fire department of the City of Oberhausen planned to carry out Covid-19 tests at care facilities. For this, the software "SORMAS" was to be extended with the feature "generation of a lab order". To make processing more efficient, new bulk processing features were also to be provided.

• Development of a library for generating lab orders (Java 8)
• Adaptation of the backend (Java 8)
• Adaptation of the database schema
• Adaptation of the frontend (Vaadin 8)

Label: Java 8, Vaadin 8, Maven, Payara Server, PostgreSQL, Confluence, OpenSource

• Design, development, and implementation of custom software solutions for clients from various industries using Java, TypeScript, and C#
• Collaboration with clients and teams to analyze requirements and create technical specifications
• Optimization and further development of existing software solutions
• Implementation of APIs and integration of third-party services
• Creation of extensive tests to ensure software quality