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Igor Pertsav

@igorpertsav

Senior backend engineer at GRESB building financial-data services and reporting that cuts preparation time sevenfold.

At GRESB, I own backend architecture and technical direction for core Rails services on a financial-data SaaS platform. I designed and scaled analytics pipelines handling 500k records a day, improving processing time and reliability by 70%.

I built AI-assisted reporting that cut report preparation time roughly sevenfold, along with predictive scoring that reduced manual effort by 57%. I also own architectural decisions for the reporting domain, including design reviews and code quality.

Earlier, at Itransition, I owned payment flows and third-party integrations and built a SaaS platform serving 45M+ users. At BESK, I designed microservices and event-driven workflows, helping scale the platform while maintaining high availability.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

GRESB

Mar 2021 - Present (5 years 7 months)

Own backend architecture and technical direction for core Rails services of a high-throughput financial SaaS platform. Designed and scaled analytics pipelines handling 500k records/day, improving processing time and reliability by 70%.

Ruby on Rails PostgreSQL MySQL Redis Sidekiq REST APIs Microservices Event Driven Architecture AWS Test Driven Development RSpec Factory Bot CI CD Datadog New Relic

Senior Software Engineer

IT Territory

Aug 2020 - Feb 2021 (6 months)

Built and maintained transaction-heavy backend systems in a 30+ engineer Agile organisation. Optimised database queries on the hottest read paths, improving response times for high-load transaction processing.

Ruby on Rails PostgreSQL MySQL SQL Redis Sidekiq REST APIs Microservices Event Driven Architecture AWS CI CD Test Driven Development RSpec

Tech Lead

BESK

Sep 2017 - Jul 2020 (2 years 10 months)

Provided technical leadership for a team of 6, owning architecture and mentoring senior developers. Designed a microservices architecture that decoupled core domains and improved release independence.

Microservices Event Driven Architecture Caching Real Time Pipeline Ruby on Rails PostgreSQL MySQL Redis Sidekiq AWS Test Driven Development RSpec

Lead Developer

Itransition

Apr 2012 - Aug 2017 (5 years 4 months)

Owned payment flows and third-party payment integrations, ensuring secure and reliable transaction processing. Built and owned a SaaS platform serving 45M+ users, taking core backend logic from design to production.