Overview

About Diffco

Diffco is a San Francisco-based AI-first software engineering partner for growth-oriented teams. We embed senior engineers and product strategists who turn AI vision into shipped, revenue-driving products. Our team has spent the last 18 years building: SaaS platforms, web&mobile apps, and now AI-native systems for best startups to top U.S. enterprises in healthcare, finance, and other regulated industries. Products we developed are used by renowned companies such as American Express, Starbucks, Whole Foods, Mars, and many successful startups like Maze, Happier, and Legion Farm, among many others.

We pair that engineering depth with sharp product thinking and a proprietary delivery model Production-Ready AI Engineering designed for the AI era.

Why Diffco?

  • AI Engineering as a core
  • Client-driven approach and clear communication
  • Transparent processes and billing
  • Detailed reporting and deliverables
  • Dedicated project team with no cross-project sharing

What clients say

Review Analytics of Diffco

Every review is verified through Goodfirms before it's published.

4.938 Verified Reviews
Quality5.0
Schedule & Timing4.9
Communication4.9
Overall5.0
Review Summary
Summarized from 38 verified reviews · Updated September 2026
Clients consistently praise Diffco for strong technical expertise across mobile, backend, and AI development, alongside reliable delivery on time and budget. The team is noted for excellent communication, proactive problem-solving, and attention to detail throughout projects. Reviewers highlight the company's ability to understand client needs, integrate seamlessly with existing teams, and deliver high-quality solutions that balance immediate requirements with long-term strategic thinking.
✦ AI-generated summary. May not reflect every review.
Detailed Reviews of Diffco
Services
Sort By
Write a Review

What reviewers mention most

Oleksandr Golovan
Oleksandr Golovan, CBDOVerified Review
Posted on May 6, 2024

“Team augmentation done promptly and perfectly.”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Development

Very positive. They excelled in efficiently filling challenging technical positions. The reduced time to fill positions and improved quality of candidates were standout results of this successful collaboration.

Anonymous
AnonymousVerified Review
Posted on Apr 30, 2024

“Thanks Diffco for amazing work”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web DevelopmentSoftware DevelopmentIT Services

Diffco efficiently managed the recruitment and onboarding process for our company by initially gathering detailed requirements about our values and needs, then selecting, scoring, and interviewing candidates before arranging client interviews, and finally facilitating hiring, onboarding, and ongoing performance monitoring, all with timelines ranging from a single day to one month for each stage.

Anonymous
AnonymousVerified Review
Posted on Apr 9, 2024

“IT Staff Augmentation for Web Development project”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
IT Services

Diffco supplied us with a UI/UX Designer and Web Developer to assist with developing and supporting our Contentful CMS and website. Shortly after contacting Diffco, they promptly presented us with skilled candidates perfectly suited to our needs. This saved us significant time and resources on candidate search and interviews, enabling us to kickstart and launch the project as scheduled

Christopher Villamarin
Christopher Villamarin, FounderVerified Review
Posted on Dec 28, 2023

“The best in the business”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentWeb Development

Throughout the project, Diffco provided exceptional services in UI/UX design, web development, and app creation, employing the latest technologies. Their project management style was notably efficient and adaptive, consistently meeting deadlines and responsively addressing our needs and scope changes.

Lilia Borisova
Lilia Borisova, head of operations at AerostarterVerified Review
Posted on Jul 6, 2023

“Great process for development!”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web DevelopmentSoftware DevelopmentApp Designing (UI/UX)

Diffco proved to be an exceptional partner in developing our aviation community marketplace. With their impressive portfolio and extensive experience, they delivered the project on time and exceeded our expectations. Their effective communication and technical expertise make them a top choice for web app development. One aspect that sets Diffco apart is their comprehensive market knowledge and expertise in product development. They provided invaluable insights and suggestions that helped us enhance our offering and tailor it to the specific needs of our target audience. We highly recommend Diffco for their outstanding services.

