Sergiu Beşliu - Sr. Software Engineer & Team Lead

Q: Where is Sergiu based?

Sergiu is based in Chișinău, Moldova, Republic of .

Q: What languages does Sergiu speak?

Sergiu speaks the following languages: Romanian (Native), English (Advanced), Russian (Advanced) .

Q: How many years of experience does Sergiu have?

Sergiu has at least 15 years of experience. During this time, Sergiu has worked in at least 4 different roles and for 8 different companies . The average length of individual experience is 2 years and 11 months . Note that Sergiu may not have shared all experience and actually has more experience.

Q: What is Sergiu's latest experience?

Sergiu's most recent position is Sr. Software Engineer & Team Lead at We as Web .

Q: What companies has Sergiu worked for in recent years?

In recent years, Sergiu has worked for We as Web , Teamart Outsourcing , and Artsintez Media .

Q: Which industries is Sergiu most experienced in?

Sergiu is most experienced in industries like Information Technology (IT) , Banking and Finance , and Construction . Sergiu also has some experience in Media, Entertainment and Publishing , Government and Public Administration , and Education .

Q: Which business areas is Sergiu most experienced in?

Sergiu is most experienced in business areas like Product Development , Information Technology (IT) , and Quality Assurance (QA) . Sergiu also has some experience in Project Management .

Q: Which industries has Sergiu worked in recently?

Sergiu has recently worked in industries like Information Technology (IT) , Construction , Media, and Entertainment and Publishing .

Q: Which business areas has Sergiu worked in recently?

Sergiu has recently worked in business areas like Information Technology (IT) and Product Development .

Recommended expert

Chișinău, Moldova, Republic of

Experience

Sep 2024 - Present

1 year 6 months

Chișinău, Moldova, Republic of

Sr. Software Engineer & Team Lead

We as Web

Technologies: Ruby on Rails 5-7, PostgreSQL, JavaScript, Docker, AWS (EC2, S3, RDS, Lambdas, Route 53), Sidekiq, Redis
Upgraded a large Rails application from legacy version to latest stable, increasing performance benchmarks by 35% and eliminating major security vulnerabilities
Increased automated test coverage from 65% to 90%, which reduced deployment incidents by 50% and enabled a move to weekly release cycles
Refactored background job processing and rake tasks, cutting job failure rates by 70% and reducing average incident recovery time from 3 hours to under 5 minutes
Rewrote and optimized Docker configurations, shrinking local developer environment setup from 2 hours to 20 minutes and improving CI build reliability by 60%
Standardized service-layer architecture, which decreased technical debt by 30% (based on internal audit) and accelerated new engineer onboarding by 0%
Led modernization of 2+ legacy codebases, with zero production downtime during migrations
Improved deployment tooling and workflows, reducing environment-related bugs by 80% and enabling faster rollbacks when issues occurred

May 2021 - Sep 2024

3 years 5 months

Chișinău, Moldova, Republic of

Sr. Software Engineer

Teamart Outsourcing

Technologies: Ruby on Rails, OCR.space, RSpec, AWS, PostgreSQL, Sidekiq, Redis
Developed and maintained document digitization features for the construction sector, enabling the automated processing of over 1,500 documents per day and reducing manual data entry by 80%
Improved OCR accuracy by 30% through custom validation, helping to minimize data correction workload for end users
Optimized backend processes, cutting average API response times by 5% and supporting a growing enterprise customer base
Enhanced service reliability by improving Sidekiq job management and AWS S3 integrations, achieving 99.9% system uptime

Jun 2019 - May 2021

2 years

Chișinău, Moldova, Republic of

Sr. Software Engineer

Artsintez Media

Technologies: Ruby on Rails, PostgreSQL, RSpec, Sidekiq, Redis
Developed and maintained document management systems for two state institutions, digitizing and organizing over 100,000 official records
Built and launched a public website for ASEM, integrating a payment API to enable secure online transactions for 10,000+ users
Created user feedback and admin modules that improved daily workflows for staff at several client companies

Sep 2018 - Jul 2019

11 months

Chișinău, Moldova, Republic of

Software Engineer

Academy of Economic Studies of Moldova (ASEM)

Technologies: Ruby on Rails, PostgreSQL, RSpec, Sidekiq, Redis
Developed and supported internal correspondence and monitoring applications used daily by 500+ staff and students
Automated IT workflows and routine tasks, reducing manual intervention by over 60% and improving overall system reliability
Built command-line and web tools to simplify network monitoring and maintenance, decreasing response times to technical issues by 0%

Jul 2017 - Mar 2018

9 months

Kyiv, Ukraine

Software Engineer

Bitsane

Technologies: Ruby on Rails, Blockchain (wallet automation), RSpec, Sidekiq, Redis
Developed core account management logic for a cryptocurrency trading platform serving over 50,000 users
Implemented automated wallet creation and removal, reducing manual onboarding steps by 90% and improving transaction reliability
Integrated the Advanced Cash payment API, enabling seamless deposits and withdrawals for users and supporting increased trading volumes

