# Software architecture that stays predictable under load and bad input

I help companies design and review software architecture for products that have to keep running. The work is not a framework catalogue. It is the set of boundaries, contracts, and operational paths that stay predictable under load, invalid input, and provider failure. I am typically asked in when a SaaS is about to scale, when a rewrite is being debated, when AI is about to enter a deterministic system, or when the current shape of the software is slowing every change. You get a senior architect who still implements: the review is useless if it cannot survive contact with the repository and the traffic.

## Who this is for
- CTOs and founding engineers who need a second senior mind on a scaling product.
- Teams about to commit to a rewrite, a microservice split, or an event backbone.
- Companies placing an LLM next to a system that is currently rules and CRUD.
- Engineering leaders preparing a technical due-diligence conversation.

## What I evaluate in an architecture review
A useful review is a series of questions you can fail. These are the ones I start with.
### Constraint
Which metric or failure is actually expensive — lead time, incident rate, cost, correctness, or a date? Architecture that does not name this is taste.

### Change shape
Where do changes concentrate? If every request touches the same module, splitting services will not help until that module is decomposed.

### Contracts
Are boundaries typed and versioned, or are they 'we will be careful'? AI outputs need contracts more than human-written JSON does.

### Failure
What happens when the provider, the queue, or the model is wrong? If the answer is 'the user retries', you do not have a design.

### Operability
Can a new engineer find the path from HTTP to data in an afternoon? If not, the diagram is lying.

### Team fit
An architecture that needs a platform team you do not have is a future outage. I will not recommend Kafka because it is on a slide.


Canonical: https://ihar-ivaniuk.com/en/services/software-architecture