Anastasiia Yakymenko
Anastasiia Yakymenko, Founder & Talent Acquisition Head at Minds MatchVerified Review
Posted on Jun 19, 2023

“Thanks for development!”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentSoftware DevelopmentApp Designing (UI/UX)

Diffco proved to be an exceptional development partner, creating a user-friendly telehealth mobile solution with a strong emphasis on security and reliability. Their expertise, attention to detail, and commitment to delivering an outstanding product made them a pleasure to work with. I highly recommend Diffco for any organization seeking a trustworthy and seamless development experience.

Yurii Kovalov
Yurii Kovalov, CEO at PFLBVerified Review
Posted on Jun 2, 2023

“AAA+++ Great company and great leadership!”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentWeb DevelopmentApp Designing (UI/UX)AR & VR DevelopmentArtificial Intelligence

As a trusted partner to fintech companies, we engaged Diffco to handle the backend and frontend components of a critical project at our client's banking institution. Diffco's software development team delivered exceptional services, showcasing their expertise in secure backend architecture, robust APIs, and an intuitive frontend interface. We maintained effective communication throughout the project through regular remote meetings, ensuring transparency and collaboration. Diffco's Agile project management style ensured prompt delivery of milestones. We were particularly impressed by their innovative approach, customer focus, and operational efficiency, which aligned perfectly with our partnership values.

Pavel Shpin
Pavel Shpin, CIO at GlobalizeVerified Review
Posted on May 1, 2023

“Trusted technology partnership”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentApp Designing (UI/UX)Artificial Intelligence

Having had a positive collaboration with Diffco before, I had no doubts about their proficiency in delivering the services my client needed for their project. It was a pleasure working with them again and seeing their expertise in action. They have given us a detailed approach that follows industry standards and best practices, and thorough testing to ensure the system works properly. We're happy with the outcome.

Anonymous
AnonymousVerified Review
Posted on Apr 13, 2023

“Professionalism and dedication to delivering high-quality work”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Development

Overall, Diffco's exceptional professionalism, dedication to delivering high-quality work, and ability to adapt to our needs made them stand out from other companies. Their project management style was well-managed, meeting deadlines, and exceeding expectations.

Don Markland
Don Markland, CEO at Accountability NowVerified Review
Posted on Apr 13, 2023

“Amazing e-Platform Work”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentWeb Development

They were communicative, consultative and helpful. They went above and beyond all the way. What an amazing team. I will work with them again and again.

Emil Sildos
Emil Sildos, Chief Revenue Officer at FlashGrid Inc.Verified Review
Posted on Jan 11, 2023

“Wonderful team, quick assistance, great communication and well developed product.”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Development

We approached Diffco a couple of years ago to help us refresh our website and branding. The team is very dedicated; they took ownership of the project, meanwhile, all of our requirements concerning the product and marketing strategy were addressed. With the company, we reached our goals, as the new website turned out very intuitive and easy to navigate, precisely what we asked for. Since our partnership went so effectively - we decided that all support and updates tasks should be maintained by Diffco ever since. Moreover, the team has built a custom Zendesk-based solution, that includes a knowledge base and support ticketing system. This platform ensures well grounded support for our clients with easy maintenance, scalability, and reliability.

Ruslana Golunova
Ruslana GolunovaVerified Review
Posted on Dec 1, 2020

“Outstanding mobile app development team”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App Development

Diffco team developed a bundle of two iOS mobile apps for us - one app was for vets and one for pet parents. The apps included many useful features, such as online communications via messages, convenient examination forms, secure architecture, reminders, financial statistics, etc. We enjoyed working with Diffco. The team is highly professional with strong experience in mobile app development.

