Selected Projects

A selection of the platforms, products, and research programs we have delivered for clients including Deutsche Telekom, T-Systems, SAP, IONOS, and Daiteap — spanning cloud and multi-cloud, Big Data, blockchain, and real-time communication.

Cloud & Data Infrastructure

GAIA-X Federation Services

T-Systems International GmbH · 2022–2023

Core federation services for the European GAIA-X ecosystem — a connected, open data infrastructure based on European standards and values. The services are distributed, decentralized, and designed for secure data transfer across cloud providers.

Core components: Identity & Trust · Federated Catalog · Sovereign Data Exchange · Compliance

Key technologies: Kubernetes, Helm, Docker, CI/CD

• Deployed multiple services on Kubernetes using CI/CD and Helm
• Implemented new services: Principal Creation, Invitation, DID Management, and Claim Mapper
• Automated service integrations and created Docker images for existing services

ALTERNATIVE

EU Horizon 2020 · 2021–2024

A platform that detects the cardiotoxicity of chemicals and their biotransformation products, helping regulators and industry identify and prevent cardiotoxic co-exposures. CST delivered the cloud data platform and web-based data exchange that power the research.

Key technologies: CKAN, JupyterHub, S3, OIDC/SSO, Keycloak, Kubernetes, Istio

• Developed a cloud data platform for deploying and operating machine-learning models
• Built a CKAN-based data exchange with custom extensions for OIDC/SSO, S3 storage, and theming
• Integrated JupyterHub, CKAN, and S3 with CI/CD automation

Digital Experience Portal (DXP)

SAP · 2021–2022

An integrated developer portal (similar to Spotify Backstage) for managing the software development process — code repositories, release management, security, logging, and infrastructure monitoring. DXP extends the Kubernetes API with custom resources, operators, and controllers.

Key technologies: Golang, Kubernetes/Docker, GraphQL, Terraform, Angular, Dynatrace, AWS/GCP

• Implemented logging and monitoring with fluentbit, Kibana, and ElasticSearch/OpenDistro
• Built a Kubernetes operator automating GCP load-balancer and routing configuration
• Implemented secret management with External Secrets Operator, HashiCorp Vault, and Kubernetes

Daiteap Multi-Cloud Platform

Daiteap GmbH & Co. KG · 2019–2023

Project management and technical architecture of a cloud-native multi-cloud orchestrator. The platform manages Kubernetes clusters, virtual machines, and S3 storage across AWS, GCP, Azure, Alicloud, on-premise, and IoT devices — with encrypted VPN interconnection.

Key technologies: AWS, GCP, Azure, Alicloud · Golang, Python/Django · Kubernetes, Docker, Cluster-API, Helm, CEPH, ArgoCD, Longhorn · Terraform, Ansible · Keycloak, PKI, OIDC · VueJS

• Integrated major public cloud provider APIs
• Designed network topology using VPN, IP routing, DNS, TLS, centralized IDM, and monitoring
• Implemented multi-tenant functionality and managed backend and frontend teams

DataLab / HALO

Deutsche Telekom AG · 2015–2019

Big Data infrastructure as a service on Open Telekom Cloud. DataLab provided multi-tenant Hadoop environments, while HALO extended it with fully automated provisioning of cloud resources, Hadoop clusters, and security services.

Key technologies: Cloudera Enterprise, Hortonworks · HDFS, Hive, Spark, Impala, HBase, Kafka · Ansible, Terraform, OpenStack · Kerberos, LDAP

• Designed and implemented the software-as-a-service layer on OpenStack
• Automated Hadoop distribution installation, configuration, and user management
• Managed resource allocation, performance analysis, and monitoring

Octave

Octave IO · 2018–2021

A cloud-based Big Data analytics platform based on Hortonworks Hadoop, hosted on OVH and GCP, with REST APIs for data ingest and access, SSO, identity management, logging, and monitoring.

Key technologies: Hortonworks, NIFI, HDFS, ELK stack, Kubernetes, Python/Django

• Implemented Python/Django functionalities to specification
• Packaged and deployed with CI/CD
• Maintained and bug-fixed production servers

Blockchain & DLT

NOMAD

Deutsche Telekom · 2018–2022

A blockchain platform for signing roaming and mobile data contracts between mobile network operators worldwide, based on Hyperledger Fabric.

