Core Data Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used Core Data
Imane Habitou
Last position:
Assistant Manager People insights/Intelligence at adidas HQ
- Collected, analysed, and interpreted HR data from multiple systems
- Conducted ad-hoc people data analyses for stakeholders
- Supported Employee Listening and ensured actionable survey insights
- Built intuitive dashboards and visualizations in SuccessFactors, PowerBI, and Qualtrics
- Produced regular reports and dashboards on key HR metrics
- Contributed to people analytics projects as a junior team member
- Collaborated with HR Tech and Data teams to improve data quality
- Ensured ethical and governed data use with Legal, Data Privacy, Labour Relations and Works Council
Stéphane Tatuebu
Last position:
Senior Test Analyst – Test Automation - Test Management
- Testing interfaces between various systems
- Planning and coordinating test activities for features/improvements
- Selecting and adapting suitable test methods and procedures based on the test strategy
- Preparing and running test sessions
- Analysis, design, implementation, and documentation of manual and automated software tests
- Creating test cases and test scenarios using systematic test case specifications
- Performing and documenting system tests, regression tests, and smoke tests
- Monitoring and analyzing the executed test cases
- Maintaining and supporting the infrastructure and test data
- Analyzing and fixing error states related to test automation
- Documenting and tracking deviations, as well as supporting root cause analysis
- Analyzing errors and error tracking
- Working closely with product management
Basil Sattler
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.
Asım Yurduseven
Last position:
Freelance BI/DWH/ETL Specialist at Akbank
- Setting architectural standards for Informatica Power Center development teams
- Maintenance-performance-health for DWH (Exadata) environments
- Qlik Sense / BO reports architectural standards
- Implementing best practices in ETL tasks
- Documentation ETL standards on Confluence
- Dynamic Data Masking rules for GDPR/KVKK regulations by using Informatica DDM tool
- DWH Data model Power Designer
- Upgrade Qlik Sense versions
- Merge all Informatica server's repository databases on one Oracle DB
Natascha Fadeeva-Gladbach
Last position:
Senior iOS Developer - ANÜ at Stadtwerke München GmbH
- Development of an iOS app that combines public transport and sharing services
- Collaboration in Scrum within a large cross-functional team
- Creation of reusable components with SwiftUI and Combine
- Development of custom solutions for Apple Maps
Axel Kraus
Last position:
Data Engineer & Business Analyst at Metafinanz
- Migration of existing data jobs from Cognos Data Manager to Tibco/IBI Datamigrator
- Migration data jobs parametrisation for dynamic runs
- Optimisation and cutting-back
- Regression tests
- Knowledge transfer and documentation
José Jeria
Last position:
Freelance iOS Developer at Freelancer
PAYBACK GmbH: PAYBACK app - a loyalty bonus program and customer card that allows users to collect points.
Enhanced the application's architecture by restructuring and modularizing it.
Refactored and improved complex features using SwiftUI and The Composable Architecture.
Maintaining, bug fixing, optimizing, troubleshooting, and continuously improving the app.
Facilitating and planning the onboarding of new developers and providing mentorship.
Assistance in the hiring process, including evaluation, interviews, and strategic planning.
Porsche Digital GmbH: Development of the Porsche Road Trip app that allows users to comfortably plan and navigate through spontaneous drives and individual road trips along curated premium routes.
KI Labs: Development of a MVP for a large automotive company.
Snapp Mobile Germany GmbH: Equitel Banking - Consumer digital banking app for Equity bank, one of the largest banks in Sub-Saharan Africa.
comdirect Mobox - Banking app to manage current, savings and credit card accounts for teenagers. Addressed technicalities of implementing playful UI with customizable options and various offline features.
Deutsche Bahn AG - Development of a prototype for the next generation of companion app for train travellers.
optile GmbH: KPI Dashboard - KPI tracking of online payments for merchants that use optile's online payment solutions.
Every Interaction: Watchy - Composer of Apple Watch screenshots, which allows users to export the composed image and share it.
Negin Mojtahedzadeh
Last position:
Product Manager at Thieme
- Led a full platform redesign, including UX/UI, architecture, and content systems, consolidating a previously fragmented system where users were redirected across multiple sites into a single cohesive platform.
- Improved user engagement and content access efficiency, achieving 90%+ positive feedback in usability testing and increasing accessibility compliance from ~50–60% to ~85% (WCAG).
- Delivered MVP and incremental feature releases, reducing time-to-value by ~25%.
- Centralized content through a unified CMS, reducing manual updates by ~40%, saving ~80 hours/month for editorial teams.
- Conducted user research, usability testing, and analytics review to validate redesign improvements, driving early feature adoption among test users (~15–20%).
