Dalibor I.

Dalibor I.

Backend Developer

Top performer 9.5/10
Serbia
Trusted member since 2021
20 years of experience

Throughout his career, he has built reliable backend systems, integrations, and APIs across logistics, eCommerce, fintech, and SaaS, combining strong technical expertise with a deep understanding of business needs.

One of his key achievements was developing a public Shopify application for Rapid Logistics Group, where he integrated logistics operations with eCommerce workflows using Ruby on Rails, PostgreSQL, and GraphQL APIs. Despite having no previous experience with Shopify or the logistics industry, he quickly mastered both domains and delivered a solution that streamlined operations and created measurable business value.

Dalibor is known for translating complex business requirements into practical, maintainable software solutions. Having previously collaborated with Proxify, he received outstanding client feedback for his technical expertise, adaptability, and ability to consistently deliver high-quality results.

Main expertise

Ruby on RailsRuby on Rails15 years
RspecRspec15 years
MySQLMySQL15 years
RubyRuby15 years
17+

Experience9

Rapid Logistics Group

Ruby on Rails Developer

Rapid Logistics Group
Transportation and Logistics
Dec 2024 - Jul 2025 · 7m
  • Developed a public Shopify application that integrated eCommerce stores with internal logistics systems, streamlining order management and fulfillment workflows
  • Built scalable backend features using Ruby on Rails and PostgreSQL, ensuring high performance and long-term maintainability
  • Integrated Shopify GraphQL APIs to synchronize products, orders, and fulfillment data across platforms in real time
  • Developed secure integrations with internal logistics systems, enabling seamless data exchange and reducing manual processes
  • Applied best practices in database design, background job processing, and automated testing to ensure production stability and scalability
  • Delivered a solution that automated fulfillment processes, improved delivery accuracy, and enabled the logistics platform to scale efficiently
PostgreSQLPostgreSQL
Ruby on RailsRuby on Rails
GraphQLGraphQL
ShopifyShopify
API
2+
Faktus

Senior Software Engineer

Faktus
Information Technology (IT) and Services
Oct 2023 - Sep 2024 · 11m
  • Developed backend features for a financial platform serving small and medium-sized businesses in the construction industry using Ruby on Rails
  • Built user-facing functionality with Stimulus and Tailwind CSS to improve the customer experience
  • Integrated third-party APIs, automating data synchronization and reducing manual operational effort
  • Optimized SQL queries to improve database performance and application responsiveness
  • Developed automated test suites to improve application stability and support reliable deployments
PostgreSQLPostgreSQL
Ruby on RailsRuby on Rails
RspecRspec
GraphQLGraphQL
SidekiqSidekiq
Shift

Senior Software Engineer

Shift
Automotive
May 2022 - Aug 2023 · 1y 3m
  • Developed and maintained Ruby on Rails APIs supporting the vehicle quoting process for a high-traffic automotive platform
  • Optimized pricing algorithms in Go, improving quote accuracy and the overall user experience
  • Tuned SQL queries to improve database performance and reduce response times under high load
  • Refactored legacy code to improve maintainability, reduce technical debt, and accelerate feature delivery
  • Developed automated test suites to ensure application stability and support reliable deployments
  • Conducted code reviews and mentored team members, promoting engineering best practices and code quality
PostgreSQLPostgreSQL
Ruby on RailsRuby on Rails
RspecRspec
MicroservicesMicroservices
CucumberCucumber
2+
Fair.com

Senior Software Engineer

Fair.com
Automotive
Dec 2021 - May 2022 · 5m
  • Developed and maintained scalable APIs for the checkout platform of an automotive eCommerce application using Ruby on Rails
  • Optimized SQL queries to improve database performance and reduce response times during high-traffic periods
  • Developed automated test suites to ensure application stability and support reliable deployments
  • Participated in code reviews, promoting clean, maintainable code and engineering best practices
  • Collaborated with cross-functional teams to deliver technical solutions aligned with business objectives
  • Transitioned to the Shift engineering team following Fair.com's acquisition, continuing backend development on the automotive platform
PostgreSQLPostgreSQL
RubyRuby
RspecRspec
MicroservicesMicroservices
gRPCgRPC
SidekiqSidekiq
Thinkful

Web Development Mentor

Thinkful
Education Technology (EdTech)
Apr 2018 - Dec 2021 · 3y 8m

As a mentor at Thinkful, an online coding bootcamp, I supported students in mastering software engineering and web development concepts. My role included delivering personalized guidance to help students understand complex topics, complete projects and prepare for successful careers in tech.

