For UK SaaS, fintech, and regulated teams. STRIDE, PASTA and Trike, attack-tree analysis, dataflow diagrams, and mitigation ranked by what an attacker reaches first — left with a model your CISO and your auditor both sign.
A threat model isn’t a PDF you file before an audit. It’s the map of where an attacker walks first, ranked, mitigated, and re-run every quarter as your system changes.
“The threat model and ADR pack were the documents that got our acquirer’s CTO to sign retention. He walked the surface and stopped asking us for things.”
Threat-modelling engagements since 2020, STRIDE and PASTA.
Production incidents on shipped security engagements.
Fixed-scope audit, £8K, 30-page brief, six ADRs, fixed quote.
The in-house attempt was two engineers part-time, no observability, no audit log, and a Confluence page with the runbook. The acquirer’s CTO walked the surface pre-LOI and said one thing: “rip and replace, or a 25% diligence haircut.” The deal stalled on a missing threat model.
We rebuilt the security posture over 10 to 14 weeks. Senior engineers paired daily. STRIDE and attack-tree analysis ran against the real dataflow. Every decision landed in an ADR the same day. The evidence pipeline was wired from day one, not bolted on for the audit.
The acquirer’s CTO came back to the diligence call, walked the same surface, and signed retention. Full team kept. Deal closed at ask. This page is for the founder or CTO who decided security is a build problem, not a paperwork problem.
Every founder who emails us about threat modelling services is fighting one of these eight things. Each one is a single architectural decision you can defend on a diligence call.
“A workflow died silently. Our customer found out before we did.”
Per-workflow observability and alerts. PagerDuty plus Slack on every critical path. The on-call engineer reads the trace and knows what happened in sixty seconds. Your customer never finds out first.
“Who did what, when? No record. The SOC 2 auditor flagged it.”
Append-only audit log on every mutation. Actor, tenant, IP, timestamp, before and after. Tenant-admin viewable, exportable, searchable. The auditor stops asking and starts ticking.
“An enterprise prospect asked for SOC 2, a DPA, and a sub-processor list. We had none.”
Procurement pack ready on day one. SIG-Lite plus CAIQ plus DPA plus SCCs plus a SOC 2 stance shipped from the start. Vendor security review clears in days, not the quarter you don’t have.
“The backup runs. The restore has never been tested. A disaster would be career-ending.”
Restore rehearsed quarterly. A DR drill on the calendar. RTO and RPO documented and tested. Restore in under four hours, proven, not assumed.
“One engineer holds the whole security model in their head. Bus factor: one.”
Two seniors paired, ADRs same day. Two senior engineers on every engagement, every decision written down the day it’s made. The model lives in the repo, not in one person’s memory.
“The ICO, FCA, or SRA asked for a record and we couldn’t produce it inside 30 days.”
DSAR runbook plus audit export. A documented DSAR runbook and a one-click audit log export. The 30-day deadline becomes a process, not a panic.
“The acquirer’s CTO flagged our ad-hoc security posture and the offer is on hold.”
A threat model the diligence team reads. Dataflow diagrams, STRIDE pass, attack trees, and ADRs are the documents they ask for. Three 2024-25 clients passed acquirer reviews on the first walkthrough.
“We paid for a threat model last year. The architecture moved on and the model didn’t.”
The model wired into design reviews. When a boundary changes, the threats update in the same pull request. A living model your team re-runs quarterly, not a PDF that aged the day it shipped.
Threat modelling gets bought as a tick-box by everyone who hasn’t lost a deal to a missing model. It gets built as a discipline by the people who have. Here’s what built looks like.
The engineers who sign your scope are the engineers who run the STRIDE pass and write the ADRs. Names on the SOW are names on the commits. No staff aug, no day-rate, no rebuild upsell.
Every decision in an ADR, every mitigation tied to a finding, every finding tied to a boundary. Your CISO, your acquirer’s CTO, and your auditor all defendable on the same call.
We wire the model into your design reviews so the next pass is something your team runs without us. A threat model that goes stale the week after handover isn’t a model, it’s a receipt.
A £8K five-day audit, then a fixed-price sprint quoted at audit end. No scope creep. 30-day walk-away both ways. IP assigns on commit. No deposit forfeiture.
Fourteen threat-modelling engagements have stress-tested these picks. Tier 1 runs every engagement. Tier 2 is what we reach for when the brief needs it. Tier 3 scales the evidence pipeline to enterprise without a rebuild.
Every engagement leaves the same six artefacts, each one a question your CISO or your auditor stops asking. Not a PDF you file once.
