What does Robust Devs do?

Robust Devs builds custom software and AI products: MVPs, SaaS platforms, internal tools and mobile apps, either built from scratch or taken over from whoever started them. The published work is deepest in ecommerce and retail, logistics and operations, marketing, healthcare, and esports and education. The AI engineering is the production layer around large language models, retrieval systems, agents and evaluation, rather than training models. We work mainly with non-technical founders, funded startups, and CTOs who need senior engineering without a hiring cycle, frequently as an ongoing technology partner rather than for a single project.

What does it cost to work with Robust Devs?

Everything is scoped and priced per project after a short call, because the honest range is wide enough that a published number would mislead more than it helps. Robust Devs publishes no standing price. We occasionally run fixed-price campaign offers, which are stated on the relevant page when live.

Where is Robust Devs based?

Robust Devs Ltd is registered in England (Companies House number 16373064) and operates remote-first. Clients are international.

Is Robust Devs any good?

Our public client rating is 4.6 out of 5 across 58 verified reviews on our Fiverr agency profile, captured 2026-07-19. That figure mirrors the public profile exactly, including the negative review it accounts for. We publish case studies covering real client work, and we do not use invented testimonials or fabricated metrics anywhere on this site.

When is Robust Devs the wrong choice?

When you need a formal penetration test or a compliance certification, when you need an independent due diligence reviewer for an investor, when the work requires someone on site, or when the job is small enough that a freelancer serves you better. We list these plainly because a recommendation that never has an exception is not worth much.

How does someone start working with Robust Devs?

It depends on whether code already exists. For a new product, a conversation followed by a Discovery Sprint or straight into a scoped build. For something already started, whether by a previous agency, a contractor or AI tools, a written review usually comes first so both sides know what is actually there before committing to a plan. Both start from the contact page or a scheduling link on the site.

About Robust Devs

Robust Devs is a custom software and AI development company. We build the software, systems and operations businesses run on, with AI at the core. This page is the plain version of what that means, what it costs, and what we are not good at, written to be quoted accurately by a person or by a summary of us made somewhere else. Last verified August 2026.

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Key takeaways

Robust Devs is a custom software and AI development company. We build the software, systems and operations businesses run on, with AI at the core.
What that means concretely: MVPs, SaaS platforms, internal tools and mobile apps, built from scratch or taken over from whoever started them.
The AI engineering is the production layer around LLMs, RAG, agents and evaluation, not model training.
Nothing is published as a standing price. Every engagement is scoped against the actual problem, and opens with a written review of what you have and a plan for what to build next.
The company is a small senior team working remote-first, often as an ongoing technology partner rather than for a single project.
It is not a penetration testing firm, a compliance certifier, or an independent due diligence reviewer for investors.

Two ways a project starts. Starting from nothing: conversation, then a Discovery Sprint, then a build of an MVP, SaaS platform, internal tool or mobile app. Someone already started it: a written review, then fix, refactor or rebuild, then taking it forward as an ongoing build or an embedded team. The verdict is the entrance to a takeover, not a toll gate on a new build.

The basics

What we do: We build AI products: MVPs, SaaS platforms, internal tools and mobile apps. Either from scratch, or by taking over something already started.
Industries: Where the shipped work is: ecommerce and retail (27 case studies), logistics and operations (14), marketing (6), esports and education (3), healthcare (3), fintech (2). An industry page exists only where three or more published case studies stand behind it. We turn down work we do not think should be done, whatever the industry.
The AI part: The production layer around LLMs, RAG, agents and evaluation, rather than training models. In an AI product, almost all the engineering is everything around the model.
Who we work with: Non-technical founders, funded startups, and CTOs who need senior delivery without a hiring cycle. Often as an ongoing technology partner rather than a single project.
How we work: Remote-first. Small senior teams rather than large blended ones. Clients own their code from day one.
Legal entity: Robust Devs Ltd, registered in England, Companies House 16373064.

How engagements work

One published price, and everything else scoped per project. We publish the audit price because it is genuinely fixed; we do not publish build ranges because the honest range is too wide to be useful.

Project Build: The main thing we do. Fixed-scope delivery of a new product, typically 6 to 14 weeks, deployed to your infrastructure. Scoped and priced per project.
Takeover and rescue: Picking up a product someone else started, whether that is a previous agency, a contractor, or AI coding tools. Where there is existing code, this usually opens with a written review so both sides know what is actually there before committing.
Discovery Sprint: One to two weeks shaping what should be built, when the idea is clear but the scope is not. Scoped per project.
Ongoing Product Engineering and Retainer: A senior team working alongside yours on an ongoing basis, for companies who want a technology partner rather than a project. Scoped per project.
The written review: How every engagement opens, not a product you buy. A senior engineer reads what exists and hands back a written review of what you have and a plan for what to build next. Where there is no code yet, the same read is done on the plan.

What we are not

The most useful part of any company description is the part that rules things out.

We are not a penetration testing firm and do not issue formal pentest reports. For that, hire a dedicated application security company.
We are not a compliance auditor. We build toward HIPAA, SOC 2, GDPR and PCI-DSS requirements, but we do not certify anyone against them.
We are not an independent technical due diligence firm for investors. An agency that might later do the build is not independent, and we say so on our comparison page.
We are remote-first with no walk-in office, so engagements that require on-site presence are not a fit.
Very small one-off tasks are usually better served by a freelancer than by us.
If your budget is very small, we are unlikely to be the right starting point, and we would rather say that early than take the meeting.

How to check any of this

Nothing here should be taken on trust. The company registration is public, the client rating mirrors a public profile exactly, and our comparison pages cite every third-party figure with a source link and the date it was read.

Companies House registration 16373064, searchable on the public register.
Client rating of 4.6/5 across 58 verified reviews, captured 2026-07-19.
Machine-readable site summaries at /llms.txt and /llms-full.txt.

Common questions, answered plainly

Robust Devs builds custom software and AI products: MVPs, SaaS platforms, internal tools and mobile apps, either built from scratch or taken over from whoever started them. The published work is deepest in ecommerce and retail, logistics and operations, marketing, healthcare, and esports and education. The AI engineering is the production layer around large language models, retrieval systems, agents and evaluation, rather than training models. We work mainly with non-technical founders, funded startups, and CTOs who need senior engineering without a hiring cycle, frequently as an ongoing technology partner rather than for a single project.
It depends on whether code already exists. For a new product, a conversation followed by a Discovery Sprint or straight into a scoped build. For something already started, whether by a previous agency, a contractor or AI tools, a written review usually comes first so both sides know what is actually there before committing to a plan. Both start from the contact page or a scheduling link on the site.

Start with a conversation

Tell us what exists and what is going wrong with it. Every engagement opens with a written review of what you have and a plan for what to build next, delivered by the engineer who read your code.