Expert capacity, exactly when you need it
Some services do not need a full time employee. They need the best person you can find, a few days a month, exactly when it matters. That is what task outsourcing means here: an expert who is invested, available and reliable, without paying for capacity you will never use.
Development, ecommerce, data science, performance marketing: every service on this site can be engaged this way.
The capacity maths
A full time expert costs €80k+ a year.
Why Outsource
A full time hire is the wrong tool for an occasional job
The need is real, but it does not fill a working week. Hiring means salary, recruiting, management and idle time. Doing nothing means falling behind. There is a third option.
You cannot justify the expense
The work arrives in bursts: an upgrade here, a campaign there, a forecast before budget season. A full time salary for that is money burned on idle time.
You cannot find or afford the expert
Seniors who build shops, model data and run profitable campaigns are rare and expensive. On a fractional basis, that level suddenly fits your budget.
You still need it done properly
Ad hoc must not mean amateur. The stakes are the same as for a big company: it has to work, it has to last, and someone has to answer when it breaks.
How It Works in Practice
Stint outsourced their website to me. It just works.
Stint, a London based hospitality staffing platform, needs their marketing site to be excellent, but it only needs attention occasionally: changes, upgrades, new landing pages, tracking. Instead of hiring, they outsourced it to me. They get senior development and growth expertise the moment something is needed, and pay nothing while nothing is.
And the website is only where it started. As trust grew, so did the scope: today I also support Stint with performance marketing and data science. Maybe your task stays a task, maybe it develops the same way. Both are fine, that is the whole point of the model.
What You Can Outsource
Every service on this site, on a fractional basis
These are the same services from the pages you may have already read, engaged for exactly the hours they need. Each card tells you what the occasional version looks like, and each link shows the full service behind it.
Ecommerce Development
Your shop runs, but the work comes in waves: a new integration, a feature, an upgrade, a performance fix. You need a Solidus expert on call, not on payroll.
Ecommerce developmentSaaS & Web Development
A feature each quarter, an upgrade each year, the odd emergency. Exactly how Stint runs their website with me.
SaaS developmentData Science
A forecast before budget season, dashboards that maintain themselves, one deep analysis when a decision matters. No data team required.
Data sciencePerformance Marketing
Campaigns run in seasons. Get the strategist while spend is live and stop paying when it is not.
Performance marketingThe Promise
Invested, available, reliable
Outsourcing only works if the person on the other end treats your product like their own. That is the standard here, and it is the whole reason people get in touch.
Invested
I build and run my own products, so I treat yours the same way: clean code, documented decisions, no shortcuts that bite later.
Available
Direct line, quick answers, no ticket queue and no account manager in between. When something breaks, you reach the person who can fix it.
Reliable
Monthly terms, honest estimates and everything documented so you are never locked in. The work keeps you, not a contract.
Test the model with zero risk: workshop first, then two weeks on me.
A free workshop with plans, forecasts and honest numbers, then two weeks of expert work on me, no strings attached. And if a full time hire genuinely makes more sense for your case, I will tell you that too.
Partner With Me
Agency Partner Programme
Expand your service offering without the overhead
Join forces with a growth specialist to offer your clients advanced capabilities in growth hacking, data science, and custom development. Whether you refer clients or white label my services, you benefit from a proven track record and competitive commission structure.
Your Benefits
- 20% commission on referred client fees, then 10% (up to 24 months)
- White label services under your brand with full transparency
- Access to premium tools and platforms at no extra cost
- Expand into growth hacking, data science, and dev without hiring
- A responsive single point of contact who does the work
- Stepped commission for up to 24 months per referred client
Introducer Partner Programme
Turn the introductions you already make into recurring income
Businesses, individuals and recruiters all sit in conversations where a company admits it needs marketing help, development resources or data capability it cannot hire for. Introduce them to me, directly and in writing, and earn commission on their fees for up to 24 months.
Your Benefits
- 15% commission on referred client fees, then 10% (up to 24 months)
- Open to businesses, individuals and recruiters, one registration
- Professional handover and client management
- Monthly reporting on referred client activity
- Passive income stream that compounds over time
- 12 month referral protection after partnership ends
AI writes the code. Who is responsible for it?
