Cleanup work always loses to feature work.
Each new feature takes longer than the last.
B2B SaaS Technical Debt Paydown
Pay down technical debt
Refactors, test coverage, and dependency upgrades. Delivered alongside your roadmap.
Build with us
Tech debt wins
by default
ProblemImplication
Test coverage gaps make every change risky.
More bugs reach production, more hotfixes follow.
Outdated dependencies pile up into security and compatibility risk.
Upgrades become urgent instead of planned.
What we pay down
Concrete debt categories, shipped as reviewed PRs.
Refactors and re-architecture
Untangle hot files, extract shared logic, replace risky patterns. Behaviour preserved, tests added.
Test coverage backfill
Critical paths get test suites. Releases stop relying on luck.
Working with Donux enabled us to iterate much faster, and as a result, we increased the adoption of a key product feature from 17% to 66%.
Mario CTO @ 4Dem
How debt paydown works in 3 steps
From audit to merged refactors, in parallel with feature work.
Codebase audit
We index your repo and surface the debt that's actually slowing you down. Hot files, low coverage, brittle integrations, outdated deps.
Agents refactor, seniors review
Managed agents do the mechanical work. Senior developers review behaviour preservation, tests, and architecture before anything reaches your branch.
Ship and track
Book a Discovery CallDebt lands as small, reviewable PRs. Approved changes merge to your branch. You see coverage, complexity, and dependency freshness bend in the right direction.
What you get
A measurable, parallel paydown of the debt slowing you down.
Senior human review on every change before it reaches your branch.
Reviewed PRs that preserve behaviour and add tests.
Pay-as-you-ship pricing.
Every change lands in your repo. You own the code.
Before you start.
Who is this for?
B2B SaaS CTOs and founders who feel each new feature takes longer than the last. Teams that don't want to freeze the roadmap to clean up the codebase.
How do you avoid breaking things during refactors?
Behaviour-preserving changes only. Tests added before risky changes. Senior review on architecture and edge cases. Small PRs that are easy to revert.
Will this slow down our feature shipping?
No. We work in parallel. Your team keeps shipping features while we pay down the debt backlog.
What if we don't know what our debt is?
We start with an audit. Hot files, coverage gaps, dependency drift, and complexity hotspots surface the work that's actually slowing you down.
Can you handle large dependency upgrades?
Yes. Framework migrations, runtime upgrades, and library swaps. Done incrementally with smoke tests on every step, not as one giant PR.
How does pay-as-you-ship pricing work?
You're billed per merged PR, scoped before each batch. If a refactor doesn't pass review or doesn't land, you don't pay for it. No retainer, no hourly billing.
How do you access our codebase?
Read access only by default. We work in a sandboxed environment. NDAs and access scopes are agreed before the audit. Your code never leaves the boundary we agree on.
Is our code being fed to public AI models?
No. The managed agents run on enterprise infrastructure with zero data retention. Your code isn't used to train any model. Senior developers review every change before it reaches your branch.
How is this different from a traditional agency?
Agencies bill hours whether or not the work ships. We bill only for code that lands in your repo. If a refactor doesn't make it through review, you don't pay for it.
Who owns the code?
You do. The code lives in your repo from the moment it ships. No lock-in, no licensing strings.
What if we already have an in-house dev team?
We work alongside them. Your team keeps ownership of the high-judgement calls. We absorb the debt backlog that keeps slipping. Reviews and merges stay with you.
Can I pay down debt through Magic Team?
Yes! Magic Team is a managed team of AI agents and senior humans that ships real code. Connect your repo and get refactors, test coverage, and dependency upgrades delivered as PRs, reviewed by Donux senior developers.
See the work.
Selected product design projects. Explore the challenge, the decisions and the results behind each one.
