Built on the anvil.
AnvilaTech is a backend engineering firm. We design and build the systems businesses actually run on — event-driven platforms, logistics and dispatch infrastructure, commerce backends, and AI pipelines wired into real products.
We work with teams who have outgrown a first implementation: the CRUD database that cannot answer what happened, the nightly sync that drifts, the integration that fails silently. The work is unglamorous and load-bearing, and it is what we do exclusively.
The philosophy is unfashionable on purpose: boring reliability over novelty, explicit architecture over clever shortcuts, and systems that outlive the people who wrote them. We optimize for the engineer who inherits the codebase two years from now.
The firm is led by Callistus Nkamuo, a software architect specializing in DDD, event sourcing, and distributed systems, and grew out of a Top Rated Plus practice with thousands of hours across logistics, commerce, and AI.
Domain first
We model the business in code. The domain leads; the framework follows.
Events as truth
What happened is the source of truth. State is a projection you can rebuild.
Tested or it doesn’t exist
If it isn’t covered, it isn’t done. Tests are the spec, not an afterthought.
Handover is the product
Runbooks, ADRs, and observability ship with the code. You own what we build.
- 2019
First systems in production
Early backend builds ship; distributed systems become the focus.
- 2020
Full-time freelance engineering
DDD and event sourcing become the method across client work.
- 2023
Top Rated Plus on Upwork
2,100+ hours logged, 100% job success, 5.0★ across logistics, commerce, and AI.
- 2025
Flagship systems shipped
Event-sourced TMS, multi-channel commerce sync, and an AI media pipeline reach production.
- 2026
AnvilaTech, LLC founded
The practice becomes a firm. Same method, more capacity.
Led by Callistus Nkamuo — software architect specializing in DDD, event sourcing, and distributed systems.