sergey ggg
@sergeyggg
Senior backend engineer scaling Python services for B2B SaaS and payments—improving latency, reliability, and delivery.
PortugalWhat I'm looking for
I’m a senior backend engineer with 10+ years building and scaling Python services for B2B SaaS and payments. I focus on reducing latency, improving reliability, and shipping features end-to-end with a strong engineering discipline.
At PandaDoc, I influenced backend architecture through monolith decomposition and reliability practices, leading the migration of a core document domain into an independent service. I implemented a structured on-call process and ran a Sentry error-reduction campaign that reduced incoming production bugs by ~40%.
I also drive performance and operational excellence—improving critical document workflows (reducing document send time by ~20%), defining SLOs and error budgets, running postmortems, and training incident response through a “fire drill” program. I build and tune delivery pipelines with GitLab CI (cutting execution time by ~15%) and integrate third-party systems like Salesforce, HubSpot, and Pipedrive.
Experience
Work history, roles, and key accomplishments
Senior Backend Engineer
PandaDoc
Nov 2021 - Present (4 years 8 months)
Influenced backend architecture by leading a migration of the document domain to an independent service, including database schema design and decoupling work. Reduced production bugs and improved performance/latency for document workflows while handling incidents end-to-end and defining SLOs/error budgets.
Senior Backend Engineer
Wargaming
Oct 2013 - Sep 2021 (7 years 11 months)
Developed and operated a payments system using Python/Go, integrating multiple payment gateways (e.g., Adyen and PayPal) and maintaining reliability under load. Split a legacy monolith into microservices, added one-click purchase support, and supported monitoring/alerting for payment flows.
Web Developer
Various Roles
Jan 2009 - Sep 2013 (4 years 8 months)
Provided web development and integration work involving APIs and CMS-based sites, including Joomla and WordPress. Built and supported integrations and delivery of web/CMS features across different roles.
Education
Degrees, certifications, and relevant coursework
Belarusian State University of Informatics and Radioelectronics
2002 - 2007
Studied at Belarusian State University of Informatics and Radioelectronics from 2002 to 2007.
Availability
Location
PortugalAuthorized to work in
Job categories
Skills
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