Jul 2015 - Nov 2017

2 years 5 months

Chișinău, Moldova, Republic of

Software Engineer

Obmen.md

Technologies: PHP, SOAP, MySQL, Ubuntu, NGINX
Sole developer responsible for designing, building, and launching a real-time online currency exchange platform used by over 3,000 registered users
Developed and maintained all core logic, including automated rate parsing (reducing manual updates to zero), secure payment integrations, transaction workflows, and system APIs
Led all testing (with 90%+ code coverage), deployment, and post-launch support activities, ensuring 99.9% uptime and smooth daily operations processing 100+ transactions per day

May 2013 - Mar 2015

1 year 11 months

Kyiv, Ukraine

Software Engineer

LLC IPS RISE

Technologies: PHP, SOAP, MySQL, GIT, Ubuntu
Designed and developed payment gateway APIs and transaction processing systems supporting 10,000+ daily transactions
Led the technical integration of payment solutions for multiple partner companies, accelerating project delivery by 30%
Collaborated with cross-functional teams to ensure system stability and security, reducing payment-related support tickets by 25%

Nov 2006 - Apr 2010

3 years 6 months

Chișinău, Moldova, Republic of

Project Manager

MahjongTime

Technologies: Internal QA tools, Bug tracking, MS Office Suite, Redmine
Managed stakeholder communication, feature planning, and project documentation
Coordinated QA and bug tracking activities between development and support teams
Helped launch new features and supported basic marketing efforts

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (12.5 years), Banking and Finance (4.5 years), Construction (3.5 years), Media and Entertainment (2 years), Government and Administration (2 years), and Education (1 year).

Information Technology

Banking and Finance

Construction

Media and Entertainment

Government and Administration

Education

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Product Development (14.5 years), Information Technology (12 years), Quality Assurance (6 years), and Project Management (3.5 years).

Product Development

Information Technology

Quality Assurance

Project Management

Summary

Results-driven software engineer with 15+ years of experience in backend and cloud systems, specializing in Ruby on Rails, PostgreSQL, Docker, AWS, and Sidekiq/Redis. Proven track record in system modernization, performance tuning, background job optimization, CI/CD automation, and secure API development. Skilled at scaling distributed applications, integrating payment gateways, and improving developer productivity through modern DevOps practices. Adept at collaborating with cross-functional teams to deliver reliable, high-performance, product-driven solutions. Seeking senior or mid-level opportunities in remote-first engineering environments focused on innovation and impact.

Skills

Backend: Ruby, Ruby On Rails, Sinatra, Python (Drf), Rest Apis, Ocr Integration
Front End: Javascript, React, Bootstrap, Tailwind Css, Typescript, Vite
Testing: Rspec, Minitest
Databases: Postgresql (Fts, Gin Query Optimization), Mysql, Redis (Caching & Queues)
Background Processing / Queues: Sidekiq (Rails), Celery
Ci/cd & Version Control: Git, Ci/cd Pipeline Setup, Environment Parity
Architecture & Patterns: Microservices, Monolith, Service-layer Design, Api-first Development
Deployment & Devops: Docker, Ci/cd, Aws (Ec2, S3, Rds, Lambdas, Route 53), Server Setup, Ufw, Traefik, Nginx
Observability & Performance: Scout Apm, Netdata
Other Tools & Skills: Api Documentation (Apipie, Drf Schema), Agile Workflows, Technical/project Documentation, Team Leadership, Project Management

Languages

Romanian

Native

English

Advanced

Russian

Advanced

Education

Oct 2020 - Jun 2023

Academy of Economic Studies of Moldova (ASEM)

Bachelor's Degree in Applied Informatics · Applied Informatics · Chișinău, Moldova, Republic of

Profile

Created

November 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Sergiu based?

Sergiu is based in Chișinău, Moldova, Republic of.

What languages does Sergiu speak?

Sergiu speaks the following languages: Romanian (Native), English (Advanced), Russian (Advanced).

How many years of experience does Sergiu have?

Sergiu has at least 15 years of experience. During this time, Sergiu has worked in at least 4 different roles and for 8 different companies. The average length of individual experience is 2 years and 11 months. Note that Sergiu may not have shared all experience and actually has more experience.

What roles would Sergiu be best suited for?

Based on recent experience, Sergiu would be well-suited for roles such as: Sr. Software Engineer & Team Lead, Sr. Software Engineer, Software Engineer.

What is Sergiu's latest experience?

Sergiu's most recent position is Sr. Software Engineer & Team Lead at We as Web.

What companies has Sergiu worked for in recent years?

In recent years, Sergiu has worked for We as Web, Teamart Outsourcing, and Artsintez Media.

Which industries is Sergiu most experienced in?

Sergiu is most experienced in industries like Information Technology (IT), Banking and Finance, and Construction. Sergiu also has some experience in Media, Entertainment and Publishing, Government and Public Administration, and Education.

Which business areas is Sergiu most experienced in?

Sergiu is most experienced in business areas like Product Development, Information Technology (IT), and Quality Assurance (QA). Sergiu also has some experience in Project Management.

Which industries has Sergiu worked in recently?

Sergiu has recently worked in industries like Information Technology (IT), Construction, Media, and Entertainment and Publishing.

Which business areas has Sergiu worked in recently?

Sergiu has recently worked in business areas like Information Technology (IT) and Product Development.

What is Sergiu's education?

Sergiu holds a Bachelor in Applied Informatics from Academy of Economic Studies of Moldova (ASEM).

What is the availability of Sergiu?

Sergiu is immediately available full-time for suitable projects.

What is the rate of Sergiu?

Sergiu's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.