Backend Development
Robust APIs and services — REST, gRPC, GraphQL — built for correctness, performance and maintainability.
Backend engineering · Netherlands · Remote-friendly
Backend systems that scale, ship, and stay up.
Sinmux builds reliable APIs, data platforms and cloud infrastructure for teams that need senior backend engineering — on contract, by the project, or freelance.
Available for new work
// Services
What I do
Senior backend engineering, end to end.
Cloud & DevOps
Infrastructure-as-code, CI/CD pipelines, containers and observability on AWS and GCP. Ship safely and often.
System Architecture
Designing scalable, fault-tolerant systems. Monolith-to-microservices, event-driven design, and technical strategy.
Full-stack & Integrations
End-to-end features, third-party API integrations and data pipelines that connect your systems together.
// Work
Selected work
A sample of systems I’ve designed and built.
99.99% uptime · <50ms p99
High-throughput Payments API
Role: Lead Backend Engineer
Designed and built a payment processing service handling millions of transactions per day with idempotent, fault-tolerant request handling.
10B+ events/month processed
Event-driven Data Platform
Role: Backend / Data Engineer
Architected a streaming pipeline ingesting and transforming high-volume event data for real-time analytics and reporting.
Deploy time 2h → 8min
Microservices Modernization
Role: Software Architect
Decomposed a legacy monolith into independently deployable services, cutting deploy times and unblocking team autonomy.
30+ integrations unified
Third-party Integration Layer
Role: Full-stack Engineer
Built a resilient integration gateway unifying dozens of external APIs behind a single, well-documented internal contract.
// Stack
Stack
Tools I reach for to get backend systems into production.
Languages
- Go
- Python
- TypeScript
- Java
- Kotlin
Backend
- Node.js
- FastAPI
- Spring Boot
- gRPC
- GraphQL
- REST
Data
- PostgreSQL
- Redis
- Kafka
- Elasticsearch
- MongoDB
Cloud / DevOps
- AWS
- GCP
- Docker
- Kubernetes
- Terraform
- CI/CD
// About
About Sinmux
Sinmux is the backend engineering practice of a senior software engineer based in the Netherlands. The focus is simple: design and build server-side systems that are correct, observable, and fast — and that keep working under real-world load.
After years building and operating production backends, I now take on contract, project and freelance work for teams that need an experienced pair of hands on the hard parts: API design, data modelling, performance, and cloud infrastructure.
Pragmatic, communicative, and outcome-driven — I plug into your team or run a piece of work independently, whatever fits.
10+ yrs
Backend experience
NL
Based, remote-friendly
EN / NL
Working languages
// Contact
Let’s build something
Have a backend project, a contract role, or an architecture problem to solve? Tell me about it.