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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

Eugene Tsaplin

CEO & AI Solutions Architect

Leads AI product discovery, architecture and delivery. Helps founders turn ideas into secure MVPs, bringing together AI agents, RAG, SaaS and automation, and overseeing projects from initial consultation through production deployment.

Valerii S.

Valerii S.

Data Engineering & AI Integration

Builds web scrapers, data pipelines, API integrations and SaaS products. Connects AI tools to practical workflows, with experience spanning structured data extraction, backend development, database design and deployment into production systems.

Grigory M.

Grigory M.

AI Solutions Architect & Delivery Lead

Turns business objectives into clear AI requirements and delivery plans. Guides projects from discovery through launch, aligns clients and engineers, and defines quality checks for reliable AI outputs and production readiness.

Maria M.

Maria M.

COO & Business Development

Supports business development, marketing and operations for growing organizations. Works with leaders and stakeholders on market research, outreach, product launches and process improvements, helping connect commercial goals with practical day-to-day workflows.

Meet 9 more engineers
Andrey I.

Andrey I.

Senior Backend & Data Engineer

Builds backend and data systems with Python, Node.js and SQL. Combines cloud architecture, API integration and analytics with experience translating business requirements into technical plans and coordinating cross-functional engineering work.

Vlada S.

Vlada S.

Python Developer, Scraping & Automation

Develops Python tools for web scraping, automation and data processing. Works with Playwright, BeautifulSoup and Flask to build parsers and web applications, improve existing scripts and deliver clean, maintainable code.

Vladimirs C.

Vladimirs C.

Machine Learning & Computer Vision

Develops machine learning software for image, video and signal processing. Uses Python, PyTorch, OpenCV and scikit-learn for computer vision, recommendation systems, image segmentation and anomaly detection, drawing on practical image-processing experience.

Gleb D.

Gleb D.

AI & Python Engineer

Builds Python applications, RAG systems and AI bots, with experience in Flask, Django and FastAPI. Combines API development and automation with data gathering, web scraping, geospatial modelling and machine learning.

Filipp Z.

Filipp Z.

Python, RAG & ML Engineer

Develops Python and LangChain applications for RAG and machine learning. Builds APIs and data workflows, manages Linux deployments, and contributes Vue.js interfaces, with a background in information security and system integrity.

Nikita S.

Nikita S.

AI & ML Technical Lead

Architects and develops AI systems spanning computer vision, data extraction and voice or text bots. Translates business requirements into technical specifications, leads development teams and guides projects from concept through deployment.

Viktor I.

Viktor I.

Python & Automation Developer

Builds Python tools for data extraction, workflow automation and computer vision. Connects applications through APIs and n8n, prepares datasets, and develops machine learning prototypes for classification, image processing and applied research.

Azizbek R.

Azizbek R.

Fullstack & Automation Developer

Builds web products with React, Next.js, Node.js and PostgreSQL. Develops marketplaces, Telegram Mini Apps and bots, connects payments and CRM systems, and creates n8n workflows and Windows automation in C#.

Harut G.

Harut G.

AI Automation Engineer

Builds AI automation, computer vision pipelines, RAG systems and bots. Combines asynchronous Python services with LLM and hardware integrations, taking projects through clear milestones, deployment and ongoing support after launch.

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

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.