Key technologies: Hyperledger Fabric, PKI, HSM, SoftHSM, Kubernetes, OpenSSL, Golang/Node.js

• Architected the Hyperledger adaptation for the NOMAD use case
• Migrated the platform to Kubernetes and set up core and operator network components
• Supported MNO technical teams and participated in GSMA technical discussions

DIMAS

Deutsche Telekom · 2021–2022

Self-sovereign identity (SSI) use cases built on decentralized identifiers (DIDs) — issuing, holding, verifying, and presenting verifiable credentials on a Hyperledger Indy ledger.

Key technologies: Node.js, ACA-py, k3s Kubernetes, Hyperledger Indy

• Built Kubernetes deployments and Docker images
• Automated deployment of organizations joining the network
• Set up and joined a demo organization network on AWS

Nylon

Deutsche Telekom · 2022–2023

An environment for managing a stable coin used in payments between telecom operators, eliminating exchange-rate risk between currencies under telco contracts.

Key technologies: Celo Alfajores Testnet, Node.js, AWS EKS, ingress controller with cert management

• Prepared the AWS network environment and built Docker images
• Deployed the solution and its automation packages on AWS

Telco-DLT

Deutsche Telekom · 2022–2023

Research of distributed ledger technologies (DLTs) — measuring performance and developing telco use cases for collecting, processing, and storing network data in real time.

Key technologies: Hyperledger Fabric, Celo, Hyperledger Caliper, JMeter, Kubernetes

• Built a Hyperledger Fabric test network with smart contract chaincode
• Ran distributed performance testing with Hyperledger Caliper
• Automated deployments on AWS

AI & Big Data

Digital Service Assistant (ELIZA / DSA)

Deutsche Telekom AG · 2016–2020

An AI customer-support assistant that automates parts of customer service by learning from user data and activity. Data is ingested into a Hadoop cluster, processed, and used to power AI use cases.

Key technologies: Python/Django, Kubernetes, Docker, NIFI, HDFS, HBase, Kafka, Solr

• Implemented the ELIZA AI assistant with data ingest and access paths based on NIFI and HBase
• Built microservice-based customer-service use cases on Kubernetes
• Implemented CI/CD pipelines for automated deployment

Data Spaces & Energy

IONOS Data Spaces (POSSIBLE, HEALTH-X, Marispace)

IONOS · 2023

Architecture consulting and DevOps for GAIA-X and IDS-based data space technologies across IONOS sub-projects — including healthcare (HEALTH-X) and maritime (Marispace) use cases.

Key technologies: GAIA-X, IDS, Eclipse Dataspace Connector (EDC), DAPS, Terraform, Kubernetes

• Designed architectures for the POSSIBLE data-space project
• Dockerized GAIA-X services (Federated Catalog) and automated infrastructure with Terraform
• Packaged and deployed the EDC Connector, IDS DAPS, and IoT OpenTwins platform

Frodexim

Frodexim Trade Ltd · 2021–2022

An open-market system for exchanging electricity usage information on the Bulgarian energy market, implementing six modules per the ESO specification.

Key technologies: Docker, .NET Core 6.0, XML/XSD, REST API, Keycloak

• Implemented settlement, billing, metering, invoice, and data-exchange modules
• Built the user-management module with Microsoft Blazor
• Packaged and deployed the whole solution with docker-compose

Communication & VoIP Heritage

Over the years CST has also delivered telecom and real-time communication platforms:

• RCS-e / Joyn (Deutsche Telekom, 2011–2012) — SIP-based backend and messaging platform for the RCS-e standard
• PAYCALL (Headstore AG, 2015–2016) — WebRTC voice and video calling platform on AWS
• T-Voice (Deutsche Telekom, 2008–2009) — unified messaging combining voicemail, email, SMS, and Skype
• Soundcall (Soundcall GmbH, 2012–2013) — IMS-integrated sound-mixing service for live calls
• RingRTC (2014–2015) and Voiptester (2012–2014) — in-house WebRTC and VoIP products
• Voicemail-to-Text (Deutsche Telekom, 2010–2011) — speech-to-text voicemail proof of concept

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