Fady K.-Senior Software Developer / Tech Lead
Check rate
Experience
Senior Software Developer / Tech Lead
Specific Objects Technologies GmbH
- Project 1: Multi-Tenant SaaS Platform: Data Integration & Pricing Management
- Objective: New development of ELT pipeline (replacement for Java 6 legacy), integration of heterogeneous source systems (CSV, Excel, Email, external DBs), event-sourcing for complete auditability, multi-tenant architecture for tenant-capable data processing
- Challenge: Processing millions of records daily, audit compliance, data isolation between different tenants
- Solution: Stakeholder workshops for requirements analysis, event-driven architecture with Axon Framework and Apache Kafka, AWS services (EC2, S3, Lambda, SQS, API Gateway) for cloud integration, PostgreSQL with tenant-specific schemas for multi-tenant data isolation, REST API design with Spring Boot for external system integrations, comprehensive testing strategy (JUnit, Spring Test, Postman, PACT, ArchUnit)
- Results: ELT performance improved from 30+ min to 1-5 min; 2-3 hours daily saved through workflow automation; 10-20 hours/week saved through event-sourcing auditability; 100% audit compliance; secure multi-tenant data isolation for 10+ tenants
- Project 2: Multi-tenant CRM System Modernization
- Objective: Migration of CRM system (20+ years PHP/MySQL) to Java microservices, Domain-Driven Design implementation, establishment of Test-Driven Development, multi-tenant-capable SaaS architecture for multiple customer tenants
- Challenge: Remodeling complex business logic, no existing test culture, scalable tenant management with data isolation
- Solution: Comprehensive testing strategy (JUnit, Spring Test, Postman, PACT, ArchUnit), multi-tenant architecture with tenant-specific databases, REST API design with Spring Boot for cross-tenant integration, Kubernetes and Docker for container orchestration
- Results: 2× performance improvement; deployment time reduced from 40+ min to 5-7 min; migration without production outages; scalable multi-tenant solution for 15+ customer tenants
- Technologies: Java, Spring Boot 3.x, Angular, Apache Kafka, AWS (EC2, S3, Lambda, SQS, API Gateway), PostgreSQL, Axon Framework, Kubernetes, Docker, GitLab CI, REST API
Senior Developer
MaibornWolff GmbH
- Project 1: Deutsche Bahn Mobile Backend
- Objective: Backend for Android app (50,000+ DB employees), API design and microservices architecture, Domain-Driven Design
- Challenge: Replacement of legacy monolith (2,000,000+ lines), millisecond-range performance for 50,000+ concurrent users, high-availability PostgreSQL database architecture
- Solution: Breakdown into 7 microservices with bounded contexts, Kotlin-based microservices with Apache Kafka, PostgreSQL with optimized indexes and partitioning, REST API design for mobile connectivity, Kubernetes and Docker for container orchestration
- Results: Replacement with 7 microservices, millisecond-range performance, zero-downtime migration, 99.9% uptime for 50,000+ employees
- Project 2: Government Digitalization Portal
- Objective: Fullstack development of internet portal for public administration, backend with Java/Spring Boot, frontend with Angular, integration of various administrative backend systems
- Challenge: Integration of heterogeneous legacy systems, 24/7 high availability and load peaks, strict compliance (GDPR, BITV 2.0)
- Solution: Secure-by-design microservices architecture, REST API gateways for system integration, Kubernetes and Docker with 85% test coverage
- Results: 100,000+ transactions/month, 24/7 high availability, GDPR and BITV 2.0 compliance
- Technologies: Java, Spring Boot, Microservices, Angular, Oracle DB, Kubernetes, Docker, Helm, REST API, Terraform
Technical Lead
Qcentris GmbH
- Objective: End-to-end test automation for insurance application, test data management system
- Challenge: Legacy UI with complex business rules, manual test times of 2 weeks per release
- Solution: Java-based framework with Selenium and Page Object Pattern, Spring Boot system for test data generation, Docker for CI/CD integration
- Results: Manual test times reduced from 2 weeks to 2 days (80% reduction); 90% less manual test data work
- Technologies: Java, Spring Boot, Selenium, TestNG, Maven, TOSCA, MySQL, Docker, REST APIs
Software Developer
SKAN Deutschland GmbH
- Objective: System architecture for scientific measurement software, ML algorithms for data evaluation
- Challenge: Real-time data processing, complex scientific algorithms
- Solution: Modular architecture with Docker containerization, machine learning for data evaluation
- Results: 50% improvement in measurement accuracy, 300% productivity increase
- Technologies: Python, NumPy, Pandas, Scikit-learn, PostgreSQL, Java, Spring Boot, Docker
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Biotechnology, Transportation, Government and Administration, and Insurance.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Quality Assurance, and Research and Development.
Summary
Senior Java Developer with 5+ years of enterprise experience in rapidly modernizing complex legacy systems and building scalable cloud-native architectures. Specialist in Domain-Driven Design with proven ability to quickly understand new business domains and successfully migrate 15+ legacy services with an average 65% performance improvement.
Skills
- Backend Development - Java 8/11/17/21 & Spring Boot 2.X/3.X - Expert (5+ Years Enterprise Development)
- Frontend Development - Angular (Enterprise), React (Private Projects), Typescript
- Event-Driven Architecture - Apache Kafka, Rabbitmq, Event-Sourcing, Cqrs, Microservices
- Cloud & Devops: Docker, Kubernetes, Aws (Ec2, S3, Lambda, Sqs, Api Gateway, Cloudfront), Cloudflare, Jenkins, Github Actions, Gitlab Ci
- Clean Code & Testing: Automated Testing, Tdd, Clean Architecture
- Databases: Postgresql, Mysql, Oracle Db, Cassandra, Mongodb
- Leadership: Technical Leadership Of 5+ Developers, Scrum Teams, Stakeholder Management
Languages
Education
Martin Luther University Halle-Wittenberg
Master of Science · Biomedical Engineering · Halle (Saale), Germany · 1.4
Cairo University
Bachelor of Science · Systems Engineering · Cairo, Egypt
Certifications & licenses
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Fady is based in Berlin, Germany and can operate in on-site, hybrid, and remote work models.
Fady speaks the following languages: English (Native), German (Advanced).
Fady has at least 8 years of experience. During this time, Fady has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 2 years. Note that Fady may not have shared all experience and actually has more experience.
Based on recent experience, Fady would be well-suited for roles such as: Senior Software Developer / Tech Lead, Senior Developer, Technical Lead.
Fady's most recent position is Senior Software Developer / Tech Lead at Specific Objects Technologies GmbH.
In recent years, Fady has worked for Specific Objects Technologies GmbH and MaibornWolff GmbH.
Fady is most experienced in industries like Information Technology, Biotechnology, and Transportation. Fady also has some experience in Government and Administration and Insurance.
Fady is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Fady also has some experience in Research and Development.
Fady has recently worked in industries like Information Technology, Transportation, and Government and Administration.
Fady has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Fady holds a Master in Biomedical Engineering from Martin Luther University Halle-Wittenberg and a Bachelor in Systems Engineering from Cairo University.
Fady has 2 certificates. These include: ISTQB Certified Tester Foundation Level and Microsoft Azure Fundamentals (AZ-900).
The availability of Fady needs to be confirmed.
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Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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