Serbian Post's First Robotic Sorting System by Libiao | 3D AI-Powered Automation

Project Overview

Serbian Post (Pošta Srbije), the national postal operator of Serbia, has deployed Libiao Robotics' 3D AI-powered yellow robot sorting system across five sorting hubs covering all major postal regions of the country — marking a defining moment in the history of Serbian postal infrastructure. Published in June 2025, this case study documents the first-ever robotic sorting system deployment in Serbian Post's history, a national-scale automation program that transforms the country's parcel sorting capability from manual operations to an AI-powered automated network.

The deployment's scale is significant: five hubs, 321 robots in total, nationwide geographic coverage, and a technology standard that is consistent across every site. The Belgrade hub — the largest in the network — operates 153 yellow robots on a single-layer scalable layout specifically designed for rapid capacity upgrades. Each of the four regional hubs operates 42 robots, providing robust automated sorting capacity across Serbia's major postal zones. Every platform integrates high-precision ±30g weighing systems and runs on Libiao's in-house battery management, navigation, and communication technology for stable 24/7 operation.

The cultural significance of the achievement is reflected in a remarkable recognition: Libiao's yellow robots were featured on Serbia's official commemorative postage stamp marking the country's 185th anniversary — an honor that underscores the national importance of this technological milestone.

Technical Solution

Libiao Yellow Robot 3D Sorting Platform

The core technology deployed across all five Serbian Post hubs is Libiao Robotics' yellow robot sorting platform — the company's signature AGV-based sorting system, described as "3D AI-powered" in the case study. Each yellow robot operates autonomously on the sorting grid, carrying a single parcel from the induction point to its designated sort destination, navigating using Libiao's in-house AI navigation system.

The "3D" designation refers to the platform's multi-level expansion capability — the sorting grid can be expanded vertically to add layers as throughput requirements grow, multiplying capacity within the same footprint. At the Belgrade hub, the current deployment uses a single-layer layout, with the infrastructure specifically designed to support rapid upgrades and layer additions as parcel volumes increase. This scalability architecture is a deliberate investment in future capacity, ensuring that the Belgrade hub can grow with Serbia's e-commerce trajectory without requiring a new facility or a replacement system.

Key Features

First Robotic Sorting System in Serbian Post's History The historical significance of this deployment is explicitly highlighted in Libiao's case study framing. For an institution with the operational history of a national postal service, deploying its first robotic sorting system represents a fundamental shift in operational philosophy — from a labor-dependent manual model to an automated, technology-driven platform. This milestone positions Serbian Post as a modernized postal operator capable of competing in a market increasingly defined by automated logistics providers.

Five-Hub National Coverage The five-hub deployment covers all major postal regions of Serbia, ensuring that the automation investment delivers national-scale impact rather than a single-facility improvement. This geographic completeness is a strategic differentiator: it means that every parcel entering the Serbian Post network — regardless of origin or destination — passes through an automated sorting hub, delivering consistent speed, accuracy, and traceability across the entire national service.

Belgrade Hub: 153 Robots, Scalable Architecture The Belgrade hub's 153-robot fleet is the largest single-site deployment in the Serbian Post network, reflecting the capital region's dominant share of Serbia's parcel volume. The single-layer scalable layout is an investment in future flexibility: as Belgrade's parcel volume grows with e-commerce adoption, the hub can add layers and robots without replacing the base infrastructure, protecting the initial capital investment while providing a clear path to capacity expansion.

321 Total Robots Across the National Network The combined fleet of 321 yellow robots across five hubs represents a substantial automation investment that delivers national-scale sorting capacity. This fleet size positions Serbian Post with automated throughput capability comparable to postal operators in more advanced European markets, closing the automation gap that had developed as private logistics providers invested ahead of the national operator.

​±30g Weighing Precision The high-precision weighing capability integrated across all five hubs ensures accurate parcel processing and billing at every point in the national network. This precision standard is particularly important for Serbian Post's commercial customers — businesses that ship large volumes of parcels need confidence that weight-based billing is accurate and consistent, and the ±30g standard provides that assurance.

Commemorative Postage Stamp Recognition The recognition of Libiao's yellow robots on Serbia's official 185th anniversary commemorative postage stamp is a remarkable cultural acknowledgment of the technology's national significance. Postage stamps are among the most deliberate expressions of national identity and pride — their selection reflects what a country considers worthy of commemoration. The inclusion of the Libiao yellow robots on Serbia's 185th anniversary stamp signals that the automation of Serbian Post's sorting infrastructure is understood as a national achievement, not merely an operational upgrade.

Results & Benefits

The Serbian Post deployment delivers benefits at two levels: operational outcomes for Serbian Post as an institution, and national-level outcomes for Serbia's postal infrastructure and e-commerce ecosystem.

Operational Outcomes for Serbian Post:

• First automated sorting capability in the institution's history, enabling throughput and accuracy levels not achievable with manual operations
• 24/7 operational capacity across all five hubs, eliminating the shift-based throughput constraints of manual sorting
• Consistent ±30g weighing accuracy across the national network, improving billing reliability and reducing revenue leakage
• Scalable infrastructure at the Belgrade hub providing a clear path to capacity expansion as parcel volumes grow
• Standardized technology platform across all five hubs simplifying operations, maintenance, and staff training

National-Level Outcomes:

• All major postal regions of Serbia covered by automated sorting — national-scale modernization rather than a single-facility improvement
• Improved service quality for businesses and consumers across Serbia's geography
• Competitive repositioning of the national postal operator relative to private logistics providers
• National milestone recognized through official commemorative stamp — a symbol of Serbia's technological modernization

Challenges & Solutions

The central challenge of this deployment is the complexity of a national multi-hub rollout — five sites, distributed geography, varying throughput requirements, and the operational continuity requirements of a national public service institution. Unlike a single-facility deployment where all implementation complexity is concentrated in one location, a five-hub national program requires coordinated implementation across multiple sites while maintaining existing postal operations throughout the transition.

Libiao's standardized platform architecture addresses this complexity by minimizing site-specific variation: the same robot hardware, the same control software, and the same in-house technology systems are deployed at every hub, with only the robot count varying by site to match local throughput requirements. This standardization reduces implementation risk, simplifies commissioning, and enables the operational team to develop expertise that transfers across all five sites rather than building site-specific knowledge at each location.

The in-house technology stack is particularly important in the context of a national postal operator's reliability requirements. Serbian Post cannot accept downtime — postal service delivery commitments require continuous operation, and any system failure at a sorting hub creates service disruption that affects businesses and consumers across the region. By controlling all three critical operational systems (battery management, navigation, communication) in-house, Libiao eliminates the external dependencies that are the most common source of unplanned downtime in automated sorting systems.