Yassin Hajaj

The eProcurement platform of BOSA is the Belgian federal system streamlining public procurement — providing an efficient, transparent, and accessible way for businesses and government entities to engage with public tenders.

• Led and executed data migration from the old eProcurement platform, ensuring seamless transition and data integrity
• Implemented robust document encryption and storage processes, improving security and compliance
• Managed Elasticsearch operations, optimizing search functionality and user experience
• Conducted load and performance testing, identifying and resolving bottlenecks
• Tuned JVM performance for optimal efficiency and response times
• Developed and maintained monitoring and alerting systems for high availability
• Managed database concerns, ensuring data accuracy, efficiency, and scalability

Overseeing and coordinating the evaluation process for adult education students' final IT management projects.

• Ensuring fairness and transparency in jury deliberations
• Reviewing projects for technical relevance, management quality, and innovation
• Assessing students' ability to apply IT management skills to real-world situations
• Providing constructive feedback to support students' professional development

Within the Carex team (compulsory insurance dept.), working on systems interfacing with the MyCareNet platform used by healthcare providers — managing ~15 applications.

• Helped the team mature in Scrum adoption and broadened agile perspective beyond Scrum
• Coached developers on new engineering techniques and methods
• Drove improvements at department and company level
• Automated testing and releases; supported migration to private cloud

DKV is a specialist in private health insurance in Belgium.

• Designed and developed solutions aligned with best practices and company standards; practiced pair programming
• Led engineering improvements through specialised communities; introduced ArchUnit, mutation testing, and automated testing
• As Scrum Master: raised sprint achievement from below 50% to an average of 80%
• Introduced Definition of Done at company level, impediment board, and example mapping
• Spread Scrum and Agile knowledge across the organisation

Worked across multiple projects including member mutation handling (MaMut), member services (CMDV / Solimut), press department systems, and insurance handling (Assur2020).

• Low-level functional, architectural, and technical analysis
• DevOps configuration and application development
• Quality assurance, automated testing and reporting
• Functional testing and release coordination

• Managed deliveries across acceptance environments before production
• Coordinated DBA and system engineering teams during releases
• Configured new applications: servers, batches, WLST, datasources
• Monitored automated pipeline releases using Jenkins Groovy Pipelines

Refac — the CM system for processing nurse invoicing in the third-party payment scheme. Provided corrective and evolutive maintenance with high quality standards.

Baeldung is a leading platform for Java and Spring tutorials. Produced technical articles published on baeldung.com/author/yassin-hajaj.

• Scala Pattern Matching
• Introduction to Supervised Learning in Kotlin
• Introduction to Supervised, Semi-supervised, Unsupervised and Reinforcement Learning
• Parsing an XML File Using SAX Parser
• Java Application Remote Debugging

Belgian leader in consumer credit.

• Consistently achieved inbound, outbound, and insurance sales quota goals
• Helped the department achieve record results in 2014
• Designed and delivered training courses on inbound, outbound, and agency sales
• Automated departmental processes using VBA and Excel, saving time and reducing errors