Denisi Valence
Systems Engineer
I turn hard problems into production systems that stay fast, stay honest, and keep paying off.
Projects
Check out some favorite
recent production systems.
What I Build
Full scope across
backend, automation, and data
Engineering
Distributed backends and payment-grade architecture that stay readable, secure, and steady under load.
Scope
- Modular backends with module boundaries enforced by tests
- Contract-first APIs, OpenAPI schemas, and clear service edges
- Event-driven communication with idempotent handlers
- Identity, two-factor auth, and access control across products
- Double-entry ledgers and sagas that compensate on failure
- High-availability design that isolates failure and degrades gracefully
- Database design, migrations, and consistency under real load
- Caching strategies and hot-path performance tuning
- Provider integrations with retries, timeouts, and circuit breakers
- CI/CD pipelines, container deployment, and runtime hardening
- Custom metrics, dashboards, and release-tracked observability
My Services
Production systems across
backend, automation, and data
Agents that plan, call tools, and pause for human sign-off, grounded by RAG and free of vendor lock-in so they hold up in production.
Event-driven services with sagas, idempotent state machines, and clean module boundaries that stay calm under real traffic and failure.
Contract-first engines with graph scheduling, retries, and recovery checkpoints, shipped as SDKs that behave the same on every surface.
Email, WhatsApp, and SMS behind one provider contract, with delivery tracking, bots, verification, and developer APIs teams build on.
Double-entry ledgers, mobile money rails, signed receipts, risk limits, and reconciliation, built so every shilling balances.
Terraform-built environments on AWS and Oracle Cloud with containers, CI/CD, hardened runtimes, and releases you can roll back fast.
Metrics, dashboards, and release-tracked errors that show what broke and why, without logging the sensitive data you protect.
Process
From problem definition
to production systems
Delivery Flow
Discover problems, design solutions,
build safely, and operate in production.
Discover
Name the problem and what winning means
Name the problem and what winning means
Discover
Design
Draw the architecture before any code
Design
Draw the architecture before any code
Build
Build, test, and ship through staging
Build, test, and ship through staging
Build
Operate
Watch, respond, and keep improving
Operate
Watch, respond, and keep improving
Core Stack
Tools picked for how they
behave in production
Golang and Python
Fast, dependable backend services
TypeScript and Next.js
Product dashboards and SDK surfaces
FastAPI and Spring Boot
Clean APIs and JVM microservices
Docker and Kubernetes
Containerized cluster deployments
Kafka and RabbitMQ
Event streaming and async messaging
PostgreSQL and PostGIS
Ledgers, relational and spatial data
LangChain and RAG
Agent workflows and grounded retrieval
AWS and Oracle Cloud
Terraform-provisioned infrastructure
Years shipping production systems, from payment ledgers to agent runtimes
95%
Client satisfaction, earned one shipped release at a time.