Open to opportunities

Maxim Portnyagin

@prtngn

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I’m a Senior Ruby/Elixir developer building scalable distributed systems for high-load fintech and logistics.

Montenegro

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What I'm looking for

I’m looking to build and scale distributed backend systems with Ruby/Elixir—owning architecture, improving performance and data stability, and deploying reliably with Docker/Kubernetes in a cross-functional team.

I’m a Senior Ruby/Elixir developer with 10+ years of IT experience, specializing in developing and supporting complex distributed systems. I enjoy taking ownership of architectural solutions, designing core libraries, and improving reliability and speed under real production constraints.

At Samokat, I led backend development and architecture work for a high-volume logistics platform serving dark stores. I developed a video transcoding service to automate content uploads, built platform modules for large-scale photo/video handling (reducing implementation time from 80 to 4 hours per month), and refactored PostgreSQL database interactions to increase upload speed by 3x—while reaching 95% unit test coverage. I also created platform libraries used by 10 other backend teams.

Earlier, at Wellnuts, I redesigned charging-station logic for predictable high-load behavior, optimized Cassandra pagination with timestamp cursors, and improved gRPC communication reliability. At Balance platform, I delivered a notification microservice (email/SMS/Telegram) across banking projects and implemented Telegram integrations for automated notifications. I continue to apply the same pragmatic mindset in Elixir projects like OneDam, a Telegram WebApp CRM with modular backend architecture and queued mass mailing.

Experience

Work history, roles, and key accomplishments

Senior Ruby Developer

Samokat

Sep 2023 - Dec 2025 (2 years 3 months)

Built and supported backend services in Ruby for a logistics dark-store platform with high stability and throughput requirements. Designed internal libraries, optimized PostgreSQL performance, and delivered media upload/transcoding capabilities used across multiple backend teams.

Ruby PostgreSQL Redis Sequel Redlock DDD RSpec S3 Argo Gitlab CI FFMPEG GraphQL Kafka

Backend Developer

Wellnuts

Jan 2022 - Sep 2023 (1 year 8 months)

Developed and optimized high-load IoT backend services for telematics/GPS tracking, covering device interaction and data processing. Worked on performance refactoring and IoT protocol integrations.

Elixir PostgreSQL Ecto Cassandra AWS gRPC GraphQL

Ruby Developer

Balance Platform

May 2020 - Jan 2022 (1 year 8 months)

Built and supported backend systems for a FinTech platform covering credit pipelines, scoring, and internal services. Contributed to refactoring and microservice decomposition, including notification and Telegram integrations.

Ruby PostgreSQL Redis Gitlab CI Docker RabbitMQ Kubernetes

System Administrator/Network Engineer

Various Companies

Aug 2004 - May 2020 (15 years 9 months)

Administered and configured servers, installed new networks, and maintained existing network infrastructure. Supported systems including mail services, web servers, databases, and core networking components.