- Established Agile/Scrum workflows, enabling predictable sprint planning and improved cross-functional delivery, setting a baseline for future velocity.
Cihan Boz
Last position:
Senior iOS developer at Dewango GmbH
Developed an app for automatic safety checkins with heavily relying on AI-Tools:
Real-time Safety Monitoring - Continuous activity tracking using device motion sensors with automatic status verification through Firebase-based safety pings Emergency Contact System - Share code-based contact invitation system allowing trusted users to monitor real-time status with battery levels and last activity Background Processing - Robust Android foreground services and WorkManager integration ensuring 24/7 monitoring without interruption Smart Notifications - Firebase Cloud Messaging for instant alerts to emergency contacts Sleep Scheduling - Configurable quiet hours to prevent unnecessary alerts Premium Tier - In-app purchase system with unlimited contacts
Peter Brungs
Last position:
Data Warehouse Consultant (Development and Analysis) at Atruvia AG
- Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
- Analyzed data quality and developed test procedures
- Created PowerShell scripts and documented GIT deployment processes
- Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts
Calin Calin
Last position:
Gorillas
- Successfully migrated 99.9% of the users to the new app by automatically logging them in using the token retrieved from the old app.
- Facilitated more than 400k signups in the first 3 months after releasing the redesigned app by supporting phone, Apple, Google, and Facebook authentication methods implemented using Firebase.
- Helped more than 250k users successfully add their address by supporting search using Google Places and by selecting the exact location using Google Maps based on the service delivery zones.
- Skills: Firebase Auth, Google Places, Google Maps, Segment, Adjust, Braze, Rich Push Notifications
Mohammad Ashraf
Last position:
ParkProReakt at Justus Liebig University Giessen
- proactive instead of reactive symptom detection in Parkinson patients
- iOS development
- FHIR integration
- database structure
Anton Kolchunov
Last position:
Senior iOS Engineer at HelloFresh SE
- Spearheaded development of the Experimentation Library, starting from writing RFC towards integration and support of the feature teams
- Spiked the possibility of using Kotlin Multiplatform for Experimentation Library to share implementation with Android
- Designed, developed, and iteratively integrated a new Data Layer, which unblocked and improved the development speed of the feature teams
- Organized workshop about Swift Concurrency to improve knowledge amongst iOS engineers and became a go-to person for related questions
- Completed overhaul of the existing CI configuration to make it more maintainable by big team
- Incorporated Bash script linter to harden CI and Utils scripts for iOS project
- Spiked Tuist as an option to integrate modularized features with 500+
- Maintained tooling to identify UI Tests ownership with custom Swift CLI and native SwiftLint rule
- Provided support to other teams on uncommon architecture questions
- Actively participated in shaping development culture within the team and across the whole iOS chapter
- Used technologies: Swift, SwiftUI, Swift Concurrency, Swift Package Manager, Bash, Git, GitHub Actions, Bitrise
Fatih Karakurt
Last position:
Mobile App Developer at ING Belgium
- Part of a squad focused on intensive module development and integration
- Close collaboration with other squads and teams to integrate modules and essential components
- Use of SwiftUI and the Coordinator pattern to develop clean and understandable code
- Creative collaboration with UX designers in Figma and implementation in code
- Industry: Banking
- Project language: English
- Organizational form: Kanban
- Tools: Azure, Confluence, Figma, Teams
- Team size: 40 people
- Version control: Git, GitFlow, Azure
- App Store product: ING Banking
- Programming languages: SwiftUI, Swift
- Patterns: Coordinator, MVVM
- Swift Package Manager
- Localization: Yes
- Testing: XCTest, XCUITest
Petru Kisalita
Last position:
Architect & Technical Team Lead & Senior Developer at Goetel GmbH
- Design, architecture & development/programming of ETL/ELT data pipelines, DWH, BI solution
- Technical project lead, POC – proof-of-concept creation
- Liaison between business units and technical teams
- Azure DevOps Boards & Jira
- Data modeling & data engineering – data warehouse & data mart
- Azure (Data Factory, Azure SQL, Azure DevOps CI/CD, Azure Data Lake V2, Business Central REST API, OData API, OAuth2 tokens)
- SharePoint lists & API for ADF, Firebird DB, Postgres DB, DB2
- Power BI (Power Query), DAX, Excel PBI add-on, GIS data
- Automated ETL process monitoring/logging, performance monitoring, error monitoring – capturing & resolution
- Index performance tuning & statistics monitoring, Transact-SQL
- Data security – MFA (multi-factor authentication) & OAuth2, MS Graph, Azure networks & firewalls, gateways, roles, user groups – with read/write permissions
- Sources – Vario Bill, Camunda, Radius, Geo Database, OTRS, PAST, MS Dynamics Business Central, Azure Blob Data Lake, SharePoint lists
Discover over 15,000 top freelancers
Statistics of experts using Core Data
Aggregated from the professional profiles of matched freelancers.
