WISSEM BELGUIDOUM

As a Senior Backend Developer on the user-facing team, I led the architecture of critical B2B features, from the core multitenant identity service to real-time automotive partner integrations:

• Unblocked the B2B sales pipeline by delivering a multitenant identity service. This involved customizing the Ory stack to support isolated tenant configurations for corporate SSO (OpenID Connect).
• Built and owned a scalable, cross-team and event-driven push and email notification service using SQS, AWS Lambda, Firebase Cloud Messaging and Sendgrid. This asynchronous pattern ensured reliable delivery and provided a standard interface for all teams.
• Engineered a real-time driver safety feature with automotive partner Continental. The system ingested driver attention scores from an MQTT stream and pushed in-app safety commands (e.g., 'lower volume') via our central push notification service.
• Proactively initiated and led the architecture for a new workflow engine, selecting Cadence to solve a core content automation problem. The successful PoC, which modeled a complex AI + human-in-the-loop pipeline, was formally adopted by the Content Management team for production use.
• Ensured production readiness and maintainability by implementing high engineering standards, including near 100% test coverage (unit & E2E), comprehensive documentation (OpenAPI and AsyncAPI), and a full observability stack (Datadog tracing, metrics, logging).

In this freelance engagement, I designed and built an event-driven trading platform from scratch, using Golang, Kafka, and microservices:

• Architected the order reception pipeline to decouple synchronous validation from asynchronous processing: a service handled validation against external bank APIs, while Kafka was used for the asynchronous handoff to the matching engine.
• Implemented the order matching engine, which consumed from a Kafka topic to process and match buy/sell orders based on complex, client-defined business rules.
• Containerized all services using Docker and utilized PostgreSQL for persistent state management.

Grew from a Senior Java Developer to a Technical Leader, owning the bank's mission-critical Electronic Document Management System (EDMS) which served 2 million users. I led a team of 4 developers in all new development, production support, and a massive-scale migration.

• Designed and developed multiple new, large-scale Java services, including a document deletion management service, a restful connector to Banctec (physical document archive and scanning partner), and an AI/OCR processing pipeline (RADLAD).
• Introduced Golang to the team by building high-value CLI utilities. Most notably, developed a complete Banctec simulator that unblocked the Workflow team's end-to-end testing in QA environments.
• Evolved into the team's Technical Leader. I mentored 4 junior developers, managed task delegation, and was responsible for all code reviews and production support for services handling 100k new documents per day.
• Architected and led the migration of the core EDMS (100+ TB, 400+ millions of documents) from Opentext to an in-house Big Data platform (HBase/HDFS), saving the bank over €600,000 in annual licensing costs.

As a fullstack developer, I was hired to build an e-learning platform from the ground up on Google's cloud platform:

• Designed and built a full-stack J ava application on Google AppEngine, utilizing GWT and Google Data Store (NoSQL).
• Implemented social authentication for the platform using OpenID and Facebook Connect.

As a key developer in a 5-year role, I grew to take on architectural design, UI modernization, and full-stack development for the company's core AdTech and marketing optimization products.

• Developed multiple full-stack Java applications using Spring, Hibernate, and Struts, including a JFreeChart-based reporting dashboard and a WYSIWYG questionnaire editor.
• Led the UI modernization of the 'Probance Hyper Marketing' platform by migrating the admin panel from Struts 2 to GWT 2.0, while simultaneously building new REST and SOAP clients to integrate 3rd-party email and tracking partners.
• Designed and implemented Probance's new web-tracking solution, which processed over 400k events per day in production, and ensured its reliability with JMeter performance testing and JMX monitoring.
• Led the analysis and replacement of the 3rd-party Kxen data mining engine, migrating all its operations to a new in-house solution.
• Directly supported the sales team by building a GWT-based 'demo generator' that automated the complex setup and deployment of product demos for prospective clients.