Sergiu Beșliu
@sergiubeliu
Experienced backend developer specializing in Ruby on Rails.
What I'm looking for
With over 15 years of experience in backend development, I specialize in building and maintaining financial systems, particularly using Ruby on Rails. My expertise includes designing payment APIs, implementing recurring billing logic, and integrating third-party payment platforms. I have a strong background in system optimization and backend architecture, which has allowed me to contribute significantly to various projects throughout my career.
In my recent role as a Senior Software Engineer and Technical Team Leader, I upgraded a large Rails application to the latest stable version, improving performance and security. I have also worked on document digitization systems and developed software for both government and private sector projects. My proficiency with AWS services and modern frontend technologies like Bootstrap and Tailwind complements my backend skills, enabling me to deliver comprehensive solutions.
Experience
Work history, roles, and key accomplishments
Sr. Software Engineer / Technical Team Leader
WE AS WEB
Sep 2024 - Present (10 months)
Upgraded a large Rails application to the latest stable version, improving performance, tightening security, and removing legacy SQL bottlenecks. Improved test coverage and reliability across multiple critical OCR systems, enabling faster deployments and safer refactoring cycles.
Sr. Software Engineer
Teamart Outsourcing
May 2021 - Present (4 years 2 months)
Worked on a document digitization system for construction companies, converting tickets, invoices, and other paper documents into structured digital formats using OCR. Focused on improving digitization accuracy, optimizing performance, and developing new features to enhance overall system functionality.
Sr. Software Engineer
Artsintez Media
Jun 2019 - Present (6 years 1 month)
Worked on several government and private sector projects, including the development of document management software for state institutions. Built and maintained the public website for ASEM, including integration with a payment API.
Sr. Software Engineer
Academy of Economic Studies of Moldova (ASEM)
Sep 2018 - Present (6 years 10 months)
Developed an internal application for monitoring and accounting physical correspondence across departments. Implemented a high-availability network infrastructure to support both online and on-site IT services for staff and students.
Software Engineer
Bitsane
Jul 2017 - Present (8 years)
Contributed to the development of financial account logic for a cryptocurrency trading platform. Implemented features for dynamic wallet creation and removal based on user activity and balance changes.
Software Engineer
Obmen.md
Jul 2015 - Present (10 years)
Designed and implemented the core logic for an online currency exchange platform, including real-time rate parsing and automated rate adjustment based on global currency fluctuations. Integrated multiple payment system APIs to enable smooth deposit, withdrawal, and transaction processing.
Software Engineer
LLC IPS RISE
May 2013 - Present (12 years 2 months)
Participated in the full software development lifecycle, from gathering requirements and writing technical specifications to deployment and maintenance. Worked on the design and implementation of a payment gateway API, including transaction processing, authentication flows, and integration documentation for third-party partners.
Project Manager
MahjongTime
Nov 2006 - Present (18 years 8 months)
Managed communication with stakeholders and investors, ensuring alignment between business goals and product development efforts. Contributed to business analysis and feature planning across multiple development cycles.
Education
Degrees, certifications, and relevant coursework
Academy of Economic Studies of Moldova (ASEM)
Bachelor’s Degree, Applied Informatics
Completed a Bachelor’s Degree in Applied Informatics. Studied various aspects of computer science and its applications.
Tech stack
Software and tools used professionally
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