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
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What reviewers mention most

Sophia AryanVerified Review
Posted on Oct 14, 2020

“The experienced and reliable software development team”

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

"Simiotics is an MLOPs platform. We were happy to work with Diffco on making our product better. They have great expertise in in AI and web apps development. Diffco team helped us with various AI APIs integrations. Our product required strong skills in working with various APIs, documentation, and building the right architecture for the future. Diffco development process was very transparent and well-organized. Moreover, we liked that Diffco not only develop the product, they also provide very valuable feedback on how to improve our product development strategy. "

Igor Gubernsky
Igor Gubernsky, CEO & Co-Founder at Moscow Gastronomic FestivalVerified Review
Posted on Aug 18, 2020

“Great AI mobile app development”

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

Fredd is a sophisticated and smart product, into which our professional team has put all its experience in the field of haute cuisine and the restaurant business. We wanted to find a team of professionals in mobile development and AI to implement all our ideas at the highest possible level in the form of intelligent algorithms, plus a convenient and functional mobile app with good design. We are delighted to work with the Diffco team. Together with Diffco, we live this product as we discuss, implement and test new functions, to see the app becoming better and better.

Vitaly Kirkpatrick
Vitaly Kirkpatrick, Business Development & Regional Sales Manager at CloviTek IncVerified Review
Posted on Apr 24, 2020

“Great services for an affordable price”

Overall rating5.0
Quality5.0
Communication4.0
Schedule & Timing4.0
Mobile App DevelopmentApp Designing (UI/UX)

I am Vitaly Kirkpatrick, CEO and Founder of CloviTek Inc, the wireless device manufacturing company that builds wireless audio transmitters for streaming audio from TVs over WiFi to mobile devices. I am repsonsible for overseeing the operations, sales and management. Our team had built a hardware device that is capable of streaming audio. We had Engineers who were able to do feasibility testing to make sure that this is something that would be possible to do. However, our Engineers did not know much about mobile app development. We had to look for outside developers to help with the project. We had the challenge to identify the best developers for this technical project out of multiple companies that could offer Linux software development and mobile app development for iOS and Android mobile devices. We wanted the app to be able to receive an audio signal from a TV and decode it in the mobile device so people could use their headphones to hear any TV out of multiple TVs available within one network area. With this solution, our goal was to test the market need for the product so we could go into full production and sales. We worked with a couple of software development teams before. Unfortunately, they under-delivered and their product was not ready for release and sales due to poor design. However, the Diffco team was able to present the solution that had not just functional capabilities we were looking for, but also a modern look and a friendly user interface. It was clear to us, that Diffco team was capable of solving not only technical problems with audio streaming over WiFi, but also user's usability problems which were presented to us in the first design phase. Once we selected Diffco to be our developer, we started the initial design phase. They were very quick in providing their deliveries for each phase of the development. After consulting with us and presenting their UI designs for the mobile app, we moved forward with the mockups development to test the functionality. The app mockups were delivered specifically for iOS and Android platforms within their native frameworks. Those mockups included the company's branding (colors, logos, images, etc.) to match our website, which Diffco developed and built for us as well. From the beginning, I was speaking with the project manager who was very knowledgeable and understood the requirements which he delivered to his team. However, as the development of the project progressed, the team involved the Linux developer and the mobile developer to our remote meetings. Sometimes we needed to talk to their Engineer as well, which they provided to us for solving more challenging problems. After working on the product and mobile app for a year, we had our first prototype developed. We've demonstrated it at various shows and received multiple innovation awards for design, functionality, and usability of the product. When we were able to go online, Diffco team developed our website based on the Shopify platform. We started seeing the sales of the product. However, we could not ship the product yet. Only two years later, with the help of the Diffco team in collaboration with CloviTek's Engineers, we started shipping our first orders to our customers. There were a few issues with the product and the app, which were addressed by Diffco in a timely manner. The Diffco's project manager was located in the U.S., however, their development team was located offshore. The project manager was able to address all of our questions with our management quickly without the need to involve their offshore team to weekly calls. If there were more challenging questions to be addressed by their offshore team, we had in-house team members who spoke their language and were successful communicating issues with the app. A lot of the challenging technical issues with the mobile app were addressed successfully by showing via video recordings or conferences rather than telling about specific issues. I was impressed by their technical knowledge skills their team had. They also know a lot about user experiences. The mobile app had an excellent UI design and functionality. Their biggest strength is they address issues quickly and communicate the outcomes to our team, resolving them if needed. Some of the ideas during the process could have been explored and considered. Because of their own belief that they know the mobile app development best and that they have the technical expertise to solve challenging problems, some of the suggestions were dismissed and never pursued. They are an amazing team and I am retaining them for other projects. But, maybe having an open mind to suggestions could help them in a long time dealing with other customers. Delivering something out of extraordinary and learning something new outside of their comfort zone, would help them develop the skills that maybe other customers would need for other projects.