Trust boundaries, data stores, processes, and every external entity that touches your data. Drawn from the code, not the architecture deck from two years ago.
Spoofing, tampering, repudiation, information disclosure, denial of service, elevation of privilege. Applied to each trust boundary, not waved at the system as a whole.
For the data that ends your company if it leaks, we map every path an attacker walks to reach it. PASTA where the business context needs it. Ranked by reachability, not by gut feel.
Findings ranked by impact times reachability, each with a concrete fix, an owner, and an effort estimate. Your team ships the top of the list first and can defend the order.
Every meaningful security decision in an architecture decision record. SOC 2 and DPA evidence-ready. The acquirer’s CTO walks the surface and signs, three times in 2024-25.
The model is a living document wired into your design reviews. When the architecture changes, the threats update. We leave your team able to run the next pass without us.
The UK SaaS scale-up, in real numbers. Twelve-week sprint, senior pairing, STRIDE and attack-tree analysis against the real dataflow, ADRs same day, evidence pipeline wired from week one. The acquirer signed retention before close.
Pain-first, soft-second. The questions every founder asks after their third bad security vendor.
The audit is fixed at £8K for five days: two senior engineers, dataflow diagrams, a STRIDE pass, a risk matrix, six ADRs, and a fixed-price quote for the work. After that, most threat modelling services sprints we sign land between £12K and £45K on an 8-to-14 week fixed-price basis, scoped at the audit. No day-rate, no scope creep. If we can’t fit your budget, we tell you in week one and you walk away with the audit brief, no commitment.
Most teams need STRIDE applied properly to every trust boundary, plus attack trees for the data that ends the company if it leaks. We lead with STRIDE as the default because it maps cleanly to engineering work. We bring PASTA in when the business context and attacker motivation matter for the risk ranking, and Trike where a requirements-driven model fits. We pick the method to fit your system, not the other way round.
You get an ADR pack, an audit log, an evidence pipeline, and a SOC 2 Type II stance. The acquirer’s CTO walks the surface and signs full-team retention, which has happened three times in 2024-25. The threat model itself, dataflow diagrams plus STRIDE pass plus attack trees, is the document a diligence team asks for. It reads cold without you in the room.
No. We work in place wherever possible. The threat model is drawn from your real system, not a greenfield rebuild. If a migration genuinely reduces risk, we scope it at the audit and you decide. Old and new run in parallel until you sign off. We’re AWS-default but have shipped on GCP, Azure, Cloudflare, DigitalOcean, Vercel, and Fly.io, so we model where your team already is.
This is the single biggest risk with a small studio, and the reason we pair. Every engagement runs two senior engineers, not one, and every decision goes into an ADR the same day. Mohit reviews every pull request. If one engineer leaves, the other has full context the next morning. In seven years, two engineers have left mid-project. Both handovers were inside 48 hours and neither client noticed in their sprint.
Fair question, we’ve all been burned. The engineers on your engagement are named, they run the audit week themselves, and every senior on the team has shipped at least 12 production projects across SaaS, fintech, healthcare, or AI. No bench, no bait-and-switch. Ask and we’ll send their recent commit history before you sign. Application threat modelling done by someone who has shipped the application, not a slide deck.
A Vanta or Drata evidence pipeline wired from day one. SOC 2 Type 1 is achievable in 8 to 12 weeks if you don’t already have it. A signed DPA plus SCCs for cross-border, a versioned sub-processor list, a DSAR runbook, and a right-to-erasure tool that honours deletion at the schema. Procurement clears in days instead of the quarter you don’t have.
You walk away clean. The handover pack includes the threat model, the ADRs, the runbook, the DPA, and a video tour of the model for your next engineer. There’s an optional quarterly retainer if you want a senior voice re-running the model as your architecture moves, cancellable with 30 days’ notice any month. Most clients run it three to six months while their in-house lead settles in, then end it without ceremony. No lock-in, no surprise renewals.
threat modelling services, in context — the dashboards, flows and components your team actually ships, reviews and maintains.
Tell us your current estate, your deadline, and the outcome you need. Mohit reads every first email and replies inside 24 hours: a clear yes, a clear no, or the one question that decides it, plus the next audit slot.
Yes, no, or the deciding question. Straight to your inbox, not a team thread.
We draw the dataflow, run the STRIDE pass, write the risk matrix, hand you a fixed quote.
Mitigations shipped, evidence pipeline live, the ADR pack your acquirer’s CTO reads cold.