Mobile-only
We fully develop and maintain your iOS and Android apps, or work alongside your in-house team on a joint effort.
Custom Software Development with AI acceleration
Web, mobile, and enterprise software that reaches production fast and keeps up as your business changes. Senior engineers decide what to build, and 100+ AI agents per engineer build it around the clock, inside a living plan with automatic checks.
Products we developed are used by
Awards and client reviews
- Top AI Development Company
- Top 10 Software Developers
- Top AI Developers
in California
- Top Staff Augmentation Company
Diffco supplied us with the skilled engineers we needed to meet our ambitious goals. Their account manager proactively addressed concerns, ensuring our expectations were met.
Razvan SpatariuSenior Software Engineering Manager at MultiverseTheir commitment to excellence ensures our platform remains robust and adaptable to our evolving needs. With their expertise, we've successfully enhanced our offerings, making our collaboration highly effective.
Pete GualfettiHead of Design and Integration at Good2GoWe were impressed by Diffco's approach to the development process and how they engineer new solutions. They look ahead, learn about your product and strategy, and develop sophisticated, highly functional solutions.
Stas TushinskiyCEO & Co-founder at InstreamaticDiffco took on a complex financial system build for us — the kind of work that touches fund accounting and compliance, where there’s no margin for error — and they delivered. They helped us shape our AI product strategy rather than just executing tickets. Real ownership of the outcome.
Adam HooksCEO at Vero K12Diffco handled discovery for two complex health tech AI products for us. They’re technically sharp, honest about what’s actually worth building, and easy to work with. They moved fast without cutting corners and understood the healthcare space. Highly recommend.
Mark MagazuPrincipal at M3 Veterinary Innovation AdvisorsDiffco's expertise and engineering approach increase the reliability and efficiency of our IoT infrastructure. Diffco has proven to be a reliable partner with exceptional expertise. I highly recommend their services.
David C ThompsonSenior Digital Initiatives director at ChemTreatThe quality and consistency of the team make Diffco stand out from other vendors.
Art DanielovCEO at FlashgridThey 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.
Don MarklandCEO at Accountability NowDiffco turned our concept into a polished product from scratch, delivering on a tight timeline. Clear communication, organized project management, and a strong mix of creativity and technical expertise produced an app that exceeded our vision.
Mason MeninCo-founder at WYA Group, Inc.
Project Approaches
Mobile + back-end
When your mobile app or web platform needs a back-end, our back-end engineering team builds it: APIs, databases, and infrastructure.
Management or admin panel
User-friendly admin panels for mobile and web applications, reliable and easy to support and extend.
SDKs
We work fluently with the SDKs and libraries of all major platforms, and build our own when your product needs one.
Backend-only
We build the back-end processes that run your business, including operations, accounting, and marketing.
Web
Web applications built by our front-end team, from customer-facing products to internal platforms.
APIs
We integrate virtually any third-party technology through APIs, and design clean APIs of our own.
AI built in
ML, RAG, computer vision, and copilots inside the product, engineered to the same production standard.
What we bring
Tech stack
Frontend
JavaScript
React
Next.js
Angular
Vue.js
TypeScript
Tailwind
Material UI
Bootstrap
Mobile
Swift
Java
React Native
Kotlin
Flutter
Objective C
Backend
Node.js
Nest.js
Express
PHP
Python
ASP.NET
Django
Flask
Ruby on Rails
Sinatra
C#
Symfony
Laravel
Yii
Go
Erlang
C/C++
Scala
Rust
Julia
R
AI models
Anthropic
OpenAI
Gemini
Hugging Face
Mistral
Qwen
Grok
Kimi AI
TypeSafe AI
Open weight models
DevOps
Docker
Kubernetes
AWS
Azure
Google Cloud
ElasticSearch
Apache Kafka
QA
Selenium
TestMu AI
Cypress
JUnit
pytest
RSpec
PHPUnit
Mocha
Jest
JMeter
OWASP ZAP
Diffco AI Methodology
A delivery method built for the AI era, not retrofitted to it.
Code is the cheap part now. Knowing what to build first, which foundation will hold at ten times the users, and what not to build at all is where projects are won.
Senior engineers make those calls. More than 100 AI agents per engineer do the building, around the clock, on our own delivery platform built on Claude Code and OpenAI Codex. A living plan with automatic checks keeps every agent inside the lines.
- You click through your product before we build it
- We bring you the parts of the job you never put into words
- Every architecture decision is written down with the alternatives
- Everything traces back to a goal, which is what makes change fast
- People make the decisions, and AI agents build inside them
- Before release, a person watches it work
- The whole project
is a document you can read
- Read the full methodology
Integrations
Our team has deep experience integrating third-party platforms, products, and services, including:
Payment platforms
Stripe, PayPal, Square, and Authorize.net
CRM systems
Salesforce, HubSpot, Pipedrive, and Zoho
Help desks
Zendesk, Freshdesk,
and Intercom
Communication APIs
Twilio, SendGrid, and
Mailchimp
AI model providers
OpenAI, Anthropic, Google Gemini, and Open Weight Models
How we build
Seven stages, with a person signing off at every gate.
Every project runs through Production-Ready AI Engineering: seven stages, senior engineers directing 100+ AI agents, a check on every save, and a person signing off at every gate.
- 01
Discover
Human + AIWorkshops and stakeholder interviews with AI in the room. It cross-verifies inputs across calls, docs, and Slack threads, flagging blind spots, edge cases, and contradictions humans miss.
- 02
Plan
AIAI decomposes the work, picks architecture, models, and tools. Surfaces risks, costs, trade-offs, and conflicts between stated requirements, before they become bugs.
