JSON Experts in Frankfurt

Ali Aminian

Enterprise Software Architect | Cloud, Integration & AI Platforms

Frankfurt

Last position:

Platform Engineer & Software Architect at Yatta GmbH

Architected the Yatta Integration Layer – a config-driven integration platform on Java 25, Spring Boot 4 (WebFlux), Temporal, gRPC and Kafka, enabling new third-party integrations (e.g. AVS fulfillment) via declarative JSON configs with zero code changes.
Designed and implemented Tink integration with 0Auth IBAN verification to enhance fraud prevention and account validation workflows with Adyen payByBank.
Architected and implemented an OpenFGA-based authorization model for centralized management of users, groups, and fine-grained access control in the vendor portal.
Architected and led delivery of the Yatta API Gateway platform using GraphQL Federation, providing a unified enterprise API layer across distributed microservices with centralized authentication, authorization and request orchestration.
Replaced NGINX + NLB with Istio service mesh and AWS ALB; rolled out WAF, OAuth (Cognito), IP whitelisting and RBAC across environments.
Migrated CDC from Confluent Cloud connectors to a self-hosted Kafka Connect + Debezium stack, reducing operational cost by ~80% across multiple environments.
Implemented the Transactional Outbox pattern with Debezium for reliable, exactly-once event publishing to Kafka with Avro and Schema Registry.
Migrated dunning/payment-recovery workflows from Airflow to Temporal, achieving 99.9% reliability for settlement handling.
Optimised Apache Airflow with deferrable sensors to handle 1000+ concurrent DAG runs without scaling the worker pool.
Refactored a monolithic Terraform codebase into 3 modular projects, cutting deployment time by ~45%.
Stood up full observability with OpenTelemetry, Tempo, Prometheus and Loki; automated dev/staging/prod with ArgoCD, Image Updater and Helm.
Collaborated with product, operations and engineering stakeholders to define scalable platform architecture and integration standards aligned with long-term business and operational goals.

Kevin Fischer

Senior Consultant and Platform Engineer

Frankfurt

Last position:

DevOps and Platform Engineer at DB Systel GmbH

Error analysis and fixes including performance optimization of the in-house developed platform API
Change and incident management in day-to-day operations
Responsible for compliance with security and compliance requirements
Vendor management for software development and maintenance
Planning and execution of migration of legacy services to a cloud native platform

Role in the project: project staff, implementation team

Used skills: requirements analysis, IT service and application management, IT operations, error analysis and performance optimization, software maintenance and lifecycle management

Project environment: Cloud Native Platform (Kubernetes, Crossplane, AWS, ArgoCD, Grafana)

Torsten Feix

Data Analyst, Requirements Manager

Dreieich

Last position:

Data Analyst, Requirements Manager at Isabellenhütte Heusler GmbH

Analysis of the existing reporting platform including processes and governance topics with stakeholders from sales and marketing.
Detailed analysis and evaluation of client-defined requirements for existing reporting and new dashboards.
Supporting stakeholders in managing sales processes and early detection of KPI trends.
Use of Microsoft Power BI as central analysis and reporting platform.
Developing a proposal for the necessary evolution of processes and the Power BI platform.
Gathering current business processes and defining company-wide KPIs in coordination with stakeholders.
Analysis and inventory of the client's Power BI platform.
Analysis of processes and data governance.
Recording and documenting current business processes.
Developing recommendations for process and reporting platform improvements.
Designing and implementing dashboards in Power BI.
Defining company-wide KPIs and aligning them with stakeholders.
Microsoft Power BI.
Data analytics.
KPI definition and reporting.
Dashboard design and data visualization.
Stakeholder management and requirements management.

Kevin Grundmann

AI Strategy & Governance / Freelancer

Bad Vilbel

Last position:

AI Strategy & Governance / Freelancer at Al Gambit

Architect AI strategies and smart business processes for companies implementing AI initiatives.
Focus on pragmatic and trustworthy AI integration delivering tangible operational value.

Basil Sattler

Senior Developer / Data Engineer

Last position:

Senior Developer / Data Engineer at Large energy-sector company

Co-founded the Real-Time Data team, which grew to 10 members over time.
Developed and delivered core data products.
Optimized real-time application performance and implemented monitoring, alerting and logging solutions to ensure system stability.
Created and maintained deployment pipelines.
Collaborated with teammates, architects and experts in an agile Scrum environment.
Operated applications, analyzed, tested and troubleshot software solutions.