Experience
17 years
Position duration
2.4 years
Positions per freelancer
11
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Healthcare
Certification focus areas
Information Technology, Business Intelligence, Product Development
Bachelor's degree or higher
86%
Master's degree or higher
64%
Doctorate
7%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
94%
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Germany using Core Data
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
Core Data for Apple apps
Core Data is Apple's object graph and persistence framework for iPhone, iPad, Mac, watchOS, and tvOS apps. It helps specialists store structured data, track changes, and keep the app state in sync with the user interface. It is common in products that need offline access, local caching, or complex relationships.
What experts deliver
- Data models and entity relationships
- Fetch requests, predicates, and sorting
- Migrations for changed schemas
- Sync logic with CloudKit or custom APIs
- Performance fixes for large local datasets
When companies bring in help
Teams usually need freelance expertise when a Core Data stack becomes slow, unstable, or hard to evolve. Common triggers are migration failures, merge conflicts, memory issues, and inconsistent saved data after new releases. In Germany, that often appears in product teams that need short-term help without adding a permanent hire.
Ecosystem and tooling
Strong specialists work comfortably with Xcode, Swift, Objective-C, NSPersistentContainer, NSManagedObjectContext, and Instruments. They understand background contexts, batch operations, faulting, and how Core Data interacts with SwiftUI or UIKit. They also know when to keep the store local and when to combine it with sync layers.
What good specialists do
Good Core Data professionals keep the data model simple, readable, and testable. They plan migrations before shipping schema changes and watch for hidden performance costs in fetch patterns and relationship traversal. They also coordinate closely with app and backend teams so local persistence does not drift from the server model.
Signs you need Core Data expertise
- Your app crashes after a model change
- Sync and offline data disagree
- Fetches are slow on real devices
- The project mixes Swift and older Objective-C code
- The team needs clean guidance for a new persistence layer
Frequently asked questions
Not sure where to start with Core Data? These answers cover the essentials.
Core Data is used to persist structured app data on Apple devices. Teams use it for offline-first flows, local caches, user state, and data models with relationships. It is especially useful when the app needs to keep working smoothly without a constant network connection.
Core Data sits above the storage layer and gives you object management, change tracking, and model-driven persistence. SQLite is lower level and more manual, while Realm offers a different object store with its own patterns. The right choice depends on whether your team wants Apple-native integration, direct SQL control, or a separate database model.
Bring in Core Data expertise when migrations fail, performance drops, or the current data layer is hard to maintain. It also helps when a new feature needs careful offline storage or when old persistence code is blocking release work. A freelancer can stabilize the stack without forcing a long ramp-up.
A strong Core Data specialist usually also knows Swift, Objective-C, Xcode, and Apple app architecture patterns. Experience with CloudKit, UIKit, SwiftUI, testing, and Instruments is often valuable too. Those skills help the person fit persistence work into the rest of the app instead of treating it in isolation.
A small read-only cache may need only targeted support, but schema migration, sync, and performance tuning need deeper Core Data knowledge. The risk is not writing the first model. The risk is changing it safely over time while protecting existing user data.
Yes. Most Core Data work can be done remotely because it lives in Xcode, app code, and test builds. On-site time only helps when the team wants close product workshops, pair sessions, or quick alignment with nearby Apple app specialists.
Look for clear model design, sensible migration plans, and a practical approach to fetch performance. A good Core Data specialist explains trade-offs in plain language and can show how they handled merge conflicts, background saves, or data repair. You want someone who protects user data first and writes maintainable code second.
Yes, Core Data is often searched as CoreData, especially in older codebases and community discussions. It is Apple's persistence framework for object graphs and local data storage. When candidates use either term naturally, they are usually talking about the same technology.
The average hourly rate of freelancers in Germany who have used Core Data in their recent projects is 95 €, which corresponds to a daily rate of about 763 € based on an 8-hour working day.
Of the freelancers in Germany who have used Core Data in their recent projects, 86% hold at least a Bachelor's degree, 64% hold at least a Master's degree, and 7% hold a doctorate.
On average, freelancers in Germany who have used Core Data in their recent projects have 17 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers in Germany who have used Core Data in their recent projects are German (94%), English (94%), and French (28%).
The most common industries among freelancers in Germany who have used Core Data in their recent projects are Information Technology (94%), Banking and Finance (56%), and Healthcare (39%).
The most common business areas among freelancers in Germany who have used Core Data in their recent projects are Information Technology (100%), Product Development (83%), and Quality Assurance (61%).
Main locations of FRATCH Experts, who have recently used Core Data
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
