Vertical Unit

Complex digital products, enterprise systems, and AI agents — built end to end

We build fault-tolerant web platforms, move legacy systems onto modern tech, and automate the routine with AI. Continuous testing at every stage keeps the system stable and your data safe

We work remotely with clients across Europe and the US. We reply within one business day

Discuss your project & get an estimateMeet the team

A coordinated team of experts. Architect, developers, and a QA engineer work as one unit. Everyone clearly owns their part

Built for the business. We don't just write code — we turn your business requirements into reliable solutions that help the company grow

Turnkey delivery. We take on the whole cycle — from the initial design and launch to ongoing technical support

What we build for your business

We cover the whole product — from architecture and a heavy backend to AI automation and the QA that keeps it standing

Web platforms & complex services
We design and build large-scale client apps, customer portals, analytics dashboards, and corporate platforms. We optimize the underlying architecture so the service stays fast even when user numbers spike
TypeScriptReactNext.jsNestJSNode.js
Backend & data architecture
We build reliable internal logic and set up data storage the right way. Caching, tuned queries, and well-designed databases cut server load several times over and speed up response
PHP (Laravel)C# (.NET Core)PythonPostgreSQLRedis
AI agents & process automation
We build and ship multi-layer systems powered by AI. Our AI agents aren't just chatbots — they're autonomous assistants that process data, handle conversations, and automate sales. We design them to protect your system's core from external manipulation
PythonAPI integrationAI systemsClaudeCursor
Quality control & security
We protect the product from bugs and vulnerabilities before launch. End-to-end testing of the logic and strict access control minimize the risk of leaking trade secrets or your clients' data
Test automationPlaywrightRestSharpNUnitSecurity review

How we work

Transparent and free of red tape — you see progress every day and talk to the team directly

1
Analysis & design
We dig into how your business actually works before the first line of code: gather inputs, ask the right questions, draw a clear technical map, and write the spec without the bureaucracy. From that you get a clear estimate of timeline and budget
2
Working version (MVP) & an open format
We set up the databases, auth, and the product's key features. For every project we open a dedicated chat with the team: you talk to the developers directly, hand over access, and see daily progress — no broken telephone. Engineers keep the technical chatter to themselves; you only get what matters. You receive the first working builds early, so you can adjust in time
3
Change management
New ideas and needs that weren't in the original spec always come up. Our project manager logs them, estimates the cost, and helps fold them into the work in progress — without stopping development
4
Testing, optimization & launch
We cover the system with automated tests, check performance under load, and set up automatic deployment to the server. You get a finished, tested product with built-in protection

Our case studies

Most of our projects are under NDA, so we describe the essence of the work and the results without internal details. What's public we link. Want to know more — let's get on a call and talk through the cases

Full-cycle work on an international ESG platform
We came in as an embedded team on a large international climate-tech / ESG platform with carbon accounting — backend, product front-end, and QA/security in one contour. A heavy backend under load with tenant isolation, a React product surface, and an automated testing + security layer guarding every release. Under NDA, so shown without internal details
.NETReactPostgreSQLQA automationSecurity
transparenterra.com
A core for a multi-agent AI network
A live product (hex-nest.com): a distributed inference network where operators run nodes and clients order AI work from a single balance. We designed the core architecture and the API layer — JWT-signed prompt envelopes that shield the models from injection, an MCP / A2A / REST integration surface, and a Python code-sandbox running inside the agent rooms
Node.jsExpressPostgreSQLJWT SecurityMCPAI agents
QA and content automation for a green-commerce platform
A sustainable-commerce / green-commerce platform. We owned QA and security — functional testing, access-control and tenant-isolation checks — and built content agents that generate posts and auto-publish them to social networks on a schedule
QASecurityPythonAuto-postingAI
greenifai.shopping
A business ERP: leads, inventory, fleet, AI assistant
A multi-tenant ERP for running a company end to end: project and task tracking, leads, tickets, document storage, email campaigns, inventory and fleet management, plus a built-in AI assistant with chat
TypeScriptReactNestJSPostgreSQLAI assistant
Our own task tracker with time-tracking and invoicing
An internal project and task tracker we built for ourselves: projects and tasks with action history, time tracking, GitLab / GitHub integration, auto-generated invoices and reports, and docs and whiteboards inside every project
TypeScriptReactNestJSGitLab / GitHub APIPostgreSQL
An AI assistant with memory that lives in your work chat
A character-driven AI assistant embedded straight into a team chat: a RAG persona, long-running memory with a self-written diary that carries context across quiet periods, image understanding, and proactive check-ins. It also runs a project board — it picks up tasks from plain conversation, sends a morning digest, and nudges on stale ones, all timezone-aware — plus web search and the ability to orchestrate other services and agents. A deterministic intent layer wraps the model so actions fire reliably
PythonLLM + visionRAGTask automationIntegrations
A content bot: scheduled social posting, moderation, payments
An operator-side bot that runs a channel and cross-posts to social networks on a schedule. In a curator mode it drafts and brainstorms posts with web search and image understanding; a multi-layer moderation stack (block-lists plus a vision classifier) filters everything before it goes out, and a persistent registry stops it repeating itself. It also handles payments, tiers and access control, with a strict wall between the public and operator sides and a queued, progress-aware UX. Platform-agnostic — the same logic drops onto whatever messenger or channel you run
PythonAuto-postingContent moderationPaymentsAccess control
An AI voice agent that makes real sales calls
A voice bot that places and handles phone calls in a natural, human-sounding voice — fired straight from a CRM card: it dials, runs the conversation grounded in your sales playbook, handles objections, and writes the outcome back to the CRM. The voice is nearly indistinguishable from a human one — no two calls sound the same, it pauses naturally and can be interrupted mid-sentence (barge-in), blending pre-recorded lines with live synthesis. Multilingual, CRM- and telephony-agnostic, and it follows up with the same leads over messengers in a cascade. The brains run on a cloud LLM or your own GPU
PythonDjangoRealtime voiceCRM + telephonyOmnichannelMultilingual

