About Indext Data Lab

Indext Data Lab is a senior data and AI engineering team headquartered in Belgrade, Serbia, working mostly with US companies. You know your market; we build the product and stay on as your engineering team.

Top Rated Plus agency on Upwork · 515 projects · $2M+ billed · 98% Job Success (Oct 2026). Led by Eugene Tsaplin, personally Upwork Expert-Vetted (top 1% of talent).

Discuss your project

How we work

A fixed price for every stage, agreed before we start.

Free 20–30 min call with Eugene Tsaplin, our CEO: your business, your users, your deadline.
Within 2 business days: a written scope and a fixed price for stage one. First stages start from $5k.
A short demo every week. Code and repository in your accounts from day one.
After launch: the next stage with its own scope and fixed price, or a support plan from $750/month (issues flagged within 24 hours, fixed within 2 business days).

Fixed price, one stage at a time

Every stage starts with a written scope and a fixed price, agreed before any work begins. First stages start from $5k. You see a short demo every week, the code lives in your accounts from day one, and you can stop after any stage.

After launch, we stay

We stay on as your engineering team: each next stage gets its own written scope and fixed price. Or choose a support plan from $750/month: issues flagged within 24 hours, fixed within 2 business days.

Meet the people behind the work

Architecture, data engineering, and delivery in one team. We agree the technical lead, responsibilities, and specialists for your project before the work begins.

Eugene Tsaplin

CEO · Senior AI Architect & IT Consultant

Belgrade, Serbia

Upwork Expert-Vetted (top 1% of talent) · Top Rated Plus · 100% Job Success (personal profile, Oct 2026)

Connects business goals to AI architecture.
Takes ideas through prototypes and technical decisions.
Runs the free 20–30 min call with every new client.

Verify on Upwork

Full bio

Senior Architect with 20+ years of experience blending high-level business strategy with deep technical execution to transform concepts into working AI products

Why partners and teams trust him:

Specializes in taking ideas from concept to functional prototype at speed, specifically designing working demos for investors and internal market fit testing
Brings a strong academic research background (verified Scopus ID & h-index) to ensure solutions are built on rigorous methodologies
Native in English and Russian, fluent in German, and conversational in Serbian
Doctor of Business Administration (DBA) specializing in Entrepreneurship

Maria

COO · Your first point of contact

Replies to every new inquiry within 1 business day (US Eastern).
Sets up your call with Eugene and coordinates your project once work starts.

Nikita

AI & ML Tech Lead · Computer Vision & Blockchain Solutions

Tashkent, Uzbekistan

Translates business requirements into technical specifications.
Leads AI implementation and full-cycle projects.

Full bio

Business-minded AI Architect bridging the gap between complex technical implementation and strategic business objectives

Why he’s trusted from idea to production:

Deep technical skill (Python/ML) combined with executive experience (former CCO/CFO)
Proven leadership in Blockchain infrastructure and full-cycle project management
Developing custom models for high-precision tasks, specifically detecting and analyzing intricate symbols within technical blueprints
Translating business requirements into rigorous technical specifications, ensuring that software architecture aligns perfectly with commercial goals

Meet 9 more engineers

Andrey

Senior Backend & Data Engineer · AI Specialist & Technical Consultant

Belgrade, Serbia

Builds RAG, semantic search, and AI integrations.
Designs backend architecture for complex systems.

Full bio

Andrey specializes in AI integration, high-load architecture, and technical delivery for complex business systems

Why you want him on your team:

Proven track record in RAG systems, semantic search, and AI agent solutions for investment and real estate
Experience architecting and monitoring applications handling >600k sessions/hour (OSI, TCP/IP, API)
Former Team Lead and BA/PM capable of translating complex business goals into scalable technical SOPs
Expert in Python, Node.JS, SQL, Grafana, and Metabase

Gleb

AI Solutions Engineer · Data Scientist & RAG Specialist

Budva, Montenegro

Builds RAG systems for information retrieval.
Develops spatial data pipelines and Python APIs.

Full bio

Data Scientist with a background in Earth Sciences, applying rigorous statistical modeling to modern AI and RAG architectures

What makes him exceptional:

Master’s Degree in Earth Sciences (MSU) with strong foundations in geospatial modeling
Designs and implements RAG systems (Ollama, Custom Bots) for high-precision financial data queries and information retrieval
Unique ability to handle complex spatial data pipelines (ArcGIS + AWS), leveraging a background in 3D geological modeling for industrial data projects
Building scalable APIs and web applications using the full Python stack (Flask, Django, FastAPI) to support heavy-duty data processing

Vlada

Python Automation Developer · Expert Web Scraper

Warsaw, Poland

Develops data extraction and automation tools.
Creates maintainable Flask applications and dashboards.

