Red Black Tree d.o.o.

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Overview

$50,000+

Min Project Size

$50 - $99/hr

Avg Hourly Rate

50 - 249

Employees

2012

Year Founded

ABOUT RED BLACK TREE D.O.O.

Passion for Excellence. We Got IT.

Since 2012, we have been developing software and maintaining relationships with clients from our very first year. We are Red Black Tree, a dedicated software development partner providing comprehensive custom software solutions to clients throughout Europe, the USA, and beyond. Our services cover the entire delivery lifecycle, including architecture, development, testing, maintenance, and IT consulting. What distinguishes us is not the start of our partnerships, but the duration of client relationships. Here are some highlights about RBT: - 14 years in business - 70 software experts - Over 50 completed projects - Average client relationship lasting more than 10 years - Longest client partnership spanning 14 years - Offices located in Belgrade, Čačak, and Novi Pazar Industries in which we excel: - AI & Automation - Energy & EV Charging - Automotive - Healthcare & Medical - FinTech - EdTech

LANGUAGES SPOKEN

EnglishMarshallese

HIGHLIGHTS

$50,000+

Min Project Size

$50 - $99/hr

Avg Hourly Rate

50 - 249

Employees

2012

Year Founded

Services

Focus

Industries

Clients

Services Provided+4 Services

20% Code Review & Technical Audits

65% Custom Web Application Development

15% QA & Software Testing

10% Cloud Consulting & SI

15% Workflow Automation (Zapier / Make / n8n)

10% IT Staff Augmentation

20% AI Model Fine-Tuning & Training

10% Other IT Consulting and SI

About the Team

OUR STORY

Our Narrative: Red Black Tree consists of a dedicated team of 70 engineers and experts, boasting 14 years of experience in creating custom software solutions for clients throughout Europe, the USA, and beyond. We function as a long-term technology partner, immersing ourselves in your challenges, taking responsibility for results, and remaining involved well after the initial delivery. What Makes Us Unique: Carefully selected, senior-level engineers, many with over 20 years of experience across more than 10 industry sectors, fully integrated with your operations, prioritizing security and compliance.

Portfolio

Automated Clinical Reporting System

Problemshared

**Client Overview:** ProblemShared is a digital mental health platform based in the UK that provides online therapy, clinical assessments, and ongoing support after diagnosis, linking patients with specialists across various mental health issues. **Business Problem:** Clinical reports were generated manually in Word documents, resulting in a slow, error-prone process that was hard to scale. Completing a report could take several days, and practitioners had to manually upload the final reports to a third-party healthcare platform, adding unnecessary administrative tasks. As demand grew, these inefficiencies became a significant barrier to clinician productivity and service delivery. **What We Did:** RBT developed a comprehensive digital reporting system that replaced manual processes with a configurable, automated solution. The system is built around a dynamic questionnaire engine that generates reports based on practitioner input, utilizing real-time conditional logic that adjusts questions, answer choices, and report content as users proceed. We integrated automated PDF generation, local report storage, and connection to third-party platforms, removing the need for manual uploads. Throughout the project, we collaborated closely with product and clinical stakeholders and integrated direct feedback from practitioners to ensure the system aligned with actual workflows and supported future expansion. **Outcomes Delivered:** The time required to create reports was reduced from several days to approximately three hours. Human error was significantly minimized, manual uploads were eliminated, and clinician administrative burdens were lowered. The architecture is designed to accommodate an unlimited number of future report types. **Tech Stack:** Python Flask, PostgreSQL, Redis/RQ, Nuxt 2/Vue 2, React/TypeScript microfrontend, AWS/Terraform.