Who will work on your project

A small team where everyone owns their part: the project manager keeps structure and deadlines, and you talk to the developers directly

AG
Alexey Goryainov
Lead Developer & Systems Architect

Experience: 7+ years designing application backends and multi-service systems

Focus: Bringing order to architecture, moving legacy software onto modern tech, tuning databases for heavy load, and integrating AI

PHP (Laravel)C#Node.jsPostgreSQLRedisClean Architecture
LinkedIn
EB
Egor Bekker
Full-Stack Developer

Experience: Building web apps from scratch — from designing the internal logic to the final user interface

Focus: Expert in TypeScript development, with Web3 products, blockchain platforms, and e-commerce automation behind him

TypeScriptReactNext.jsNestJSExpressDockerWeb3
LinkedIn
AB
Artem Bondarenko
QA & Security Engineer

Experience: 5+ years in quality control for complex web products and distributed systems

Focus: Deep testing of backend logic and APIs with a focus on data security. Sets up leak protection and checks the strength of authorization barriers

C#/.NETNUnitRestSharpPlaywrightTest automation (CI/CD)
LinkedIn
VG
Victoriya Goriainova
Project Manager & Business Analyst

Experience: Running IT projects end to end: gathering and structuring business requirements and coordinating team development

Focus: Initial task audit, locking down agreements, and change management during development. Owns clear communication, deadlines, contracts, invoices, and billing

Project managementBusiness analysisChange managementDeadlines & budgetContracts & billing

Calculate your project cost

Get a preliminary project estimate in a few clicks. We'll discuss the details with you on a call and follow up with a final quote

Project type
Your idea or task
Add-ons
Urgency
Describe your task and hit Calculate
Discuss an exact quote

* Ballpark estimate. We confirm the exact scope, timeline, and price for your task — for free

Frequently asked questions

Do you sign an NDA?
Yes — we can sign your NDA before any details are shared. Most of our own work is under NDA, and we treat access and data accordingly
Who owns the code?
You do. After payment the code, repositories, and all rights belong to you; we can work in your repos and your infrastructure from day one
How do payments and contracts work?
A standard contract with our registered company in Serbia (ALEXDEV, Novi Sad), work split into milestones, and invoices payable by bank transfer in EUR or USD
What about time zones?
The team works from Europe (CET). We overlap comfortably with both EU and US working hours and reply within one business day
How fast can you start?
Usually within one to two weeks after we agree on the scope. A small pilot or an audit can start even sooner
What if a bug shows up after launch?
Code we wrote ourselves is covered by a lifetime warranty — hidden defects are fixed for free, with no time limit

How we handle support: we split the responsibility

Lifetime warranty on our code
$0
We stand behind the quality of our work, architecture, and the tests we write. If a hidden error or internal bug ever turns up in code we wrote ourselves, we fix it — free, with no time limit. The warranty covers our own code only; it doesn't include third-party systems or other people's products taken on for rework
Annual premium support (SLA)
The digital world changes daily: external services update their rules, AI models change response formats, and your databases grow with your client base. Under the subscription we take on adapting the system to outside changes, watch server load, help wire up new integrations, and roll out small improvements quickly

Let's talk about your project

Got a large task, an automation project, a legacy system that needs optimizing, or a product to improve? Describe the idea — we'll come back with a clear technical answer: how to set up the process, a rough timeline, and the best plan to launch the first version

vertical.unit.rs@gmail.com

Got a project? Write to us — let's talk it through

vertical.unit.rs@gmail.comLinkedIn