Digital product development · React · Python · AI

Development that will not become your second headache

Web services, automation, and AI integrations for businesses that need results, not a report on an attempted effort. We work directly with clients and take on white-label subcontracting under NDA, from architecture to launch and beyond.

Discuss the project →View case studies →Bring us in as subcontractors →

How we work

  • Fixed estimate before work begins
  • Dedicated team with no rotation
  • NDA-first white-label subcontracting
ReactPythonAI

Case studies

Projects that keep working after handoff

Real business problems, from logistics to fintech. Some cases are covered by NDA, but we can walk you through the architecture and solution logic on a call.

Logistics management platform

under NDA

Web system for a logistics company: routes, dispatching, deliveries and orders across several regions — in a single interface.

In search terms, this is a custom dispatch management system for a logistics company: routes, deliveries, orders and operational analytics in one workspace.

Built the platform from scratch: architecture, role model, notifications, analytics. From the first diagram to launch.

Next.jsNode.jsPostgreSQLAWS

Budget: on request · Timeline: 12 weeks · Dispatcher cost reduction: up to 28%

A single operating workspace replaced scattered manual coordination: routes, deliveries and bottlenecks are visible in one place, with room to scale across regions.

Curated culture events platform

under NDA

White-label service for companies that want to offer their clients a hand-picked culture programme under their own brand.

This is a custom events discovery platform with filtering, curated lists and export workflows for agencies, membership programmes and branded customer products.

Built the platform with an event database, filters by city, date and category, saved collections and export. Embeds into the client's site, CRM or app — with no trace of the developer.

ReactPythonPostgreSQLTelegram Bot API

Budget: on request · Timeline: 10 weeks · Response time: up to 30 seconds

Now running as a white-label product for a lifestyle agency, with 400+ events added monthly and fast curated recommendations for end clients.

Financial data processing platform

under NDA

A service that gathers financial data on its own, keeps the change history and makes it easy to keep an eye on.

Another way to frame it: a bespoke financial data collection and monitoring system with parsing pipelines, charts and Telegram alerts.

Wired up parsing from external sources, drew the charts, added a Telegram bot for alerts and an admin panel.

PHPWordPressData parsingChart.jsTelegram Bot API

Budget: on request · Timeline: 8 weeks · Data collection: 100% automated

Manual data collection was removed from the workflow: change history is captured automatically and users reach the numbers they need with far less friction.

Portfolio

Live projects

Open work we can show in full — click a project to preview it right here, or open it in a new tab.

Numbers

What the client gets, not just who we are

A quick view of the factors that shape delivery speed, clarity and predictability for the client.

3

engineers in the core team

No anonymous contractor conveyor: full-stack, backend and frontend work as one delivery unit.

1

business day to first reply

Decisions do not sit in approval limbo for weeks: we reply to incoming requests within one business day.

100%

clear code

Architecture that is easy to extend, review and hand over to another team without unnecessary friction.

RU/EN

working languages

Ready to work with both Russian and international clients without extra layers in communication.

What we do

What we build

We take on projects where architectural precision and a real grasp of the business logic matter — not just ship and forget.

Web applications and platforms

We build web services, enterprise systems and online platforms on React and Python, so you own the product instead of renting foreign SaaS that can disappear at any moment.

Automation systems

Internal tools that take routine work off your team: data processing, service integrations, process management — less manual effort where hiring is expensive and the market is short on people.

AI integrations and smart features

We embed language models and ML into real products: classification, semantic search, content generation, auto-replies. The goal is lower team workload without expanding headcount.

Online stores and B2B portals

We launch e-commerce storefronts, dealer portals and custom product catalogs, so sales do not depend on someone else's platform, marketplace limits or sanctions-related risk.

Vendor replacement and migrations

We move processes and data away from foreign SaaS and aging legacy systems into owned solutions, so the business is not exposed to someone else's rules, outages or sudden cost increases.

Customer portals and self-service

We build customer, partner and internal portals to reduce pressure on managers and support teams: statuses, documents, requests and routine actions are available without endless email threads or chat handoffs.

