Callistus Nkamuo
Softwarearchitect — gedistribueerde systemen, DDD, event sourcing.
open voor consultancy·LAGOS / REMOTE · UTC+1
Ik ontwerp en lever event-driven systemen in PHP/Symfony en Go. Ik breng domain-driven design en event sourcing naar teams die met echte deadlines werken, en laat een resultaat achter dat leesbaar genoeg is om over te dragen. AnvilaTech heb ik opgericht om dat werk op schaal te doen.
Founder & Principal Architect · AnvilaTech, LLC
2023 — now- Founded an engineering firm delivering event-driven systems for logistics and fintech clients.
- Set the technical direction, hiring bar, and delivery practices across every engagement.
- Ship production systems in PHP/Symfony and Go with event sourcing at the core.
Independent Software Architect · Independent / Upwork
2018 — nowTop Rated Plus100% JSS2,148+ hours5.0★
- Designed and delivered distributed systems for clients across logistics, payments, and SaaS.
- Introduced domain-driven design and event sourcing to teams shipping under real deadlines.
- Led migrations from anemic CRUD monoliths to bounded, replayable architectures.
Senior Backend Engineer · TODO — prior engagement
2015 — 2018- TODO — owner to supply: scope, systems, and measurable outcomes.
- Built high-throughput services and mentored engineers on domain modeling.
Append-only order ledger for a logistics platform → cut reconciliation incidents to near zero
Saga-based fulfillment orchestration → replaced a brittle distributed monolith
Anti-corruption layer over a legacy billing core → let a new context ship independently
Go ingestion service beside a Symfony monolith → absorbed 12× traffic spikes
Grounded AI support assistant → deflected routine tickets without hallucinating policy
Languages
PHPGoJavaTypeScriptSQL
Frameworks
SymfonySpringDoctrineReact
Infrastructure
PostgreSQLKafkaRedisDockerKubernetesAWS
Practices
Domain-driven designEvent sourcing / CQRSSagasTestingObservability