Andrea Antunović
I worked closely with Milan as a Product Manager at Xodo Sign (formerly eversign), and he is one of the rare engineers who truly operates at both strategic and executional levels.
Our platform serves hundreds of thousands of customers and processes millions of transactions across a distributed system spanning databases, caching, storage, and third-party integrations. Within that environment, Milan consistently owned high-impact architectural decisions that directly influenced platform reliability, delivery speed, scaling, and enterprise readiness.
One of his most visible product-protecting contributions was proactively designing an automated fraud protection system that identified over 3,000 fraudulent accounts and prevented millions of fraudulent emails from ever being sent. He also led our zero-downtime AWS SES migration of millions of transactional emails, achieving industry-leading delivery metrics with less than 0.2% bounce rate and less than 0.02% complaint rate.
Milan implemented several of our most critical features fully end-to-end, from requirements and architecture through security, QA, and rollout. This includes core capabilities such as Device Verification, Bulk Sending, and 2FA for document signers, all of which boosted our sales trough large customers adoption and security.
Beyond individual features, his impact at the organizational level was substantial. He introduced the enterprise architecture backbone for the product, guided the team in creating and maintaining a centralized risk repository, personally kicked off our Architectural Decision Records practice, authored over 10 core technical support processes, established real-time alerting with a guard duty rotation, and introduced structured Post Mortems and formal requirements engineering frameworks. These changes brought long-term clarity, consistency, and operational discipline across teams.
What consistently set Milan apart was his ability to translate product needs into concrete product and system needs without losing either the business objective or the technical integrity. He challenged unclear requirements early, exposed hidden risks before they became expensive, and helped turn ambiguous product ideas into stable, scalable systems teams could actually deliver.
He leads through clarity and technical credibility rather than hierarchy. Senior engineers regularly involved him in complex technical decisions, and architectural discussions became more structured and outcome-driven with his involvement. As a result, platform decisions were made with greater confidence and follow-through.
Milan operates at true Principal level across systems, product, and execution, and carries the decision-making maturity of a Head of Engineering. I would trust him without hesitation with the technical direction of a critical product line or platform.
Andrea, Product Owner at Apryse (Xodo Sign)