Ivan Petrushin
Ivan PetrushinVerified Review
Posted on Nov 18, 2020

“Many years of successful partnership”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Development

"I'm the CEO of Questroom - an immersive escape room and entertainment company based in Los Angeles. We hired Diffco to develop a website and a custom ERP platform that would include a booking system, customer feedback aggregation, business process automation, and statistical analysis. We needed an exciting and memorable website with an attractive and emotional design, which would express the client's experience in our quest rooms. We also needed a custom ERP platform that would perform all our business processes, from the booking interface for users to order and room management system with statistics and business metrics monitoring. The first version of the platform was successfully released within 3 months and was integrated into our business processes. This helped us optimize our internal business operations processes, increase our business activity, and acquire more clients. I was impressed by how good the development and communication processes were organized. They replied very fast to all questions and requests. The solutions they developed work very well and are exactly what we were looking for."

Stas TVerified Review
Posted on Nov 10, 2020

“The first-class software development team”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App DevelopmentSoftware Development

Intreamatic - a Voice AI platform for dialogue advertising. We hired Diffco to develop a new partner mobile SDK for our AI platform, which helps with easy and quick integration of Instrematic solutions into our clients' products. Diffco also performed a technical audit and analysis of our current SDK and provided their solutions and ideas that help in making the new SDK great. The development process was very effective and transparent. We were impressed by Diffco's approach to the development process and how they engineer new solutions. They look upfront, learn your product and strategy to develop more sophisticated and functional solutions.

Sergey Snezar
Sergey Snezar, CEO at at DevMindVerified Review
Posted on Nov 6, 2020

“Reliable team with strong technical expertise ”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Mobile App Development

I'm the CEO of Devmind, the software development consultancy and software integration company. Diffco developed a back-end software for a digital content distribution platform created for our client, one of the major European airline companies. We needed to develop a reliable, autonomous, easy to integrate and maintain solution, that would work on remote infrastructure and perform all operations with deploying digital content on airplanes during their maintenance in airports. The project consisted of multiple subsystems developed by different teams. Diffco had excellent processes and standards in place, which made work with them easy and comfortable. They also have excellent technical expertise, which gave me the confidence to rely on them when choosing the right technologies and approaches. Together with Diffco, we successfully launched the first version of the full platform in 5 months and performed an integration in one of the client's locations. After this, the platform was successfully deployed to other airports and continue to update and maintain.

Focus

Service Focus of Diffco

How the team's effort is distributed across services.

40%40%10%10%

Industries Focus

15%15%10%10%10%10%10%10%5%5%

Client Focus

Small Business20%
Medium Business45%
Large Business35%

The Positioning

AI Tools & Purpose

The stack the team uses to move faster.

Claude
AI agent development and engineering copilot
Internal AI harness tool
Develop enterprise ready systems with AI
ChatGPT
Using Codex together with Claude
Gemini
Using for research and for the intergrations
Perplexity
Research and verification
Selected Work

Client Portfolio of Diffco

Where their work concentrates - by industry, budget, and timeline.

Project Industry

Consumer3%
Travel10%
Other10%
Gaming3%
Enterprise7%
Retail3%
Advertising & Marketing3%
Fintech10%
Social7%
Productivity3%
Healthcare7%
Government3%
Education7%
Banking3%
Manufacturing7%
Real Estate7%
Industrial3%
Business Services3%
Major industry focus
Travel

Project Cost

Not Disclosed47%
$100001 to $50000053%
Common project cost
$100001 to $500000

Project Timeline

Not Disclosed30%
1 to 25 Weeks57%
26 to 50 Weeks13%
Typical timeline
1 to 25 Weeks

Clients: 12

QuireShiftAmerican ExpressMARSStarbucksWhole FoodsMazeHappierLegion FarmNokiaHiltonMultiverse

Portfolios: 30

Executive Interview

Executive Interview of Diffco

Vadim Peskov
Vadim Peskov
CEO & Co-Founder
Visit Profile

Please introduce your company and your role within the company.

