Expert Powered Consulting
Solve your problems with current experts from your field.
Numstack builds your team from senior specialists shipping in their field right now. You get current, hands-on judgement on your problem: defining the possible solutions, testing which ones work, and building the one that wins.
FellowShipping LLM systems
Free 45-minute discovery call. No pitch, no obligation.
How we build your team
A team assembled around your problems.
Numstack has no fixed bench. For each engagement we draw from the collective and appoint only the specialists your problem needs, senior people still doing the work in their field today.
It is matched to you, not made to fit. Appoint or pass a few specialists yourself to see how we shape teams.
Tap to appoint or pass. Illustrative of how we build your team.
Our practices
Six connected practices covering the work most businesses need
Each team draws on senior specialists still active in the field, so the thinking reflects how the work is done today, not a generic template.
Strategy & Transformation
Set direction and reshape the business for where it is going.
Operations & Performance
Run better, at lower cost and higher quality.
Commercial & Growth
Win more customers, revenue and markets.
Customer & Experience
Design experiences customers stay for.
Digital, Product & Technology
Build the products, platforms and technology that power it.
Brand, Marketing & Comms
Shape the story and take it to market.
Where we go deep
Deep experience in hard spaces, an open door to new ones
These are the spaces where we've built the most, where the details really matter. The fundamentals of good product travel, so whatever you're building, you get a team that has solved hard problems before.
- Built and scaled payment rails in production
- Built and ran fraud prevention and risk mitigation systems
- Built and managed credit-risk models
- Shipped LLM systems and recommendations at scale
- Set up model evaluation and data pipelines
- Built credit-risk models using reinforcement learning
- Rebuilt funnels that lifted conversion
- Built intelligent shopping and checkout flows
- Built rewards and loyalty flows that improved retention
- Improved reactivation and lifecycle revenue
- Built early churn detection for proactive engagement
- Advised on liquidity, matching, and trust & safety
- Grew supply and demand in balance
- Sourced and coordinated partnerships for a unique marketplace
- Built pipelines and warehouses teams rely on
- Made data trustworthy and fast to query
- Built MCPs so teams query data in natural language
- Ran penetration testing to harden a client's systems
- Tightened data handling and access controls to reduce exposure
- Closed security gaps before they could be exploited
- Built a litigation management system that cut undefended cases and default judgements
- Balanced panel allocation and centralised governance to reduce litigation costs
- Gave legal teams one place to track and act on every matter
- Delivered environmental compliance and permitting, including water-use and emissions licensing
- Ran impact assessments and groundwater and air-quality monitoring
- Planned mine closure and rehabilitation, including financial provision
- Built driver routing and planning with real-time route optimisation
- Optimised delivery and collection routes for efficiency
- Tracked inventory across the full courier lifecycle
This is where we've gone deepest so far, not the limit of where we work. Building in a different industry? That's often the most interesting conversation to have.
Have a problem worth solving?
Get senior, in-market judgement on it in a free 45-minute discovery call. No pitch, no obligation, and a straight answer either way.
Book a free consultWhy the collective
The difference is in how the work actually gets done
Not a promise, but tangible differences you feel across the engagement. A traditional consultancy sends advisers a step removed from the work; we build each team from specialists still doing it today.
Advising from playbooks that have aged out.
Still doing the work today, in your sector.
The senior names leave after the sale.
Who scopes it is who delivers it.
One lens on a cross-cutting problem.
Strategy, product, growth and brand, joined up.
Advice that looks good but stalls.
We help ship it, not just advise.
The team you get is the team they have.
The team is assembled to fit the work.
Designed for the next engagement.
Skills transferred, so the gains stay.
The Numstack Collective
Great at what you do?
Join the collective.
We build our teams from a collective of senior specialists. Become a Numstack Fellow, consult on projects that fit you, and earn a second income without leaving your job.
- Product
- Engineering
- Design
- Data & AI
- Strategy
- Marketing
- Go-to-market
- Business development
Access without the overhead
The best input, at a fraction of the cost
The best people in product, engineering, and AI already have jobs, and hiring them full-time is slow and expensive, if you can get them at all. The Numstack Collective gives you their current, in-market expertise exactly when your problem needs it, and only for as long as it does. You get senior judgement on tap, without a senior salary on the books.
Senior, not full-time
Only what you need
Current, not cached
How we think
Practical techniques, quality product, world-class engineering
Problems first, features second
We start from the real-world problem and the customer feeling it. Everything we build has to earn its place against that.
A senior collective, not a factory
You work with experienced professionals who currently ship and scale real products in your field, not a rotating bench, with theoretical knowledge.
Practical over theoretical
We use lean, proven techniques to move fast and reduce risk, favouring evidence and shipped software over slideware.
Let's find out if we can help.
Book a free 45-minute discovery call. We'll dig into the problem you're solving, tell you honestly whether we're a fit, and outline what we could deliver together.