- 03
Align
HumanYou review and approve. Every decision is logged: an auditable trail before any code is written. No black box, no scope drift.
- 04
Build
Human + AIAI agents execute the approved plan inside engineered guardrails. Senior engineers steer and unblock. Sprint cadence with working artifacts, not status decks.
- 05
Validate
Human + AIThree independent layers on every release candidate: automated evals, senior code review, and dedicated Human QA, with manual and exploratory testing alongside security, performance, and accessibility checks.
- 06
Release
Human + AIProduction deployment, UAT, knowledge transfer, runbooks. Cutover is documented, reversible, and on a schedule you approve. Your team takes the keys, or we operate it for you.
- 07
Evolve
Human + AILaunch is a milestone, not a finish line. Monitoring, feedback loops, and incremental improvements keep the system compounding, and feed the next discovery cycle.
Every later change re-enters the same loop, and nothing skips a step.
Read the full methodologyEngagement models
Ways to work with us
Dedicated Team
Human-led, AI-assisted · Monthly commitment
A senior squad reserved for you on a monthly basis, using AI to move faster. Best for evolving products and complex domains. You get:
A senior team that’s always yours, never reassigned mid-project- Scope and priorities you can flex sprint by sprint
- Predictable monthly spend with no padding for risks you may never use
- Velocity from a team that already knows your codebase
Agent-Led Delivery
AI-built, senior-directed · Monthly commitment
Most of your monthly budget goes into AI agents, with a lean senior team directing and reviewing their work. You get:
- Maximum of your budget working on the build, not on headcount
- Working software at the end of every short sprint
- A preview of what each change touches before it’s built
- Sign-off on every release against standards agreed before coding starts
Enterprise Essentials
Enterprise software has to do four things well before it does anything else.
Built into every project from day one, not added before launch.
Automations
The work your teams repeat is the work software should do. We map the repeated steps, automate the ones that hold up under exceptions, and keep a person in the loop where judgment is needed.
Security
Your security and regulatory requirements go into the plan first, as rules every agent follows and automatic checks enforce on every change, including which models can see your code and what data agents can touch.
Traceability
Each requirement is traced to its code and tests, every change has a dated log of who approved it, and architecture decisions are recorded with their alternatives. The records your change-control and audit reviews ask for are produced as you build.
Data
Organizing, analyzing, and governing data at scale, with clear ownership of what each system can read and write, and secure sharing across teams and partners.
Why teams choose Diffco
The team in the room is the team that does the work
Senior, dedicated teams
Senior experts on every project: AI/ML and software engineers, product and UX designers, and project and product managers. They’re assigned to you and never reassigned mid-project.
Streamlined development process
Agile delivery built on our Production-Ready AI Engineering model, from early PoC to production rollout. Clear gates with your sign-off at each one, so you always know what’s happening and why.
Transparent billing
You always know:
- What you’re paying for
- How time is spent
- How costs connect to delivered outcomes
Audit-ready from day one
Every agent action is logged and every decision is traceable. SOC 2-aligned practices, HIPAA- and GDPR-aware delivery, and full IP assignment.
Clear communication and reporting
From the first workshop to post-launch optimization, you get:
- Direct access to the Diffco team
- Regular progress updates and demo builds
- Clear documentation of decisions, architecture, and metrics
Own it, or let us run it
Knowledge transfer, runbooks, and documented, reversible cutovers if your team takes the keys. Ongoing support, monitoring, and improvements if you’d rather we operate it.
Our clients’ success stories
Success stories of our clients
We lead end-to-end development of an AI-enhanced ERP for U.S. K–12 school districts
We built the AI Moderator that runs Maze’s user research interviews
Full development + AI agentic product discovery
We set up AI-native development across RedTrack’s ad-tracking platform
We’re building Raivan — an AI-powered next-gen veterinary PMS for M3 VIA
We lead end-to-end development of an AI-enhanced ERP for U.S. K–12 school districts
We built the AI Moderator that runs Maze’s user research interviews
Explore our
amazing case studies
Let’s build something
great together.
Frequently Asked Questions
Senior engineers direct more than 100 AI agents that write the code and tests, review each other’s work, and keep the plan current, around the clock, on our own platform built on Claude Code and OpenAI Codex. You decide what gets built; the agents do the typing.
No. Issues surface the moment work is saved, when they are cheapest to fix, and the agents do not stop when the office closes. What disappears is the rework from a requirement that changed in March and was noticed in October.
You do, in full, from the first week. The goals, the specifications, the decision log, and the acceptance standards are yours to keep and take anywhere.
That is a normal event here. We show you what the change touches across everything already agreed and built, you approve, and it gets built.
Yes. We add the plan beside your existing code without touching it, and the checks apply to new work from day one. Older areas come under the plan as you touch them.
They go into the plan first. Your requirements, whether SOC 2, HIPAA, PCI DSS, or your own policies, become rules every agent reads before it starts and the checker enforces on every change, including which models may see your code and what data the agents can touch.
Need other services?
AI & ML DevelopmentML, RAG, computer vision, and copilots, engineered to production standards with Production-Ready AI Engineering.
AI Agents DevelopmentCustom agents and multi-agent systems that do real work inside your CRM, EHR, ERP, and internal tools.
AI-Driven Product DiscoveryTwo weeks to answer “should we build this, and what would it cost to run,” before you spend six months finding out.
Team AugmentationTop 1% engineers, each with 100+ AI agents, embedded in your team and working inside your plan and your rules.
Mobile DevelopmentNative iOS and Android apps, with AI features built in, designed for real users from the first release.