Bots and notifications

Telegram bots, Slack integrations, alerting systems. Faster communication without recurring subscription spend on foreign platforms.

Parsers and data collection

We collect, clean and refresh data from external sources, so your team has current information without downtime risk when a third-party service goes offline.

Support and evolution

We take over existing codebases for support: refactoring, new features, migrations, optimisation — including projects left behind by a previous contractor or a foreign vendor.

Approach

How we work

The principles behind quality, predictability and safe delivery for B2B and subcontracting engagements.

Hand-written code, not generation

Every line is written by a developer — by hand, with the task in mind. We deliberately avoid AI code generation: fewer hidden bugs, cleaner architecture, and someone to answer for every decision.

Business logic before technology

We don't chase trendy stacks. We pick architecture and tooling for the job at hand: easy to maintain a year from now, holds up under load, doesn't turn into tech debt.

Transparent development

Short iterations, regular contact with your team, clear milestones. You see how the work is going — not just the final result.

Data residency and 152-FZ awareness

We account for Russian personal-data requirements at the architecture level and help shape data storage and processing in Russia where that is a hard requirement for enterprise or public-sector projects.

White-label subcontracting under NDA

We work white-label under your brand, do not contact the end client directly, and are ready to sign an NDA before project discussions begin.

Technologies

Technologies

We pick the stack to fit the task. The core is React, Python, PostgreSQL. We extend it when needed.

FrontendBackendInfrastructureDatabases

esav.tech · 3 developers · Moscow

Team

Ekaterina

Ekaterina

Tech Lead • Full Stack Engineer • AI Engineer

I design digital product architecture, integrate artificial intelligence, and build web applications that solve real business needs. From idea to production — with a focus on quality, scalability, and clear solutions.

Dmitry

Dmitry

Backend Engineer • ML Engineer • AI Solutions Architect

I design backend architecture and build intelligent systems that make digital products faster, more reliable, and smarter. I develop AI agents, machine learning solutions, and complex business logic, turning modern technologies into practical tools for people.

Svetlana

Svetlana

Frontend Engineer • UI Engineer

I build modern user interfaces that transform complex technologies into intuitive and user-friendly digital products. I focus on performance, accessibility, and user experience to make interacting with technology feel natural and effortless.

We are a small engineering team working with companies around the world. We design web applications, AI-powered solutions, and automation systems, helping businesses turn ideas into reliable digital products.

We work without rotation or churn — the same team stays with the project from briefing to release and continues on support after launch.

Build · Automate · Innovate

FAQ

Questions we usually answer before kickoff

The common concerns we address for enterprise clients, agencies and partner teams around budget, NDA, 152-FZ and safe project handover.

What does it cost to get a project started?

After an initial call and a short brief, we provide a starting estimate for scope, timing and launch format. For smaller builds this can be a fixed estimate before work begins; for more complex products we usually suggest a phased estimate with clear budget boundaries.

Do you work on fixed price or Time & Material?

We do both. If the scope is clear and requirements are stable, we can lock the estimate and milestones in advance. If the project is exploratory, integration-heavy or expected to evolve quickly, we recommend Time & Material with transparent reporting and agreed control points.

Do you keep data in Russia and account for 152-FZ requirements?

Yes. We account for that at the architecture level. When Russian data residency is a hard requirement, we help shape storage and processing inside Russia, choose suitable infrastructure and avoid compliance risks that would otherwise surface after launch.

Do you take subcontracting work and how do you handle NDA?

Yes. We work as a white-label subcontractor under your brand. We do not contact the end client without alignment, we are ready to sign an NDA before project discussions begin, and we fit cleanly into agency or integrator delivery models.

What if the project needs to be handed over to another team a year from now?

That is exactly why we favour hand-written code, understandable architecture and predictable implementation choices. The project can be transferred without unnecessary pain: no black box, no random code generation and no tangled logic nobody wants to maintain.

Contact

Have a project?

Describe the task and we'll come back with a budget and timeline range, not just an invitation to another call.

A good fit for enterprise projects, tenders and long-term partnerships. We work with legal entities and provide closing documents. We reply within one business day.

We reply within 24 hours. No spam — we only discuss your project.

Or directly:

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