AI Application Development
AI applications built for accuracy and scale
We design and build complete AI applications: intelligent products, internal copilots and AI features woven into real workflows. Built on OpenAI and Claude, shipped fast with modern tooling like Cursor, and engineered so answers stay accurate and costs stay predictable.
- 513+ projects delivered
- ★ 4.9 from 678 verified reviews
- Clients in 20+ countries
Trusted by brands worldwide
Projects launched
Fiverr rating
Years experience
Countries served
The distance between an AI demo and an AI product is engineering
Anyone can wire a prompt to a model and get an impressive demo. Products are harder: they need your data connected safely, guardrails that stop confident nonsense, evaluation that proves quality, and an interface people trust enough to use daily.
That is the work we do. We have shipped AI features into production stores and business tools, and we build with the same platforms powering today's best AI products: OpenAI, Claude, n8n for orchestration and rapid stacks like Base44, Lovable and Bolt.new when speed matters most.
Why brands choose Devjour
Not just another development agency: a growth partner focused on what your website earns, not just how it looks.
678 verified 5-star reviews
A 4.9 rating across 678 Fiverr reviews and 500+ delivered projects. Our track record is public and verifiable.
Conversion first, always
We measure success in revenue, not deliverables. Every layout, feature and line of copy exists to move buyers to checkout.
Fixed quotes, zero surprises
You get a fixed price and timeline before we start. No hourly meters, no scope-creep invoices.
Senior team, direct access
You talk to the people doing the work, including experience building for top US brands at Sharma Brands.
What you get
AI product development
Complete applications where AI is the core: from concept and UX through models, data and deployment.
Copilots & assistants
In-app assistants that draft, summarize, answer and act, grounded in your product's data.
Retrieval over your data
Accurate answers across documents, tickets and databases with citations users can check.
Model orchestration
The right model per task: GPT, Claude or open source, routed by cost, speed and quality.
Evaluation & guardrails
Test sets, output validation and human review paths so quality is measured, not assumed.
Cost & performance control
Caching, token budgets and monitoring that keep AI spend flat as usage grows.
AI tools & platforms we work with
OpenAI
Claude
n8n
Cursor
Base44
Lovable
Bolt.new
Our process
You always know what happens next. From the first call to 30 days of free post-launch support.
Case studies
All case studiesCustom & Gifts
Jetpack Stickers
Full website build for a custom sticker company, including a live sticker configurator where customers design, price and order in one flow.
Challenge, solution and results →Home & Lifestyle
Drool Art
Full website build for an art-print brand, with dynamic product framing so shoppers preview any artwork in any frame and size, live.
Challenge, solution and results →Sports & Fitness
Timeless Jump
Full website build for a jump-rope brand, with individually designed product pages for every rope, mat and accessory in the range.
Challenge, solution and results →What clients say
Real reviews from verified Fiverr clients
“Had a great experience with Devjour Tech. He built me a full website with lots of customized sections that required a professional web designer. It's tough these days to find people who can actually do what they say they can do. I am so happy I have found a developer that I know can confidently do the work that is needed. 5 stars!!”
“Great service and went above the required job! I wanted help with some specific coding and font adjustments, the coding has now allowed me to fully control the font sizing with an adjustment tool which is super helpful! Small issues with the website were also fixed. Would highly recommend if you are looking for a coding expert for your Shopify store!”
“We are very happy with the work delivered. He helped us solve several bugs and issues we had on our website and was extremely helpful throughout the entire process. Communication was always professional and efficient, and he paid great attention to detail while following all the guidelines we provided.”
“This is the second project we have worked on and I have been completely satisfied each time, the work was executed professionally and he did what he said he would do. Highly recommend.”
The Devjour difference
An investment that pays for itself
A faster, conversion-focused website is not a cost, it is infrastructure for growth. The work we do is aimed squarely at the numbers that move your business:
- More completed checkouts
- Higher average order values
- A better mobile experience
- Lower bounce rates
- Increased repeat purchases
Technologies we use
- OpenAI GPT
Anthropic Claude
Next.js
Node.js
Python
PostgreSQL- Vector DBs
AWS
The team behind your project
Meet the companyMore AI services
AI Application Development questions
Which models and platforms do you work with?
OpenAI and Claude for the intelligence, n8n for workflow orchestration, and rapid build platforms like Base44, Lovable and Bolt.new where they fit. Builds stay model-agnostic so you can switch providers later.
How do you keep AI answers accurate?
Grounding in your real data, strict output validation, evaluation sets run on every change, and human review paths for high-stakes actions.
What does an AI application cost?
We usually start with a scoped pilot that proves value on one workflow, then expand. You get a fixed quote after the free consultation.
Is our data used to train models?
No. We use API access with training disabled by default, scope data tightly and sign NDAs before discovery.
Not ready to start yet?
Free AI Consultation, on us
Tell us about your website and we will send back honest, specific recommendations. No strings attached.
Ready to grow with ai application development?
Free 1-hour strategy call. Clear plan, fixed quote, zero obligation.