An expert reads the code that touches your customers’ money.
Automated scanners check for known mistakes in known places. We read the parts that matter — logins, payments, permissions, and anywhere customer data moves — and find the logic flaws no tool can see. Every issue comes with a working fix, not a warning to look into later.
The worst bugs aren’t mistakes. They’re decisions that made sense at the time.
Automated tools are good at spotting careless code: the outdated library, the password left in a file, the query built the unsafe way. Keep them running — they're cheap and they work. But they have no idea what your software is supposed to do, so they can't tell you that a customer can change one number in a request and read another customer's invoices, that a refund can be claimed twice, or that the password reset link never actually expires.
Those aren't typos. They're reasonable decisions made under deadline, in code that works perfectly for honest users. Finding them takes a person who reads the code the way an attacker would, asking what happens if someone lies at every step. We focus on the small percentage of your codebase where the damage lives — authentication, payments, permissions, uploads, integrations — and we write the fix ourselves, so your team gets a pull request to review rather than a problem to research.
What we look at.
Logins and sessions
Sign-up, sign-in, password reset, two-step login, and staying logged in. We check that a session really ends when someone logs out, that reset links expire, and that nobody can log in as someone else.
Who can see what
The most common serious flaw we find, by a distance: a logged-in customer changing an ID in a request and seeing another customer's data. We test every user role against every sensitive screen.
Payments and money movement
Checkout, subscriptions, refunds, credits, and discount codes. We look for prices that can be edited in the browser, refunds that can be claimed twice, and payment confirmations that can be faked.
Customer data handling
Where personal data is stored, how it's encrypted, who can export it, and whether it quietly leaks into logs, error messages, or third-party analytics tools.
File uploads and integrations
Uploads are a classic way in. We check what your system accepts, where it stores it, and whether the connections to your payment provider, CRM, and partners can be tricked or replayed.
Secrets and keys
We hunt through your code history for passwords, keys, and tokens that were committed and then 'removed' — they're still there, and they're still valid until someone rotates them.
The libraries you depend on
Your software is mostly other people's code. We check what's outdated, what's known to be vulnerable, and which upgrades are urgent versus which can wait for the next quarter.
A fix for every single finding
You don't get a list of problems. You get a prioritised report plus, where you want it, the actual code change ready for your team to review and merge.
When to book one.
Before a payments or login rewrite goes live
The two areas where a mistake costs real money on day one. A review the week before launch is the cheapest insurance you'll ever buy.
When you inherited the code
An agency handed the project over, a contractor left, or you acquired the product. A review tells you what you actually own before you build on top of it.
As part of due diligence
Buying a company, or being bought. We tell the buyer what's really under the hood, in language a non-technical board can act on.
When compliance asks for it
SOC 2, ISO 27001, PCI DSS, and HIPAA all expect evidence that your code is reviewed for security. This produces exactly the documentation an auditor wants.
How we review.
Understand the business
Before we read a line of code, we ask what would hurt most: money moving the wrong way, customer data leaking, or someone taking over an account. That answer decides where we spend our time.
Map the risky parts
We trace how data flows through your system and mark the doorways — anywhere untrusted input arrives, anywhere permissions are decided, anywhere money or personal data is touched. That's typically 10% of the code and 90% of the risk.
Automate the boring half
We run Semgrep, Snyk, and CodeQL across everything, then throw out the false alarms ourselves. You never see a finding we haven't personally confirmed is real.
Read it properly
The core of the work. A senior engineer reads the sensitive code line by line, asking what breaks if the user lies, retries, goes backwards, or sends two requests at once. Anything critical reaches you the same day.
Prove it and fix it
For serious findings we demonstrate the problem on a safe copy so there's no argument about severity — then we write the fix as a pull request your team reviews and merges.
Hand over and level up
A walkthrough call with your developers, a written report, and a short checklist they can use on their own code from then on. The goal is fewer findings next time, not repeat business.
Engagement models.
Focused Review
from $9k
One critical area read end to end — usually logins and permissions, or the payment flow. The fastest way to get certainty about the part that matters most.
- One critical area, read line by line
- Automated scan with false alarms removed
- Report plus a walkthrough with your developers
- A suggested fix for every finding
Full Codebase Review
from $24k
Your whole application: logins, permissions, payments, data handling, uploads, integrations, and dependencies — with fixes delivered as pull requests.
- Every sensitive area covered
- Fixes delivered as pull requests
- Secrets swept from your full code history
- Free re-review of the fixes within 60 days
Embedded Reviewer
custom
A security engineer inside your development process every month, reviewing changes as they're written instead of long after they shipped.
- Ongoing review of your team's changes
- Security checks built into your release process
- Developer training and secure coding guidelines
- Evidence ready for SOC 2 and ISO 27001 audits
Frequently asked.
5 questions answered. Still have one? Reach out.
Yes, for this service — reading the code is the whole point. We work under a strict confidentiality agreement, use your own systems and accounts wherever you prefer, take only the access we need, and delete everything when we're finished. We're happy to sign your paperwork rather than ours.