Engineering
I design and build production-oriented systems with clear boundaries, reliable data flows and practical operational visibility.
Core capabilities
Six areas where I take technical ownership from design through to production.
01
REST APIs, service boundaries, domain logic, validation, authentication and integrations.
02
Payment flows, webhooks, user identity, permissions and failure handling.
03
Reliable asynchronous processing, retries, dead-letter workflows and workers.
04
Systems for operations, support, reporting, administration and workflow control.
05
Product interfaces connected to real backend logic, not only static frontend screens.
06
External providers, messaging platforms, CRMs, billing systems and internal services.
Selected architecture problems
These are the problems I have actually had to answer, and how I answer them. They are also the reason I write my own tools.
Problem 01
The payment provider stops answering in the middle of a charge. Did the customer pay or not? Retry blindly and you may charge them twice; give up and you may lose the payment. I build the system so every payment attempt carries a unique key: if the same request comes in again, it gets the first result back instead of creating a second charge. Balances are calculated from the full history of transactions, so a retry can never double them.
Problem 02
Payment providers and other services confirm events with automatic notifications (webhooks). In practice those arrive twice, in the wrong order or hours late, and the sender considers that normal. So the system never trusts a notification on arrival: it checks who sent it, saves it, filters out duplicates and only then acts on it. Its own outgoing notifications retry a limited number of times and then land in a review queue instead of hammering the receiver forever.
Problem 03
When responsibilities are not clearly divided, every change starts breaking something in an unrelated place, and eventually nothing can be updated safely. My rule is simple. The entry point of the system only checks and routes requests. Every business decision lives in the one part that owns the relevant data. If two parts fight over the same data, the split is wrong, and I fix the split.
Problem 04
An update can be pushed to the receiver instantly, but if the receiver happens to be down at that moment, it is gone. So I save every event first and deliver it second. The saved record is the source of truth: delivery can be retried, and anything that was missed can be sent again later. This is exactly how AlertLoop works.
Problem 05
When something fails in the middle of the night, a log line that just says "error" helps nobody. I record every step of a request under one shared id, so the whole story can be read from start to finish instead of being pieced together from fragments. And when an external service goes down, it switches off one feature, not the whole product.
The pattern
The happy path is the easy part. What separates a demo from a product is what happens on the second attempt, the duplicate delivery and the provider that stops answering.
Technical focus
I'm not tied to one stack. These are the tools I reach for by default, because I know how they behave under load and how they fail. But the system's boundaries matter more than the language it's written in.
Observability
Most production incidents are not hard because the bug is subtle. They are hard because nobody can see what happened. Logs are scattered, the delivery that failed left no trace, and the only evidence is a customer saying it didn't work.
I got tired of rebuilding the same two pieces on every project, so I published them. Traceloom connects related events into one readable timeline grouped by trace. AlertLoop makes sure the events that matter actually reach a human, with retries, dead letters and replay when they don't.
Both are open source and both are running code, not slideware. They are the clearest evidence I can offer of how I build.
Describe the system, the constraint and what is currently breaking. I'll tell you what I would do first and whether I'm the right person to do it.