I provided additional learning resources, clarified technical challenges and conducted assessments to evaluate student progress. My mentorship extended to career coaching, where I helped students build portfolios and refine their problem-solving skills.

During my time at Thinkful, I mentored over 200 students, achieving a high success rate in job placements. My approach emphasized fostering confidence, encouraging continuous learning and preparing students for the dynamic demands of the tech industry.

AjaxAjax
Bloc

Ruby on Rails Mentor

Bloc
Online Learning and EdTech
Feb 2015 - Mar 2018 · 3y 1m

At Bloc, I served as a Ruby on Rails mentor, guiding students through their web development journeys in one of the premier online coding bootcamps.

My responsibilities included clarifying challenging concepts, helping students complete complex assignments and ensuring they built a strong foundation in Ruby on Rails.

I reviewed projects, provided constructive feedback and taught best practices for developing scalable, maintainable web applications. I also curated additional resources tailored to individual learning needs, helping students overcome obstacles and meet their career goals.

When Bloc was acquired by Thinkful in 2018, I transitioned to their team, continuing my mentorship role with an expanded focus on preparing students for real-world software engineering roles.

RubyRuby
Ruby on RailsRuby on Rails
AjaxAjax
Softserbia

Senior Software Developer

Softserbia
Information Technology (IT) and Services
Nov 2003 - Jan 2018 · 14y 2m

As the co-founder and technical manager of SoftSerbia, I have been instrumental in building one of the first outsourcing companies in Serbia, specializing in delivering tailored software solutions to global clients. My role has evolved over 20+ years, balancing strategic leadership with hands-on technical contributions.

I led the transition to modern frameworks like Ruby on Rails and PHP, enabling the team to deliver scalable, maintainable and high-performing applications. My focus on process improvement resulted in a increase in team efficiency, achieved by streamlining workflows and adopting cutting-edge tools.

A key part of my role involves mentoring a diverse team of developers, guiding them through technical challenges, fostering a collaborative culture and encouraging continuous learning. I designed and implemented robust development methodologies that ensure consistency, quality and innovation across all projects.

As a consultant, I’ve provided expertise in database optimization, API development and SaaS architecture for high-profile clients. Under my guidance, the team has successfully delivered projects ranging from enterprise-grade systems to niche web solutions.

PHPPHP
LaravelLaravel
MariaDBMariaDB
RubyRuby
Ruby on RailsRuby on Rails
5+
AlefBrain

Web developer

AlefBrain
Artificial Intelligence (AI)
Oct 2002 - Oct 2003 · 1y

Simultaneously with my teaching role, I worked as a freelance web programmer at AlefBrain. This position marked my transition into professional software development, where I was primarily engaged in creating dynamic web applications using PHP and MySQL.

I collaborated on several projects, focusing on database-driven applications and user interfaces. My work laid the foundation for my expertise in web development, which I later expanded upon in future roles.

PHPPHP

Research assistant

Faculty of Mechanical Engineering
Education
Nov 1999 - Aug 2005 · 5y 9m

My first professional role was as a research assistant at the Faculty of Mechanical Engineering in Kragujevac, where I balanced teaching responsibilities with participation in cutting-edge research projects.

I taught several technical courses, including Nonlinear Systems of Automatic Control, Measuring Systems and Techniques and Electrotechnics with Electronics. My teaching focused on bridging theoretical knowledge with practical applications, fostering a deeper understanding among engineering students.

In research, I contributed to projects sponsored by the Serbian Ministry of Science, focusing on automotive systems, including active suspension systems and mechanical design improvements. My work re

MatlabMatlab

Engineering excellence

All Backend Developers who have applied to Proxify are scored from 0 to 300 on engineering excellence, one of the five parameters we evaluate. This score reflects engineering excellence only, based on interviews, take-home assignments, live coding sessions, and/or on-the-job performance reviews. The curve shows how all evaluated Backend Developers are distributed across that range, where our acceptance threshold for this parameter sits, and where Dalibor stands.

050100150200250300Engineering excellence scoreShare of engineersmedianmeanProxifyacceptancethreshold
Dalibor
Score 238 · Top 1% of engineers

Portfolio

Highlighted by Dalibor

App4Travel 1
App4Travel

Other projects 3

123 skins
Shift
Faktus

Education

UIK
University in Kragujevac
Faculty of Engineering1996 - 1999

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