Ilya Borodach, CTO & Partner at SRG CommunityVerified Review
Posted on Feb 10, 2020

“Great mobile development solution provider”

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

SRG was looking for a technical partner who could develop a unique platform for the a loyalty program to revolutionize the mobile gaming industry. For us, an agile approach to building the infrastructure was important, as well as extensive experience in developing ERP for enterprise clients and custom Fintech solutions. Diffco fit our needs by all the criteria, and we are happy that they become have become OR became part of our team. We especially want to note their well-coordinated team, the willingness to share their ideas, detailed design, and compliance with industry standards. We have successfully developed and launched our product, and we continue to work with Diffco as part of our global strategy and technical support.

AnonymousVerified Review
Posted on Apr 30, 2016

“Satisfied with the quality of software and specialists.”

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

<p>The client is an online community for aviation professionals and provides services to flight schools, flight instructors, pilots and students. The service helps the students and flight schools in finding the right instructor and pilot and also helps the instructors in generating a large pool of students interested in aviation and learning. The client was looking for a right development partner and approached Diffco US to help them with the development of an iOS application as well as a website for the same purpose. The project is being worked upon in a step-by-step process and the first phase is completed within the committed time and budget.</p> <p>The client is highly satisfied with the services of Diffco US and liked that they have strong plans for everything and they offer their clients a lot of options. The client highly recommends them to their colleagues.</p>

AnonymousVerified Review
Posted on Apr 28, 2016

“Great backend development skills.”

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

<p>The client is a digital development firm specializing in native mobile app design and development for iOS and Android (smartphones and tablets). The client was looking for a seasoned development partner that could do heavy-duty backend development. Diffco US was involved in developing the back-end for a police mobile app and also handled the analytics, security checks and upgrades of the architecture. The project is complete and is in post-production phase currently; it was done on time and within budget.</p> <p>The client is very satisfied with the work delivered by Diffco US as they didn&rsquo;t have to worry about the back end at all. The client highly recommends Diffco US to their colleagues.</p>

Valeria Pavlova, Web Content Manager, Online Media at Cyprus InformVerified Review
Posted on Mar 21, 2016

“Reliable and highly recommended.”

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

<p>The client is an Online Media company from Cyprus that provides comprehensive information about Cyprus to people traveling to or setting up their businesses in Cyprus. Diffco US was involved in the development and design of the responsive website for the client.</p> <p>The client is highly satisfied with the services and deliverables of Diffco US and praised them for their professionalism and flexibility to handle everything. The client recommends them highly to their colleagues.&nbsp;</p>

Dimitri Popov
Dimitri PopovVerified Review
Posted on Nov 10, 2020

“It felt like working with an army unit”

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

It felt like working with an army unit

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

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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

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Diffco US inc
Company registration confirmed against public records
Registered business address
Address verified with supporting documents
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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