I build the systems
behind trust.
Ten years building backend systems. Today, my focus is identity for humans and AI agents, reliable infrastructure on AWS, and tools that make engineering a little easier.
PROJECTS
Useful tools, from the desktop to the infrastructure underneath it.
Make the invisible
observable.
Distributed tracing for Dart on AWS. I built this package to trace HTTP and AWS SDK calls, propagate trace context, and put Lambda invocations into a trace tree you can actually follow.
Dart · AWS X-Ray · Lambda · MIT
Published on pub.dev · verified publisher
dart pub add aws_xray_sdkFIELD NOTES
Implementation details, tradeoffs, and the parts the docs skip.
From black box to full trace tree: instrumenting a Dart Lambda with aws_xray_sdk, and the two silent Lambda traps that make it harder than it should be.
Dart isn't on Lambda's runtime list, but a compiled Dart binary runs there just fine. A walkthrough: custom runtime, Docker image, CDK deploy.
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ABOUT
Engineering that earns trust through the details.
I care about what happens after a system ships.
The identities it protects. The failures it handles. The engineers who have to maintain it.
More about my experienceVerifiable credentials, OID4VP, OID4VCI, and the delegation models that let agents act on someone’s behalf.
Cloud-native services on AWS, distributed systems, observability, and safe execution environments for agents.
System design across product, infrastructure, and security. Mentoring engineers to own architecture as well as implementation.
TypeScript / Node.js / Dart / AWS / CDK / DynamoDB / Docker / OAuth 2.0 / OIDC
CONNECT
Identity, backend systems, or something you’re building in the open. Always happy to exchange ideas.
mohamed@mabdelsamei.com