Questions we get on the first call. All of them.

Grouped by topic. Each question also lives on the page it belongs to; the link next to it takes you there.

General

What do you build?: Custom software with an AI part that does real work. Document processing, email triage, data extraction, matching, generation, internal tools, and full products built around one of those. We do not build marketing automation, outbound systems or chatbots with no data behind them.
Where are you, and how do time zones work?: Infinity Systems LLC is a US company registered in Wyoming. Engineering is in Serbia, on Central European Time. For US clients that means a shared window of 9:00 to 13:00 Eastern, and work delivered while you sleep. EU, UK and Swiss clients share our full working day.

Pricing

How does pricing work?: Every build is a fixed-price sprint. You get a written quote with a price and an end date after a 30-minute call and a one-page brief. The quote covers the written scope. If we underestimated, we absorb it. Scope changes get a new written quote before we start on them.
Who is this not for?: Builds under $10,000, hourly staff augmentation, enterprise procurement with RFPs and security questionnaires before a scoping call, regulatory certification as a deliverable, payment in equity or on success, and lead generation or outbound systems.
What is the payment schedule?: Feature and Product Sprints are paid in three parts, 30% at signing, 40% at the mid-sprint demo, 30% at production deploy. Platform Sprints are paid in four parts, 30%, 30%, 20%, 20%. We invoice in US dollars; euros on request.
What does the Continuous Build retainer cover?: A fixed number of build days each month, weekly releases, a roadmap call, hosting and monitoring operations, dependency updates and model cost reporting. The Full plan adds on-call for production incidents. First term is three months, then month to month with 30 days' notice.
What happens if the scope grows during a sprint?: We log every new idea in a visible "next" list. Anything that must ship inside the sprint gets a written change quote before we start on it. Everything else becomes the first roadmap of the retainer.
What moves a quote toward the top of a range?: More integrations, more user roles, migration from an existing system, a security review, and AI workflows that need their own evaluation data set. Fewer of these move it toward the bottom.
Why do you show price ranges and not one price?: Because scope differs. The range tells you where a build of that kind lands. Your quote is one number, in writing, before work starts.

Process

What happens after the fix window ends?: Most clients continue on a Continuous Build retainer, which starts while the fix window is still open, so there is no gap. If you stop, you keep everything and can hire anyone else to continue. There is no lock-in to break.
How long does a build take?: A Feature Sprint takes 2 to 4 weeks, a Product Sprint 4 to 8 weeks, a Platform Sprint 8 to 12 weeks. The end date is on the quote. We show you working software every week.
What does the week-one exit mean in practice?: After the first weekly demo you can stop. You pay only the signing deposit, which covers that week, and you keep everything built so far, including the repository and the accounts in your name.
What does "in production" mean to you?: Deployed on your cloud account, monitored, documented, with a runbook, and used by real people with real data. A demo is a milestone. Production is the finish line.
What do you need from us each week?: One person who can make decisions, about two hours a week for the demo and questions, access to the systems we integrate with, and sample data early. The faster the answers, the faster the build.

AI and stack

Which AI models do you use, and are we locked in?: We choose the model per task, by quality and cost, and keep the model layer behind one interface so it can be swapped. Model accounts are yours from day one. Nothing in the build ties you to one vendor.
Can you use our stack instead?: Often, yes. If your system is TypeScript, Python or a mainstream cloud, we work inside it. If it is something else, we say so on the first call and quote accordingly or recommend someone else.
Who writes the code, people or AI?: Both. AI coding agents write most of the code. The founder designs the architecture, writes the hard parts, reviews every change, and is on every call. Every change ships with tests and goes through a review gate before it reaches your repository.
Why this stack?: Because we have shipped with it and can support it. TypeScript end to end keeps one language across the product. Postgres is boring in the right way. The AI layer is isolated so a model can be swapped without touching the product.

Guarantees and legal

What does "in your name" mean for accounts?: The repository, the cloud account, the model API accounts and the domain are created under your organisation at kickoff. We work inside them with the access you grant. When we leave, you revoke our access. Nothing moves.
How is the fixed price protected?: The statement of work lists the scope. The price covers that scope. Our estimation errors are ours. Only a written change order you approve can change the price.
Do you sign NDAs?: Yes, within 24 hours of a request. You do not need one for the first call. We talk about the problem, not your secrets.
What is not covered by the guarantees?: Changes you make to the system after handover, third-party outages, and costs of your own accounts such as cloud or model usage. The fix window covers defects in what we built, as described in the statement of work.

Contact

Should I book a call or send a brief?: Send a brief if you already know what you want built. Book a call if you want to talk it through first. Both lead to the same written quote.
How fast do you reply?: First reply within one business day. A written estimate within three business days of receiving your brief.

