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Oleksandr Subota

@oleksandrsubota

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Senior Software Engineer at LLInformatics (Advarra) who turned a healthcare workflow POC into the production solution.

Poland

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What I'm looking for

I'm looking for remote contract work as an independent contractor, with EU/UK time zone coverage and flexible overlap with North America.

At LLInformatics (client: Advarra), I reviewed a planned healthcare workflow architecture and flagged gaps before implementation. When the approach conflicted with business goals, I built a POC implementing roughly 75% of the missing workflow logic; it became the production solution with minor adjustments.

At Inpay, I implemented core features for a financial crime prevention and AML platform, using Redis PubSub for decoupled internal workflows. I owned the historical data migration, reaching 98% validated field-level mapping accuracy across different data models.

Across healthcare, fintech, and cloud operations, I’ve worked from early requirements through production, including building APIs and integrations, investigating production issues, and improving legacy code when the payoff justifies the regression risk. I also built TargetedCV, a Rails app that analyzes a CV against a job description and tailors it using Anthropic and OpenAI APIs.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

LLInformatics

Mar 2025 - Jul 2026 (1 year 4 months)

Reviewed architecture for a healthcare workflow, built a POC that became the production solution, and designed an OAuth authentication foundation with AWS Cognito.

Ruby on Rails Rack Sidekiq PostgreSQL Redis OAuth Amazon Cognito S3 EFS Datadog Minitest RSpec Git

Career Break: Professional Development

Self-Directed

Jun 2024 - Mar 2025 (9 months)

Planned break for upskilling and side projects focusing on Rails 7, Hotwire, test suite performance, scalability, and decoupled backend designs.

Rails 7 Hotwire Test Suite Performance Scalability Decoupled Backend Design

Senior Developer

Inpay

Sep 2022 - Jun 2024 (1 year 9 months)

Implemented core features of an AML platform, owned historical data migration with 98% field-level mapping accuracy, and rewrote a legacy JavaScript app in React/TypeScript.

Ruby on Rails Sidekiq MariaDB Redis React TypeScript Jest RSpec

Senior Developer

Digicode

Jan 2022 - Jun 2023 (1 year 5 months)

Implemented core features for web and mobile products, removed database query bottlenecks, and worked in a cross-functional agile team.

Python Django PostgreSQL Elasticsearch WebSockets React Native TypeScript Sentry Jest

Lead Developer

Shaving360

Oct 2021 - Jan 2022 (3 months)

Delivered a computer-vision mobile MVP from concept to production in 4 months and ported image post-processing to native Swift.

Python Mediapipe Objective C Swift

Ruby on Rails Developer

Digicode

Apr 2019 - Jan 2022 (2 years 9 months)

Built RESTful APIs and third-party integrations, audited and eliminated N+1 queries, and extracted front-end logic into a standalone React application.

Ruby on Rails MySQL React TypeScript REST APIs RSpec Jest