A small team for an existing product

Rails engineering with clear delivery ownership

Andrei Kaleshka leads technical direction and delivery. We choose the engineers and specialist skills needed for your SaaS, work alongside your existing team or provide the engineering capacity you are missing, and keep maintenance and feature development in one prioritized backlog.

Discuss the team your SaaS needsFractional CTO and technical partnership →

Meet the team

Experienced professionals who take pride in delivering exceptional results for your business

Andrei

Andrei

Founder · Technical lead and Rails engineer

Andrei leads technical direction and delivery, with 15+ years of experience across billing, payments and accounting systems. A Toptal-verified engineer, published author and Ruby open-source contributor, he combines architecture decisions with hands-on engineering.

  • Transforms complex challenges into growth opportunities
  • Builds and leads high-performing teams
  • Published author and recognized industry expert
  • Open-source contributor with 4M+ downloads
Experience in:
FinTechBilling SystemsE-commerceSaaS
Svetlana

Svetlana

Full-stack engineer · Rails, web and mobile

Svetlana works across backend and frontend development using Ruby on Rails, React, Next.js and React Native. She supports product changes across web and mobile interfaces with attention to maintainability and existing workflows.

  • Detail-oriented and highly focused
  • Takes exceptional ownership of every task
  • Dives deep into complex problems
  • Finds thoughtful and practical solutions
Experience in:
MusicEdTechEdTechSaaS
Vlad

Vlad

Full-stack engineer · Rails and React

Vlad builds backend and frontend features with Ruby on Rails, React, Next.js, TypeScript, GraphQL and PostgreSQL. His experience spans FinTech, FoodTech and MedTech, including responsive interfaces for mobile and tablet users.

  • Strong problem-solving mindset
  • Genuine passion for learning
  • Leaves no detail unexplored
  • Go-to expert for complex questions
Experience in:
FinTechFoodTechMedTech
Samuel

Samuel

Rails engineer · Platform maintenance and delivery tooling

Samuel works on Rails product development, platform maintenance and developer tooling. His experience includes building and maintaining complex systems, connecting application changes with dependable delivery workflows.

  • Structured and thoughtful approach
  • Breaks down problems into clear parts
  • Patient and supportive by nature
  • Excellent at explaining technical concepts
Experience in:
FinTechPlatform MaintenanceE-Commerce
Yasir

Yasir

Infrastructure and operations · Application reliability

Yasir supports infrastructure and operations for existing applications. He works with the application engineers on hosting, deployments and operational reliability, keeping infrastructure work connected to product priorities.

  • Communicates clearly at strategic and technical levels
  • Learns quickly and builds context across systems
  • Consistently performs at a high level
  • Takes full ownership from 0 to 100%
Experience in:
Sports Event OrganizationAIMedTechAnalyticsE-commerceFinTech
Anton

Anton

Web platform engineer · Technical leadership

Anton combines deep engineering experience with calm, practical technical leadership. He thinks ahead, strengthens both products and teams, and delivers efficient solutions that remain reliable as platforms grow.

  • 10+ years building scalable web platforms
  • Brings structure and stability to engineering teams
  • Finds simple, smart solutions to complex problems
  • Reliable, thoughtful, and focused on the product
Experience in:
iGamingMVPScalable Web PlatformsedTechSaaS
Lera

Lera

Delivery coordination · Web and mobile products

Lera brings clarity and transparency to complex projects through thoughtful coordination and strong communication. She keeps sight of the bigger picture, takes ownership of delivery support, and helps teams turn business needs into focused, well-organized solutions.

  • Structured, proactive, and attentive to detail
  • Keeps multiple workstreams moving smoothly
  • Communicates openly across diverse teams
  • Turns complexity into clear action plans
Experience in:
HealthTechEdTechCivic TechDigital Products (Web & Mobile)Advertising & MarketingAI

Engineering knowledge, shared

Open source & publications

Alongside client work, WideFix founder Andrei Kaleshka writes about Ruby and builds tools for developers working with existing Rails applications.

Cover of Rake Task Management Essentials by Andrey Koleshko

Published by Packt

Rake Task Management Essentials

Packt approached Andrei after discovering his article on generating Rake tasks. That invitation led to a book sharing his knowledge of Ruby task automation with other developers.

The book explores using Rake to organize and automate development tasks. This is the same area of engineering behind his Rails tooling: making repetitive work easier and helping teams maintain a reliable development workflow.

Published under his earlier name, Andrey Koleshko.

View the book at Packt →Read the article that started it →
Explore recognition & contributions →

Open-source Rails tooling

actual_db_schema

A tool for keeping the local database schema aligned when switching branches in a Rails application.

Explore actual_db_schema →

How a small team supports your SaaS

Technical lead and Rails engineers

Andrei leads application assessment, architecture and priorities. Rails engineers investigate production bugs, deliver backend features and maintain tests and dependencies. We agree who owns each workstream at the start.

Interfaces, operations and coordination

Bring in web, mobile or delivery expertise when the scope calls for it. Keep API contracts, deployment steps and progress updates connected to the Rails work.

Work alongside your team

Agree repository access, code review, release responsibilities, communication cadence and available capacity. Keep the backlog and documentation visible to your internal engineers and founders.

Part-time support for a small SaaS →

Documented client work

Examples of the work we deliver

See how we support existing products through ongoing maintenance, focused performance improvements and delivery across teams.

Worship Online

Maintenance and specialist coordination

Took over an inherited Rails application, repaired defects and expanded test coverage while delivering a redesign. Coordinated specialist expertise around project needs and budget, then continued maintenance and development.

Read the maintenance case study →

CostaDelHome

Rails performance improvement

Supported a busy development team and reduced search page loading from 10 seconds to 100ms. The documented result is 100× faster loading and a 99% reduction in wait time.

Read the performance case study →

Palladium

Rails and GraphQL delivery across teams

Delivered an API and backoffice for a new portal while keeping the existing portal working. Refactored shared backend code, protected data integrity and coordinated dependencies with a third-party team.

Read the API delivery case study →
Discuss your SaaS engineering needsExplore all client work →
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