Technology consulting & engineering
Software systems you can trust
Rain Commercial designs and builds software for data integrity, security, and reliability. A small senior team, working directly with you.
What we do
Four things, done properly. We take on the parts of a system where being wrong is expensive.
Data integrity engineering
Systems that record every change and let anyone check it. Audit trails, provenance, and reconciliation you can verify independently.
- Tamper-evident audit logs
- End-to-end data verification
- Provenance and lineage tracking
- Automated reconciliation
Security engineering
Security built into the design, not added at the end. Threat modelling, review, and secure delivery.
- Threat modelling and architecture review
- Independent code review
- Access control and key management
- Secure build and deployment
Reliable systems
Software that runs predictably and stays up. Resilient architecture, thorough testing, and monitoring that tells you what is happening.
- Resilient, fault-tolerant design
- Automated testing and simulation
- Observability and monitoring
- Performance engineering
Development and integration
Building the systems you need and connecting them to the ones you already run.
- Bespoke application development
- Systems and data integration
- Process automation
- API and data pipeline engineering
Why work with us
We are a small engineering team that takes on work others treat as too detailed to get right.
You work with the engineers
Senior people do the work. No handoff to junior staff, no layer of account managers between you and the build.
Depth in hard systems
We work where state has to stay consistent and correct across many moving parts, not just on the surface.
Built to keep
Systems are designed to be run and maintained for years, with documentation and tests to match.
Plain answers
We tell you what is and is not worth building, including the times when the honest answer is less software.
Independent verification
We design so your own team, or an auditor, can check the system behaves as intended without taking our word for it.
Working software
You get running systems and a clean handover, not a report that sits on a shelf.
How we work
A method that keeps correctness and reliability measurable rather than assumed.
Specify, then build
Requirements and interfaces are agreed and reviewed before implementation starts, so everyone knows what correct means.
Test against the specification
Automated tests check the system does what was agreed, and they run on every change, not just at the end.
Make failure observable
Where something can go wrong, it is monitored and recoverable rather than silent, so problems surface early.
The team
The people you will actually be working with.
Designs Rain Commercial's core infrastructure. Long background in distributed systems, protocol design, and low-level systems programming.
Leads technical implementation and platform delivery, with a focus on security and performance across production systems.
Leads client engagements and delivery. Background spanning product leadership, distributed systems, and complex system design across several venture-backed companies.
Start a conversation
Tell us what you are building, or what needs to be more reliable. We will tell you honestly whether we can help.
Email the team