AI development partner for a startup

This page is for a startup building its first AI product. An AI product here means software in which an AI model does part of the work, such as reading documents, answering customers or making suggestions. Most firms on this page sell what they call an MVP, a minimum viable product: the smallest first version that real users can try, so the founders can learn whether people want it before they spend more.

The firms below were matched to this situation by a sentence on their own websites, most often on a startup or MVP page. Reveneau is first and Fluxon second. The other seven follow in the order of the research notes, and that order gives no ranking. Each page was opened on 21 October 2026. For a longer list of firms in one region, read AI development companies for startups in Silicon Valley.

What a startup needs from a partner

A startup has less money and less time than a large company, and it may have no engineers of its own yet. So four things matter more here than in the other situations in this guide.

1. A small first scope. The firm should help you decide what to leave out of the first version, and write that down.
2. A test with real users. The first version exists to show whether people want the product.
3. A way to hand over. At some point you will hire your own engineers. They need to be able to read, change and test the code the firm wrote.
4. Clear ownership. The contract should say that the startup owns the code, the tests and the data.

No survey of how startups use outside developers could be opened for this guide, so this page gives no figure for that.

The firms at a glance

Firm	What its startup page offers, in its own words	Main office, and who says so	Size, and who says so	Anthropic tier
Reveneau	A startup service	San Francisco and Vancouver (own site)	Not stated	Not listed (searched 20 October 2026)
Fluxon	"Go from idea to something customers can use"	San Francisco (Stripe listing, address from Fluxon)	200 employees (Forbes, as of March 2026); "300+ builders" (own careers page)	Not listed
Altar.io	A "structured process to build your MVP"	Lisbon (own footer)	Not stated on the pages read	Not listed
thoughtbot	Assess an AI-made prototype and "keep what works"	No address published (own pages)	Not stated on the pages read	Not listed
Netguru	An MVP "in a couple of weeks"	Poznań (Polish KRS register)	"400+ people" (own about page)	Not listed
STRV	Help taking "a product idea" to market	Prague (Czech ARES register)	"200 + People" (own about page)	Not listed
Monterail	"Build your MVP with a team that understands your business goals"	Wrocław (Polish KRS register)	"130 + Team members" (own homepage)	Not listed
Lazer Technologies	Engineers who work inside "high-growth startups"	Toronto (own privacy policy)	"200+" engineers, designers and product managers (own about page)	Select
Pragmatic Coders	Experience "from more than 60 startups", its own count	Kraków (Polish VAT register)	Not stated on the pages read	Not listed

Anthropic's directory lists the service firms in Anthropic's partner program, and Anthropic sets each firm's tier. It held 321 entries when it was read on 21 October 2026 [1].

The firms

1. Reveneau

Reveneau works from two offices: 435 Utah Street in San Francisco, and Floor 33, 909 Mainland Street, in Vancouver. It has a service page for startups and one for a full product build. Reveneau says it writes 100 percent of its code with AI, and that every change has to pass a large eval suite before it is released. An eval suite is a set of automated tests, and Reveneau says it writes the suite from the specification, the written description of what the software must do. It says the suite is graded by Jev, and that Jev makes the suite run ten times faster than its previous grader. Reveneau says it uses AI instead of hiring more engineers, puts that saving into its clients' prices, and takes responsibility for the whole project through production, the live system people use, and after release. Reveneau has no entry in Anthropic's directory: all 321 entries were searched on 20 October 2026 [1].

For a startup, the specification is the part to prepare. Because Reveneau says the tests are written from it, the founders need to agree in writing what the first version must do. Ask Reveneau to show you the specification and a sample of the tests before the build starts, and ask the same of every other firm on this page.

Fits: a startup that wants its first AI product written by AI and checked against a written specification before each release. You can contact Reveneau to describe the product.

Pick someone else if: your investors require a partner listed in Anthropic's directory, or you want a team with an office outside San Francisco and Vancouver.

2. Fluxon

Fluxon's startup page says, "Go from idea to something customers can use, without waiting months to build the team." It also says, "Start with a senior team now, then keep building as you hire your own." [2] The same page says, "1 in 4 of the companies we’ve worked with has gone on to be acquired", and lists six companies that bought them, by year. That figure is Fluxon's own, and no outside source checked it. Fluxon's listing in Stripe's partner directory gives an address at 236 West Portal Ave in San Francisco, which Fluxon supplied [5]. Forbes's company page for Fluxon counts 200 employees as of March 2026 [3], while Fluxon's own careers page counts "300+ builders" [4]. The two counts come from different sources. Fluxon has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a startup that wants a senior team to build the first product now and then work alongside the engineers the startup hires later.

Pick someone else if: you need a firm listed in Anthropic's directory.

3. Altar.io

Altar.io gives its head office in its homepage footer as R. Adriano C. de Oliveira 4A, 1600-312, in Lisbon, Portugal [8]. Its MVP page says, "We use a structured process to build your MVP quickly and on budget." [6] It calls the first step the Product Scope. The same page describes that step once as "an intensive, 7-day, structured process" and once as "an intensive, 15-day, structured process", and the pricing page calls it "A structured 15 day process" [7]. So Altar.io's pages give two lengths for the same step, and you should ask Altar.io which one applies to you.

The pricing page shows example projects "we worked on over the last few months", with prices from €18k for 2 months to €350k for 5 months. One example, labelled Legaltech, is listed at "2 months" and "€100k" for "An MVP for a complex AI tool that analyses public rules on securities and advises front-office bankers on their sales choices". These are recent projects the firm chose to show, so ask for a written quote for your own project. The Portuguese company register was not checked. Altar.io has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a founder who wants a fixed first step to agree the scope, and wants to see a range of past prices before the first call.