Onik Mia

SAP SuccessFactors & S4HANA Consultant

Frankfurt

Last position:

SAP SuccessFactors & S4HANA Consultant at Banking Industry

Extracted relevant infotypes from SAP HCM for migration to SuccessFactors Employee Central and mapping to ECP fields.
Configured P2P integration including BAPI setup and secured data exchange with HTTPS and OAuth protocols.
Set up foundational settings in Recruiting (REC) including roles, permissions, and job requisition templates.
Implemented Career Site Builder to create a branded candidate experience and integrated external job boards.
Configured candidate application workflows, screening, interviewing, and hiring communication templates.
Set up pre-screening questions and assessment tools including DHB sanction list checks.
Implemented automated background check and KYC integration with external vendors in the REC module.
Localized job requisition templates to reflect regional job titles and regulatory compliance.
Customized onboarding document templates and localized document archiving protocols (DRTM).
Adjusted onboarding forms to capture country-specific employee information including Form I-9.
Enabled Form I-9 remote document verification and integrated eVerify with SuccessFactors.
Set up automated reminders for employees and HR to complete I-9 sections within deadlines.
Configured pre-Day 1 access for new hires to complete tasks and mandatory trainings prior to start date.
Enabled e-signature integration for onboarding documents to support remote verification.
Technologies: SAP SuccessFactors, BTP, CPI, HCM onPremise, EC, ECP, REC, ONB, Form I-9, eVerify, S4HANA.

Ulm Paunel

Freelance IT Specialist

Steinbach (Taunus)

Last position:

DataStage ETL Expert at ING Bank

Datastage 11.7, dbt, Oracle 19, Python 3.12 / PySpark 3.5, Azure GitHub, Azure DevOps, Automic
Development of migration jobs to transfer data from the collection DWH to the new Risk Mart, as well as development of ETL pipelines to migrate historical data from the old Mart to the new Risk Mart.
Storage of the silver layer on Hadoop and the gold layer in Oracle.
Translation of DataStage jobs into dbt to publish reporting data in Google Cloud to a PostgreSQL database.
Creation and optimization of complex SQL queries for data extraction from a data vault, taking into account historical data in the point-in-time tables.
Creation of Oracle table definitions (DDL) and adjustment of existing stored procedures.
Versioning changes in GitHub and deployment via the CI/CD portal.
Refactoring long-running DataStage jobs into Python using PySpark to reduce server load.
Migration of SAS scripts to PL/SQL, including new development of distribution functions that have no direct equivalent in Oracle.
Development of Automic jobs to run DataStage pipelines and Python scripts (PySpark jobs) that control the population of the SME and institutional risk tables in the Risk Mart and perform business calculations.
Participation in the agile process, including creating user stories, estimations, and planning in Azure DevOps.
Handling Azure DevOps tickets and close collaboration with testers and business teams for error analysis and resolution.

Andreas Ilias

Senior Cybersecurity Governance & ISMS Consultant

Last position:

Cybersecurity Specialist Assessor at Bundesnetzagentur

Recognition of national notified bodies
Preparation of cybersecurity competency reports
EU Radio Equipment Directive

Werner Keil

Test Coordinator, Designer and Engineer

Bad Homburg

Last position:

Test Coordinator, Designer and Engineer at IBM

Testing the SekIDP and related components
Test design, execution and automation, microservices, GitHub Enterprise, Eclipse, Katalon Test Platform, API Testing, Confluence 8, JIRA/Xray, Draw.io, Swagger/OpenAPI, Postman, Docker, Kubernetes, Podman, PuTTY, E-Health, Telematik, Gematik standards, EPA, E-Rezept, sektoraler IDP, encryption, XaDES, PaDES, DICOM, HL7, FHIR, IHE, ICD, SSO, SAML/Shibboleth, OAuth, smartcards, JWT, two factor authentication Android and iOS, Wireshark, BrowserStack, Cypress, gRPC, REST, SOAP, WS-Security, Linux Shell, PowerShell, SSH/SSL, Java, Kotlin, Cordova, Gradle, Groovy, Python, TypeScript

Illia S

Front-End Developer

Last position:

Front-End Developer at Tangram Internet Services GmbH

IAUP (Interregional Academy of Personnel Management) commissioned the development of a distance learning system for its secondary school subdivision.
Development of the website [link]
Development of a billing system and integration with various payment systems
Development of a distance learning system based on the open source Moodle solution
Integration of the distance learning system into the user office on the [link] website
Front-end: Vue.js v2, Nuxt.js, JavaScript, HTML, CSS, SCSS
Back-end: LAMP (Linux, Apache, MySQL, PHP), PHP Framework Laravel, Redis, Swagger, MySQL 8.x, PayPal API
DevOps: Docker, CI/CD, GIT

Leonid Ravin

Business Analyst | Requirements Engineer (certified) | Requirements Manager

Last position:

IT Business Analyst / Requirements Engineer at S-Payment GmbH / Sparkasse (DSV-Gruppe)

Business analysis of payments for the introduction of Wero EPI in Germany.
Analysis and optimization of merchant processes in the context of acquiring and issuing.
Analysis of interfaces for instant payments.
Analysis of SCT-Inst processes, settlement mechanisms and reporting processes.
Identification and clarification of gaps in merchant processes.
Analysis and documentation of clearing and settlement processes.
OSPlus process analysis and documentation.
Coordination and alignment with scheme management as well as various payment service providers and financial institutions on merchant processes.
Preparation and follow-up as well as active participation in EPI meetings on technical coordination and regulatory topics in payments, including content familiarization and prioritization.
Preparation and documentation of project and steering committees in the EPI environment.
Creation of status reports for the subproject.
Maintenance and structuring of Confluence pages for project documentation.
Coordination and alignment with the issuing teams on individual customer processes as well as aligning with bank processes and acquirer processes in the Wero environment.
Communication with payment service providers regarding merchant and bank processes in the Wero environment.
Organizational support for project management in special tasks in the EPI and Wero environment.
Digital filing and documentation in Confluence and Microsoft Teams.
Planning, implementation and tracking of work packages and steps.
Quality assurance and project control.
Consulting on IT strategy, IT architecture and interface management in the EPI and Wero environment.
Technical environment: Jira, Confluence, XML, JSON, MS Office (Word, Excel, Teams, PowerPoint), SharePoint, Draw.io, Innovator, 3rd-level support, ITIL, creation and updating of software documentation, interface management, OSPlus, Scrum, KYC, payment, European Payments Initiative (EPI), Wero, Microsoft Loop, Instant Payments, SCT-Inst.

Rouven-Benjamin Timmann

Operations Leader

Nidderau

Last position:

Operations Leader at VKB

Operational management as well as functional and disciplinary leadership of around 34 employees (internal/external, national/international) with a budget responsibility of €2.5M
Project management for the digital transmission of health insurance contributions
Management of digitization projects (mainframe, CRM, databases, sales systems) with end-to-end responsibility
Ensuring operational compliance, especially data protection and regulatory requirements
Coordination of central interfaces between IT, procurement, finance, authorities, and customers
Setting up and optimizing efficient organizational and governance structures
Leading an agile team across nine operational areas

Michael Simann

Business Analyst & Product Owner

Last position:

Business Analyst & Product Owner at Deutsche Vermögensberatung (DVAG)

Product Owner for stakeholder management, backlog prioritization and sprint organization (refinements, planning, testing, release) in agile team (8 developers, 2 testers)
Scaled according to SAFe by introducing sub-teams and leading retrospectives for team development
Developed central DVAG commission system from batch to near-real-time processing (Kafka) including data migration and structure hierarchy
Specified functional, technical and quality requirements in close coordination with lead developers
Modeled complex business processes (BPMN) and interfaces (Kafka, REST, GraphQL)
Supported authentication (Keycloak), frontend development (Angular) and test automation (CI/CD, CDCT)
Accompanied cloud migration of microservices to Azure; created workbooks, dashboards and KQL queries for system monitoring
Analyzed and optimized database systems (CosmosDB, MongoDB, SQL) and reported via Power BI to manage commission competitions
Applied industry expertise in sales and structured sales model including overseeing financial products to market release

Simon Schilling

Home Charging Portfolio Project Manager

Last position:

Home Charging Portfolio Project Manager at OEM

Developing a strategy for the home charging portfolio of a leading German vehicle manufacturer
Determining requirements for the charging infrastructure
Deriving product recommendations for the components
Developing an offering strategy for future charging equipment
Aligning product requirements with the manufacturer's brands
Designing supplier sourcing and selection

Krisztián Korcz