Capacity you can hand work to, with a name on it
Outsourced tasks are where AI generated code slips into a codebase unnoticed. What you get from me is the opposite: a person who reads what ships.
Code nobody reviewed entering your product
Every change goes through tests and a human review, with AI as the second reader, never the only one. Your critical paths stay verified.
Nobody accountable when it breaks
One named engineer, a documented process and an audit trail, which is also what keeps the work insurable.
Paying team prices for one person's work
AI makes the low risk work fast, the saving is in the price, and you pay for judgment rather than for typing.
Where AI builds, where I decide
Low risk: AI builds, I glance
- Layouts and styling
- Forms and validation
- Boilerplate off the critical path
- Seed data, scripts, docs
Medium risk: AI drafts, I edit
- Edge cases for the tests
- Review as a second reader
- Refactoring under green tests
- Release notes from the tests
Critical path: I decide, AI advises
- Architecture and data model
- Money, tax, payments
- Authentication and permissions
- Every verified critical path
The lower the blast radius of a mistake, the more AI builds alone. The higher it is, the more it advises while a person with a name on the contract decides, reads and tests.
Why that costs you less, not more
- Account manager
- Project manager
- Designer
- Developer
- QA
- One accountable engineer
- AI on the low risk work
Agency team
Me, with AI
The hours for layouts, forms, scaffolding and documentation have collapsed, and that saving is in my package prices. The hours for judgment, architecture and proof have not, and that is what you pay for. One person, no hand-offs, no coordination overhead, and more tests than before because writing them is no longer the expensive part.
What you can check, not just read
- Tests you can read in plain language in your client hub
- Critical paths verified and frozen behind approval
- A release register and an audit log
- Code, data and infrastructure in your name
AI changed who writes the code. It did not change who answers for it.
How every engagement runs
Enterprise discipline, one person
Anyone can promise quality. I run every engagement through systems that prove it: a real client portal, legal clarity before work begins, and evidence for every release. This is what working with me actually looks like.
Your own client portal
Every client gets a seat in the Keferboeck Hub: onboarding, documents, dashboards and live project links in one place. Structured from day one, so nothing important ever lives in a lost email thread.
Legal clarity before work begins
Contracts, terms and insurance documents live in a portal vault. Signed versions are locked forever, every view and download is logged, and onboarding includes a formal review and acceptance step, with the option to hand it straight to your legal team.
Every release documented
Production releases are versioned, timestamped and written up: what was added, what changed, what was removed. You can always answer the question "what exactly went live, and when", because the record exists.
Tests gate every release
The full TDD and BDD suites must pass before anything reaches production, and the runs are recorded as evidence, with coverage tracked. A release that has not proven itself does not ship.
Verifiable by third parties
Critical business logic, how a calculation works, which legal documents a signup binds, is written up in plain language, approved by you, frozen at that state, and exportable as a PDF in English and German for your auditor. Changes reopen the approval, so the record never drifts from reality.
Security tested
Major production releases get web application security testing on top of the automated suites, grounded in formal offensive security training. Systems that hold customer and payment data deserve nothing less.
Insured, properly
A comprehensive insurance package is in place through the broker JMG: professional indemnity, public liability, employers liability and cyber cover. The insurer knows explicitly that my systems handle accounting grade workloads for SaaS products, loan interest and repayment calculations included, so exactly that work is covered.
And if I fall under a bus?
Everything is documented: architecture, decisions, processes, tests and the code itself, all written for the next person to pick up cold. If anyone else ever needs to take over, for any reason, the handover is instant and smooth. No key person risk, no vendor lock in, no hostage code. Very few agencies can honestly offer that; almost no freelancer can.
The other side of that coin: I play a central role in every project and I take responsibility for it. I do not vanish the moment a better offer turns up. The setup is simply built to change as you grow. When the workload gets massive, parts of what I do can move in house, your team owns the day to day, and I focus on whatever challenge matters at that stage of the growth cycle. That is the plan working, not a breakup.
How working with me runs, in full