Messaging Architecture Modernization for iMentor

iMentor

**Client Overview:** iMentor is a nonprofit organization based in the U.S. that assists students from low-income backgrounds in achieving success in high school, college, and beyond through mentoring and ongoing support. **Business Problem:** iMentor's platform facilitated connections between mentors and mentees through CMS, web, and mobile applications, but the chat feature became slow and unreliable across all platforms. The primary issue stemmed from an inefficient MongoDB data structure that involved excessive lookups and poorly optimized queries, with some API responses taking as long as 40 seconds. Additionally, the system's reliance on Redis events with large payloads made the messaging framework challenging to scale and maintain. **What We Did:** RBT undertook a complete modernization of the platform's chat architecture. We restructured the MongoDB collections used for messaging, migrated existing data to the new schema, and verified historical records—identifying invalid entries, coordinating cleanup with the Product team, and documenting our findings. To streamline the architecture, we replaced the large Redis payloads with dedicated API endpoints, retaining Redis solely for lightweight real-time activities like new messages, reactions, and status updates. We also addressed UI issues across CMS, web, and mobile platforms to ensure a consistent and reliable user experience. **Outcomes Delivered:** There was a significant enhancement in messaging speed and reliability across all platforms, and severe API delays were eradicated. The data model was simplified and optimized for scalability, while the complexities associated with Redis were minimized. The quality of historical data was improved through validation and cleanup efforts. **Tech Stack:** React, React Native, TypeScript, JavaScript, Axios, Zustand, Rematch — Node.js, MongoDB, Redis, BullMQ, AWS S3, AWS Rekognition.

Customer Portal Modernization for zLinq

zLinq

**Client Overview:** zLinq assists businesses in lowering telecom expenses by assessing and optimizing their telecom bills and expenditures. **Business Challenge:** zLinq’s mission was straightforward: cut telecom costs and enhance transparency regarding savings. However, internal systems hindered their ability to deliver these benefits at scale. Teams dealt with numerous phone numbers, IP addresses, and telecom subscriptions using an outdated platform riddled with inconsistent data, duplicate entries, and slow processing times. As the client base expanded, onboarding became increasingly labor-intensive, managing support workflows grew more complex, and clients faced restricted insight into the savings being created by zLinq. **What We Did:** RBT developed the zLinq Customer Portal—a unified platform that clarified savings while boosting internal efficiency and scalability. For clients, we provided a real-time savings dashboard that offered visibility into telecom assets along with capabilities for search, filtering, reporting, and exporting data. On the operational front, we established internal tools for data management, support account mirroring, audit trails, and standardized onboarding workflows through a customized email editor. Additionally, we incorporated role-based access controls, enterprise-grade security measures, and platform-wide audit capabilities. RBT managed the entire product development process, including architecture, backend and frontend development, and deployment. **Outcomes Achieved:** Continuous visibility of savings through a client dashboard, expedited and standardized onboarding, enhanced support efficiency due to centralized data access, a unified structured platform replacing fragmented systems, and improved security and compliance readiness. **Tech Stack:** Next.js, TypeScript, React, Tailwind, TanStack Query, Chart.js, FastAPI, Python, PostgreSQL, Redis, Auth0, AWS, Docker, Sentry, Terraform, Pandas, Polars.

4 more projects

Projects & Clients

Project Size & Rate

Minimum Project Size

$50,000+

Average Hourly Rate

$50 - $99/hr

Pricing Snapshot

Min Project Size

$50,000+

Avg Hourly Rate

$50 - $99/hr

Cost Rating

N/A

What Clients Have Said

“

"Red Black Tree d.o.o. delivers quality projects within budget and timeline expectations based on verified client feedback."

Based on verified reviews and internal benchmark data

MOST COMMON PROJECT SIZE

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Select a service

Code Review & Technical Audits

Custom Web Application Development

QA & Software Testing

Cloud Consulting & SI

Workflow Automation (Zapier / Make / n8n)

IT Staff Augmentation

AI Model Fine-Tuning & Training

Other IT Consulting and SI

BI & Big Data Consulting & SI

AI Strategy & Roadmap Consulting

Cybersecurity Assessments & Hardening

Business Intelligence (BI) Dashboard Development

Locations

Headquarters

Dvadesetprve divizije 11

Beograd, Belgrade, Serbia 11000

+381600444426

Headquarters

Bulevar oslobodilaca Čačka 30 32000

Cacka, Serbia 32000

+381600444426

Headquarters

Stevana Nemanje 36300

+381600444426

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