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Andrei Kaleshka

@andreikaleshka

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Ruby on Rails founder at WideFix, taking ownership of production products and shipping safe, incremental improvements.

Poland

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What I'm looking for

I help founders and small engineering teams take control of existing Ruby on Rails products. I’m interested in work where I can assess architecture, set priorities, and take ownership of shipping practical improvements that make products reliable, easier to change, and ready to grow.

At WideFix, I help founders and engineering teams take control of existing Ruby on Rails applications. I review architecture, identify risks and bottlenecks, and set priorities so the right fixes and improvements get shipped.

WideFix takes ownership of products already in production, including when a previous developer has left or the application has become difficult to change. I focus on practical, incremental improvements rather than unnecessary rewrites.

At Toptal, I worked on full-cycle software development and maintenance for clients across industries including FinTech, EdTech, e-commerce, and logistics. As a Toptal Core Back-end Developer, I integrated payment and accounting systems and extracted the Billing domain into a separate service.

Earlier, I implemented billing and invoicing systems at ActiveCloud and helped deliver mezuka.com at MEZUKA LLC. I also wrote Rake Task Management Essentials for Packt Publishing.

Experience

Work history, roles, and key accomplishments

Current

Founder

Current

WideFix

Jan 2014 - Present (12 years 9 months)

WideFix takes ownership of existing Ruby on Rails applications.

We help founders and engineering teams maintain, stabilize, and improve products that are already in production. Whether the previous developer has left, the application has become difficult to change, or the team needs deeper Rails expertise, we step in, understand the system, set priorities, and keep the product moving forward.

O

Current

Software Solutions Architect

Current

Toptal

Aug 2013 - Present (13 years 2 months)

Full-cycle software development and maintaining software solutions (web/mobile/DevOps) for Toptal clients across a range of industries:
- FinTech: Billing/Invoicing/Payments/Accounting systems
- EdTech
- Entertainment
- E-commerce
- Recruitment and job boards
- Data analytics
- Music and digital content
- Logistics

Development Team Lead

Hubstaff

Aug 2021 - Mar 2022 (7 months)

Worked as Development Team Lead at Hubstaff.

Senior Software Engineer

Hubstaff

Jan 2020 - Jul 2021 (1 year 6 months)

Worked as Senior Software Engineer at Hubstaff.

Back End Developer

Cru

Nov 2019 - Dec 2019 (1 month)

A one-time job:
- Helped to integrate with Adobe Analytics API
- Implemented REST API endpoint to expose this data
- Helped to finish functionality relates to accept payments from the system clients
- Covered existing functionality by unit tests (RSpec)

Software Consultant

MOLINELLI MEDIA GROUP SL

Apr 2019 - Nov 2019 (7 months)

A one-time job:
- Integrated Stripe online payments system to automatically pay invoices that reduced accounts receivable by more than 50%
- Implemented subscriptions system to sell CRM services so that clients know for what they pay, that also increased income
- Improved speed of full text search functionality by more than 90%
- Added functionality allows to manage properties by many staff member

Toptal Core Back-end Developer

Toptal

Jun 2016 - Nov 2019 (3 years 5 months)

- Integrated and maintained Stripe payment system
- Integrated and maintained PayPal payment system
- Integrated and maintained Intacct with the Billing system
- Implemented and maintained invoicing system
- Implemented and maintained accounting system
- Refactored monolithic application so that it's ready for microservices architecture
- Extracted Billing domain to a separate service

Lead Software Engineer

ActiveCloud

May 2013 - Nov 2016 (3 years 6 months)

Build a billing system for clouds from scratch
Implement APS standard for services provisioning
Interviewing candidates to the teammember
Code review and grow the team

Senior Software Engineer Team Lead

Mezuka LLC

Dec 2014 - Jun 2016 (1 year 6 months)

- Analyzed business requirements for the startup
- Integrated Authorize.net online payments system so that customers were able to pay orders online, that improved user experience and the business income
- Implemented invoicing system
- Implemented not trivial full text search functionality for searching pizzerias inside custom map areas, the areas were highlighted on mouseover
- Integrated Twilio

Chief Technology Officer

MEZUKA LLC

Dec 2014 - May 2016 (1 year 5 months)

Implemented a delivery fast food application mezuka.com from scratch
Built a strong team
Took decisions in architecture, code quality, configuration, deployment, business analysis, planning

Senior Software Engineer

ActiveCloud

May 2013 - Nov 2014 (1 year 6 months)

- Implemented billing and invoicing system from scratch
- Implement APS standard (https://www.apsstandard.org/) in Ruby
- Completed dozens of interviews for Ruby developer position

Writer

Packt

Nov 2013 - Apr 2014 (5 months)

Write a book from scratch ”Rake Task Management Essentials” ISBN 978-1-78328-077-3

A book author

Packt Publishing

Nov 2013 - Apr 2014 (5 months)

- Wrote the book "Rake task management essentials"
- Learnt Rake tool in deep

Ruby On Rails Developer

Altoros Systems

Apr 2010 - May 2013 (3 years 1 month)

Development, architecture, deployment, management

Software Engineer

ALTOROS SYSTEMS

Apr 2010 - May 2013 (3 years 1 month)

Take part in development of various outsourcing projects
The most remarkable and successful project is Keenprint
Tutor of interns for an internal course called RubyGardenswherewe have to refactor legacy and apply new UI