I am Vadim Peskov, CEO of Diffco US. Our company develops stunning websites and addictive mobile applications for our clients. At Diffco US we turn mobile app and website ideas you dream up into great looking products utilizing years of experience and industry leading technologies. Whether you are a start-up ready to move forward from the whiteboard stage or an enterprise in the middle of a project that needs expert help, we will become your extended team that moves quickly to deliver the optimal solutions. Our services include web and mobile design, iOS and Android development, software development, MVP for start-ups and product consulting, as well as technical support. With offices located in the USA and Europe we service clients worldwide and deliver outstanding results, meeting even the most extreme deadlines.

Mention the objectives or the parameters critical in determining the time frame of developing a mobile application?

It depends on what stage you are right now. An idea, a sketch, a detailed technical task with mock-ups of UI or even completed design of all screens. We work with different clients on every stage of readiness. Also it depends on the amount of work you need for prototyping, designing, coding. Besides, complexity of the application, amount of functions, and integration with a variety of APIs have a direct impact on the time frame.

How much effort in terms of time goes into developing the front end and back end of a mobile application?

Of course it depends on complexity of the application; in general, an average business app development takes 2-3 months to launch. If it requires more time, it means that too many functions have been included into the first version or MVP, so we offer our client to split the launch on stages and move some functions on to the next version.

What is your company’s business model?

We have in-house team, because it provides us with trusted and high quality professionals, as a result, we can rapidly plug into every project.

How is your business model beneficial, from a value addition perspective, to your clients as compared to other companies' models?

We do not only develop applications, we also help the start-ups with the business strategy of the product and we have local expertise in the US market. So we are not just about app development, we are about maximal benefits for our clients.

What are the key parameters to be considered before selecting the right platform for a mobile application?

First, we identify the target audience for the app, how people will use our app, where and in what circumstances. In addi7on to that we specify our client’s goals and plans, understand why we make this applica7on, only after that the platform can be chosen.

Which platform do you suggest your clients to begin with when they approach you with an idea (Android or iOS) and why?

It depends on the app, but in general for US market we recommend to start with iOS, because of its popularity, limited amount of mobile models and opportunity of monetization.

Android or iOS, Native or Hybrid — which platform is best to use to build your app? What are your recommendations?

If you have very limited time to launch and you definitely have to start with both platforms, you are forced to use cross platform solutions. In other cases, we recommend first to develop one native app and then work on another platform. Native app usually works better and gives the users satisfactory experience, which is very important to present your business idea. In the long run, we generally recommend moving on the native app, so it’s a good investment of time to start with the native app.

What are the key factors that you consider before deciding the cost of a mobile application?

It’s simple. We compose a detailed feature list of an application and estimate every item in hours. So we get a detailed total estimate on of the whole app.

What kind of payment structure do you follow to bill your clients?

It depends on the project and the negotiations with the client. Usually we try to meet the client’s requests on the payment structure.

Do you take in projects which meet your basic budget requirement? If yes, what is the minimum requirement? If no, on what minimum budget you have worked for?

It varies from project to project, however we recommend the budget of $15k for MVP.

What was the cost bracket of mobile app projects your organization did in 2015?

The cost of projects that we did in 2015 varied from $10k to $100k+.

Trust & Safety

Verified business

Goodfirms confirmed Diffco's legal identity, ownership and registration before verifying the profile.

Business verified by Goodfirms
Verified on Jul 30, 2026 · Goodfirms Trust & Safety

Registered entity

Legal nameDiffco US inc
Entity typeINC
Incorporated2015 · 11 yrs
LocationSan Jose, CA, United States
CountryUnited States

What Goodfirms verified

Diffco US inc
Company registration confirmed against public records
Registered business address
Address verified with supporting documents
Beneficial ownership
Ownership disclosed and reviewed
Authorized representative
Representative's identity confirmed
Supporting documents
Incorporation and ID documents checked

Ownership and identity documents were reviewed privately by Goodfirms and are not published. Personal details of owners and representatives are kept confidential.

Where we are

Locations (1)

Offices where Diffco operates.

Headquarter
United States

United States

333 W San Carlos St Suite #600
San Jose, California 95110
+14156551002