Pick someone else if: you need a team with an office in North America. The only office on the pages read is in Lisbon.

4. thoughtbot

thoughtbot prints no office address on the pages read. Its company page gives phone numbers for the US and the UK [10], and its homepage says, "We now have teammates located throughout the Americas, Europe, West Asia, and Africa". Its site footer names the company as thoughtbot, inc. Its MVP development page speaks to founders who arrive with an AI-generated prototype or a rough version they built themselves. It says, "We assess what you have, keep what works, and build production-ready software" [9]. A prototype is an early version made to test an idea, and production-ready software is software fit for real customers to use. The page also offers a first planning sprint, a short fixed period of work, to research with target users and plan what to build and in what order, "in as little as 2 weeks" by its own account. The same page says thoughtbot builds products for regulated industries, so it also appears on the regulated industry page. thoughtbot has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a founder who built a first version with AI tools and wants it checked and rebuilt into software customers can use.

Pick someone else if: you want to meet the team at an office. No office address appeared on the pages read.

5. Netguru

Netguru is registered in Poland's National Court Register, the KRS, as Netguru S.A., a joint-stock company, with its seat at ul. Małe Garbary 9 in Poznań [12]. Its about page says "400+ people on board" [13]. Its MVP page says, "Move from an idea to a tangible product in a couple of weeks." It also says, "We'll develop and launch your MVP while you focus on other areas of the business." [11] "A couple of weeks" is the firm's own wording and gives no number. Netguru also offers to place an AI engineer inside a client's team, which is covered on the page for engineers in your team. Netguru has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a founder who wants the firm to build and launch the first version while the founders work on other parts of the business.

Pick someone else if: you need a fixed number of weeks in writing before you start. Ask Netguru to turn "a couple of weeks" into dates.

6. STRV

STRV is listed in the Czech ARES register, the country's public register of businesses, as STRV s.r.o., at Rohanské nábřeží 678/23 in Prague 8 [15]. It also names an office in Brno. Its about page counts "200 + People" [16]. Its homepage describes STRV as a digital product company that designs, builds and scales mobile and web products for well-known brands and for startups [14]. Its services page opens with, "You have a product idea. So now what?" The AI work on the pages read is a list of services, and no AI case study was opened for this guide. STRV has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a startup whose first AI product is a mobile or web app for consumers.

Pick someone else if: you want to read an AI case study before you call. Ask STRV for one, because none was opened for this guide.

7. Monterail

Monterail is registered in the KRS with its head office at ul. Oławska 27 in Wrocław, Poland, and the register lists two family foundations as its shareholders [18]. It also names an office at Friedrichstr. 155 in Berlin, and its homepage counts "130 + Team members". Its MVP page says, "Build your MVP with a team that understands your business goals." [17] The same page says, "Multiple profitable companies today started with MVPs crafted by Monterail." That sentence names no company, and the claim is Monterail's own. Monterail has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a European startup that wants a first version to test with users before it pays for the full product.

Pick someone else if: you want named startup cases before you call. Ask Monterail which companies that sentence refers to.

8. Lazer Technologies

Lazer Technologies says in its privacy policy that it is the business name of 2621956 Ontario Inc., an Ontario company with its registered office in Toronto, Canada [20]. Its about page speaks of "a team of 200+ senior engineers, designers, and product managers" [21]. Its homepage says Lazer "forward-deploys into ambitious enterprises, high-growth startups, and AI labs" [19]. To forward-deploy means to send engineers to work inside the client's company, with its people and systems. The homepage also shows a testimonial from a client that describes itself as a startup backed by venture capital funds. A testimonial is the firm's choice of what to show, and the person quoted was not contacted for this guide. Outside Anthropic's tier, each fact here is Lazer's own statement. Anthropic's directory places Lazer Technologies at the Select tier [1].

Fits: a funded startup that wants senior engineers to work inside its own team on the first AI product.

Pick someone else if: you want a separate team to build the first version outside your company. Lazer's homepage describes engineers who work inside client companies.

9. Pragmatic Coders

Pragmatic Coders gives its office on its contact page as ul. Opolska 100, 31-323 Kraków. Poland's Ministry of Finance VAT register, the public list of companies registered for VAT, a tax on sales, returns the same Kraków address for Pragmatic Coders, a Polish limited company, with KRS number 0000601571 and a VAT registration date of 29 February 2016 [23]. A menu on its pages says, "Here we share our knowledge and experience from more than 60 startups we helped build in the last years." [22] The 60 is its own count, and no outside source checked it. Pragmatic Coders also offers to take over software projects that have stopped delivering, so it appears on the failed build page too. Pragmatic Coders has no entry in Anthropic's directory as read on 21 October 2026 [1].

Fits: a startup that may need to take over and fix work that another team began.

Pick someone else if: you need a team with an office in North America. The office on its contact page is in Kraków.

Questions to ask a firm before the first version

Send every firm the same questions, in writing, with one date for answers:

• What will the first version do, and what will it leave out? Ask for both lists.
• How long is each step, in dates? Altar.io's two lengths for one step show why this needs asking.
• How will each change be tested, and will you give us the tests with the code?
• Who owns the code, the tests, the designs and the data on the day the contract ends?
• When we hire our own engineers, how will they take over the work?
• Which company signs the contract, and where is it registered? Four firms on this page were found in a public register for this guide.
• What does the AI model cost each month to run, and who pays that bill?

For a printable form with these questions and the questions for the other situations, use the AI partner situation checklist. For the method behind this page, read how firms were matched to situations. To compare startup firms in the San Francisco Bay Area, read the Silicon Valley guide.