Full bio

Vlada is a versatile engineer delivering efficient data extraction tools and lightweight web applications with a focus on maintainability and usability

Why she's the perfect choice for your project:

Cross-disciplinary background in Engineering and Web Design
Leverages the Flask framework to create lightweight, high-performance web tools and dynamic applications
Expert in database-backed parsing solutions and high-level research projects like AI browser-use automation
Applies strong UI/UX principles to ensure internal tools and dashboards are intuitive and user-friendly
Expertise in analyzing, debugging, and refactoring older scripts to improve performance and maintainability

Vladimirs

Senior Engineer · ML Engineer & Computer Vision Specialist

Rezekne, Latvia

Builds computer vision and machine learning tools.
Works with OCR, document extraction, and anomaly detection.

Full bio

30 years of engineering experience building machine learning and computer vision tools for industrial automation

Why he’s relied on for technical delivery:

Specialist in processing unstructured data: photos, video, sound, and instrument readings
Dozens of successful high-stakes ML projects
Integrating Optical Character Recognition (OCR) into medical systems (EMR) and building apps for PDF data extraction
Specializing in anomaly detection & signal decomposition
Deep expertise in image segmentation, automatic recoloring, and synthetic data generation for training gesture recognition models
Industrial polygraphy used for data & ML solutions

Viktor

Python Developer · Computer Vision & Automation Specialist

Herceg Novi, Montenegro

Develops computer vision and visual automation.
Connects applications and APIs with n8n.

Full bio

R&D-focused engineer combining advanced Computer Vision and machine learning with practical business automation and data extraction

Why he's the specialist you've been looking for:

Designing and implementing ML models for object detection (YOLO) and image processing using OpenCV to solve real-world visual automation challenges
Expert in n8n to connect disparate apps and APIs
Deep experience with Telegram API (Telethon/Pyrogram) and creating custom connectors for third-party services
Bridging the gap between theoretical research and production by building prototypes, conducting experiments, and testing algorithms for applied solutions

Valerii

Machine Learning Engineer · AI & Web Scraping Expert

Warsaw, Poland

Builds scraping pipelines and LLM data processing.
Deploys AI applications with Docker and cloud services.

Full bio

Valerii offers deep experience in web scraping, AI automation, advanced data analysis, and fluency in English and Polish

Why you should hire him:

Creates workflows that not only scrape data but immediately process it using LLMs for grading, classification, and sentiment analysis
Expert in sophisticated scraping pipelines for complex, dynamic websites using Selenium, Scrapy, and Playwright
Designing and deploying AI-powered conversational agents using tools like Voiceflow and custom NLP backends
Ensuring reliability and uptime through Docker on AWS, Azure

Filipp

Python Developer · RAG & ML/AI Solutions Expert

Belgrade, Serbia

Builds document-based RAG and knowledge systems.
Deploys and monitors Python and AI applications.

Full bio

Information Security graduate applying system integrity principles to the development of scalable RAG pipelines and full-stack AI applications

Why he’s your go-to expert:

Expert in implementing scalable RAG frameworks to build document-based query engines and intelligent knowledge bases
Designs powerful "smart" agents (e.g., RSS + GPT integrations) that autonomously process data streams and execute API-driven tasks
Manages Linux server environments to ensure efficient deployment, monitoring, and stability of AI applications.
Experience with Zoho, Hotellook and using AST for code analysis and structured data organization

Aleksei

Python Automation Expert · Data Parsing & Backend Specialist

Belgrade, Serbia

Builds data extraction and backend systems.
Connects APIs and manages structured databases.

Full bio

10-year veteran engineer specializing in heavy-lifting data extraction and streamlining business operations through custom automation

Why he’s trusted to get it done:

Advanced capability in scraping and parsing data from difficult sources, including app store trends (Google Play/App Store) and dynamic web environments
Deep expertise in managing PostgreSQL, MySQL to handle large-scale datasets efficiently
Seamlessly connects disparate business systems and external APIs to create unified real-time business intelligence pipelines
Builds reliable, high-performance backends using FastAPI and Python for scalable enterprise applications

Grigory

AI Business Transformation Engineer · AI Workflow Architect & LLM Specialist

Belgrade, Serbia

Builds LLM workflows with LangGraph and n8n.
Prototypes automation for practical business tasks.

Full bio

AI Architect bridging the gap between complex mathematical models and practical business automation

Why he leads problem-solving efforts:

Expert in Python, LangGraph, and n8n (LLM integration, multi-agent systems)
Specializing in low-code prototyping
3,500+ hours of verified technical delivery
Fluent in English, Russian, and Czech; conversational in Croatian, Slovak, and Ukrainian
Expert in building complex LLM applications to handle autonomous business tasks

Our track record: Top Rated Plus agency on Upwork · 515 projects · $2M+ billed · 98% Job Success (Oct 2026) (opens in a new tab)

Our story

Built in Belgrade, working with US teams

Indext Data Lab was founded in 2021. Our CEO, Eugene Tsaplin, brings 20+ years of software and architecture experience; the team adds backend engineering, data collection, automation and AI integration. Most of our clients are in the US. We take a product from a defined business problem to the first release, then stay on as the client's engineering team.

Tell us what you want to build.

A few sentences are enough. Maria from our team will email you within 1 business day (US Eastern) to set up a free 20–30 min call with Eugene Tsaplin, our CEO. Within 2 business days after the call, you get a written scope and a fixed price for stage one.