Services

Is 4 to 8 weeks enough for a real MVP?: For a focused product, yes. The sprint has one AI core, up to four roles, payments and admin. What it does not have is a second product idea. We cut scope on the first call, in writing, and the quote reflects it. On this page
Do I need a designer?: A designer joins the sprint for one to two weeks for the product's key screens and a small design system. It is in the price. On this page
What if my idea needs a model that does not exist yet?: Then we say so. Before quoting, we run a short feasibility test on your data. If the result is not good enough, you get the finding, not a sprint. On this page
Can you take over after launch?: Yes. Most clients continue on a Continuous Build retainer with the same people, a weekly release and a roadmap call. It starts while the fix window is still open. On this page
How much manual work has to exist for this to pay off?: As a rule of thumb, from about 20 hours a week of repetitive reading, typing or routing. Below that, the fixed price takes longer to earn back and we say so on the call. On this page
What data do you need from us?: A sample of real cases, 100 or more, with the correct outcome where you have it. Access to the systems the workflow reads from and writes to. We sign an NDA first if you want one. On this page
What happens when the model is wrong?: Low-confidence cases go to a review queue, a person decides, and the decision becomes training data for the evaluation set. The system gets more precise with use, and nobody loses a case to a silent error. On this page
Can it run inside our existing tools?: Usually. We integrate with the inbox, ERP, CRM or storage you already use. If a tool has no API, we tell you on the first call and quote the workaround. On this page
Why does a Platform Sprint need a paid Scoping Review first?: Because migration and integrations hide surprises. The Scoping Review is five days, $1,500, and ends with a written scope, an architecture sketch, a risk list and a fixed quote. It is credited against the sprint if you sign within 30 days. On this page
Can we keep using the old system during the build?: Yes. The new system is built alongside, migration is rehearsed on a copy, and the cutover is one planned step with a rollback. On this page
Who is on the team?: The founder leads and reviews everything. A part-time second engineer, a designer for the key screens, and an external security reviewer join for the parts that need them. Agents do the volume. On this page
What about our data and compliance?: The system runs on your cloud account in the region you choose. We build GDPR-aware and HIPAA-aware systems; the certification itself stays with you, and we say that plainly. On this page

Industries

Have you shipped this for a law or accounting firm?: Not yet, and we say so on this page. The document workflows are the same ones we build elsewhere. The first firm gets an honest quote and a case study it can approve. On this page
Is our data used to train anything?: No. Model accounts are in your name with training opt-out, and the evaluation sets we build stay in your repository. On this page
Can the system make decisions on its own?: Not the ones that matter. Anything with legal, financial or client-facing effect goes through a review step. The model drafts and sorts; a person decides. On this page
Have you built real estate software before?: Not for a client yet, and we say so on this page. The first agency gets an honest quote and a case study it can approve. On this page
Can you integrate with our listing portal or CRM?: If it has an API or an export, yes. We check that on the first call and name it in the quote. On this page
What about photos and floor plans?: Models can now read floor plans and tag photos reliably. Both are typical Feature Sprint scope. On this page

Answers and comparisons

Is a fixed price always more expensive?: It carries a margin for the builder's risk, so a perfectly estimated hourly project would cost a little less. Perfectly estimated hourly projects are rare. Most fixed-price buyers pay less in total because scope and date are decided before work starts. On this page
What should a fixed-price quote contain?: The scope in plain language, what is explicitly out, the end date, what "done" means, the payment schedule, the fix window, who owns the code and accounts, and how a change is priced. If any of these is missing, it is not a fixed price. On this page
How do you handle changes?: New ideas go on a visible list. Anything that must ship inside the sprint gets a written change quote before we start on it. Everything else becomes the first retainer roadmap. On this page
What makes an MVP take longer than 8 weeks?: Three things. A second product idea added mid-sprint. Integrations with systems that have no API. Decisions that wait more than a day. The first two are cut or quoted in writing before the sprint; the third is on both of us. On this page
Can it be faster than 6 weeks?: One AI feature on an existing product, yes, 2 to 4 weeks. A full MVP with accounts, payments and admin cannot be done well faster than six, and we do not quote it that way. On this page
When do I see something working?: At the end of week one. You see the AI core on your data with a first accuracy number, and you can stop there and keep the work. On this page
Why is one AI feature $10,000 and not $5,000?: Because the feature is in production, not in a demo. The price covers integration with your systems, a review queue, an evaluation set on your real data, deployment on your cloud, monitoring and 30 days of fixes. The model call itself is the cheap part. On this page
Do agencies charge more or less?: Agencies typically bill $50 to $150 an hour with teams of 2 to 10 people and no fixed date. A 12-week project with three people at $75 an hour is about $108,000, open-ended. Freelancers charge less but cannot take a platform-sized build alone. On this page
What about the cost of the AI itself?: Model usage is billed by the provider on your own account. A document workflow processing a few thousand items a month costs tens of dollars. A product with heavy generation can reach a few hundred. We measure it in the first week and show you the number. On this page
Do I contract with a Serbian company?: No. You contract with Infinity Systems LLC, a US company registered in Wyoming, and pay in US dollars. The engineering is done in Serbia. For EU clients we invoice in euros on request. On this page
Where does our data live?: On your own cloud account, in the region you choose. US clients usually pick a US region, EU clients an EU one. Model accounts are yours too, with training opt-out. On this page
How does the time difference affect the work?: For the US it helps. Work done during the European day is ready when you wake up, and the afternoon overlap covers calls and decisions. For the EU, UK and Switzerland there is no difference at all. On this page
Is a small team with AI agents really as fast as an agency?: For builds of this size, faster, because there is no hand-off chain. Agents write the volume, the founder reviews every change, and decisions take hours, not meetings. For a programme needing twenty people, no, and we say so. On this page
What is the risk of a small team?: Capacity. We publish a capacity rule, at most three engagements at once, and the week-one exit means you can leave early with everything if the fit is wrong. On this page
Why not just hire?: A hire takes three to six months to find and costs salary before anything ships. A sprint ships in that time. Many clients do both. The sprint builds the first version, and the hire takes it over with our handover. On this page

Book a call, or send the brief. A written price in three working days.

No NDA needed for the call. We sign one within 24 hours if you want it.

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