AI-First Software Engineering Company from Silicon Valley
For nearly two decades, our team has built the kind of software companies depend on: SaaS platforms, web products, mobile apps, and now AI-native systems, for teams from Silicon Valley startups to top U.S. enterprises in healthcare, finance, and other regulated industries.
Diffco pairs engineering depth with product thinking and a proprietary delivery model called Production-Ready AI Engineering. Senior engineers, architects, and product managers decide what to build and how. 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, and every decision that matters is made by a person and stays on record.
- 18+Years building
production software - 1450+Products shipped
- 500+Satisfied clients
- 38+AI products and agents built
or in production in the last year
Top AI Development
Top 10 Software
Developers
Top AI Developers
in California
Top Staff
Augmentation
Company
Top 50
AI Developers
Services we provide
AI & ML Development
Production-ready AI, ML, RAG, and computer vision, integrated into your stack. We build on OpenAI, Anthropic, Gemini, Llama, Mistral, DeepSeek, Qwen, and more, and turn your data into secure, measurable revenue gains, not pilots that gather dust.
LLM
ML
RAG
Computer Vision
MLOps
AI Agents Development
Custom agents, copilots, and multi-agent systems that automate real work: sales, support, ops, research. Production-grade from day one, with guardrails, evals, and observability built in.
AI Agents
Copilots
Multi-Agent
LangGraph
Voice AI
Custom Software Development
Custom software with AI acceleration: web, mobile, and SaaS products engineered end to end, with AI built into every layer when your product calls for it, from conversational UIs to recommendation engines and agent-first workflows.
AI-Native
SaaS
Web
Mobile
Vibecode Rescue
AI-Native Transformation
Turn your engineering organization AI-native without rebuilding what works.
AI Readiness
Context Engineering
Agentic Workflows
Codebase Modernization
AI Tooling
AI-Driven Product Discovery
Validate scope, architecture, and ROI before committing to a full build. Go from hypothesis to a working PoC in 1–2 weeks, with use-case mapping, a data audit, and a costed roadmap.
Use-case mapping
Architecture
Rapid PoC
1–2 weeks
Team Augmentation
We embed top 1% senior AI/ML, full-stack, and product engineers directly into your team, working AI-first by default. Our experts adopt your tools, stack, and culture, adding senior capacity without long hiring cycles.
Cultural fit
Top 1%
Instant hire
Web Development
Modern websites and web apps built by senior teams: fast, responsive, and easy to manage. Add AI agents, copilots, or data integrations when you need them, or simply ship a great website.
Contentful
Magento
WordPress
Shopify
Sitecore
Mobile Development
Native and cross-platform iOS and Android apps built by senior teams. AI features (agents, copilots, voice, computer vision) when your roadmap calls for them, and solid, fast, well-loved apps either way.
Swift
React Native
Flutter
Kotlin
Java
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
Within days, you get a clickable prototype of the whole flow, not a document. Open questions are marked on screen, so they’re settled in week one, not discovered in month five.
- We bring you the parts of the job you never put into words
Our AI agents read everything you have: product, past decisions, call recordings, and notes. Engineers turn it into edge cases, missing states, and open questions, each yours to accept, reject, or discuss.
- Every architecture decision is written down with the alternatives
Costly-to-reverse choices are flagged before they’re made and reviewed by senior engineers for mistakes and over-engineering. Any decision can be revisited months later with its context intact.
- Everything traces back to a goal, which is what makes change fast
Every requirement and every piece of code links to a goal in the plan. When something changes, everything affected is flagged the same day, and you approve the update before we build.
- People make the decisions, and AI agents build inside them
No agent can change a goal, requirement, or rule on its own. Every change has a named owner and a date, and automatic checks block anything that breaks the plan.
- Before release, a person watches it work
For every key user task, you agree on what “working” means before the code exists. At release, it’s demonstrated live and signed off against that standard.
- The whole project
is a document you can readEvery item is marked finished, waiting on you, or needing review, with the decision and evidence behind it. It’s all in plain files that live beside your code and belong to you.
- Read the full methodology
Our values
Clear
communication
Integrity and trust come first. We keep our promises and tell you where things stand, including when the news isn’t good.
Customer-Centric Approach
Your success is the measure. We learn how your business works and build what actually moves it forward.
Innovation
and Excellence
We work at the cutting edge of AI and engineering, and hold every release to a production-ready standard.
Our clients were featured on
Our history
2026
Production-Ready AI Engineering becomes our standard delivery model, with our own AI delivery platform on Claude Code and OpenAI Codex and 100+ agents per engineer. 38+ AI products in production.
2025
Becoming an AI-first development company, leading large-scale systems and startup solutions powered by advanced AI.
2024
Accelerating AI-driven development with complex, large-scale projects. Strengthening our full-stack focus on AI team augmentation to help businesses scale through intelligent automation.
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 methodology
Our executive team
Vadim
CEO
Vadim Peskov
CEO & Co-founder
Vadim is a co-founder of Diffco and an advisor at Alchemist Accelerator and various startups. As an expert in AI-enhanced applications, computer vision, cybersecurity, startups, and product design, Vadim is a frequent speaker at industry events.
Eugene
CTO
Eugene Nasonov
CTO & Co-founder
Eugene is a co-founder of Diffco and an expert in computer science, software development, software architecture, and server infrastructure. With more than 18 years of experience, he has worked closely with both global enterprises and startups.
Paul
VP of Engineering
Paul Shpin
VP of Engineering
Paul brings 25 years of engineering and entrepreneurial leadership to Diffco. A systemic architect and founder behind Roadshow.ai, Consolidesk, and Targetflow, he builds resilient, scalable platforms that turn ambitious business goals into production-grade technology.
Margo
Head of People
Margo
Head of People
With 15+ years across global engineering teams, Margo leads people operations at Diffco — recruiting, onboarding, and growing the senior teams clients depend on. Her deep tech-industry network is how the bar at Diffco stays where it is.
We're a trusted global partner
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.
Diffco 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.
5.0Their 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.
5.0We 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.
5.0Diffco supplied us with the skilled engineers we needed to meet our ambitious goals. Their account manager proactively addressed concerns, ensuring our expectations were met.
Diffco 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.
5.0Diffco'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.
5.0The quality and consistency of the team make Diffco stand out from other vendors.
5.0Diffco 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.
Success stories of our clients
Led Core Platform Development & Supported Product Growth Through Seamless Operations
Their 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. We confidently recommend Diffco for their exceptional support and innovative solutions.
We built the AI Moderator that runs Maze's user research interviews
We've delivered a powerful corporate website for the enterprise segment
The Diffco team studied FlashGrid's product and marketing strategy to make sure all of our requirements were addressed.
We've developed an audio marketing platform with intelligent advertisements
We were impressed by Diffco's approach to the development process and how they engineer new solutions.
Led Core Platform Development & Supported Product Growth Through Seamless Operations
Their 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. We confidently recommend Diffco for their exceptional support and innovative solutions.
We built the AI Moderator that runs Maze's user research interviews
Explore our
amazing case studies
