Logic in the wrong place
Rules smeared across controllers and components cannot be tested. We give them a home and a type.
Application Design
Applications shaped by the model, not the framework.
Frameworks rotate every few years; your domain does not. Nusear designs applications where the mathematical and business core stands alone — tested directly, and wrapped in frameworks that can be replaced without surgery.
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The core isFramework-freeplain code with tests, behind interfaces the UI and APIs consume.
Application Design
What a designed application looks like
The domain core holds the rules and the mathematics as plain, directly testable code. Everything else — HTTP, queues, databases, UI — is an adapter at the edge. Swapping an edge never touches the core.
- Domain core design: entities, rules, and workflows
- State machines for processes, with explicit transitions
- API contracts with versioned semantics
- Error semantics: which failures retry, which fail loud
- Property-based test suites for the core logic
- UI architecture that keeps state honest
- Legacy-rewrite strangulation plans
- Performance budgets verified in CI
The Essentials
Why applications resist change
Framework gravity
When the framework is the architecture, every upgrade is a migration. The core should not care.
State without a model
Ad-hoc boolean flags become state machines no one can enumerate. We make states and transitions explicit.
Tests that test nothing
Mock-heavy suites certify the mocks. Property-based tests on the core certify the logic.
Our Role
How an engagement runs
- We extract the domain rules from code, tickets, and people.
- We design the core and its interfaces.
- We rebuild incrementally alongside the running system.
- We prove behavior with property-based tests.
- We train your team on the design as we hand it over.
Common Questions
Application design, answered
Still unsure? A Nusear specialist will walk you through it, no cost and no pressure.
Ask a SpecialistRewrite or refactor?
Almost never a big-bang rewrite. We strangle the legacy system: carve out the core, route new work through it, retire the old edges as they empty.
Which frameworks do you use?
Yours. Our job is the design; the framework is a detail we adopt rather than impose.
Can you rescue a stalled internal rebuild?
Yes. We assess what exists, salvage the sound parts, and reset the design around a testable core.
Ready when you are.
Client Notes
What people say about the work.
Draft quotations from the kinds of teams we work with. Replace with real client voices during content review.
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VP Engineering, national logistics platform
Nusear replaced a 40-minute batch job with an algorithm that finishes in 90 seconds. They showed us the proof before they showed us the code.
Head of Data, healthcare analytics firm
They modeled a domain we had been mis-modeling for six years. The migration plan alone paid for the engagement.
CTO, industrial manufacturer
The first consultants who ever told us not to build something. Their simulation said the idea would fail. It would have.
Director of Platform, financial services
The architecture review found two correctness bugs that money was quietly leaking through. Both are now invariants enforced by the database.
Founder, ML startup
They took our notebook prototype to a designed application with a tested mathematical core. Our engineers still work from their specification.
Chief Actuary, insurance group
Our model is finally written down as mathematics instead of spreadsheet folklore. The auditors noticed immediately.
