Looking for a job

Hiroki Arai

@hirokiarai

Senior Backend Engineer at Netguru building Python and Django services, with PostgreSQL-backed workflows and configurable business logic.

Estonia

Message

At Netguru, I design and deliver Python and Django backend features from product discovery through production. I shape domain models and REST endpoints so distributed product teams can iterate while keeping systems maintainable.

At Aiven, I developed Python services and APIs for managed open-source data services, and built PostgreSQL-backed workflows. I improved service efficiency through query analysis, indexing, caching, and response shaping.

At UltimateAI, I built backend services for conversational AI products, connecting APIs with dialogue workflows and business logic. Earlier at UpCloud, I contributed to backend and platform software for cloud infrastructure products, including application services and operational workflows.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Netguru

Jan 2025 - Present (1 year 9 months)

Designed and delivered Python and Django backend features from discovery to production, shaping domain models and REST endpoints. Built and refined PostgreSQL schemas and query patterns, and implemented configurable business rules and decision logic.

Python Django REST APIs PostgreSQL Relational Data Modeling Query Optimization Indexing Business Rules Decision Logic Code Review Remote Collaboration

Backend Engineer

Aiven

Jun 2021 - Dec 2024 (3 years 6 months)

Developed backend capabilities for managed open-source data services, contributing Python services and APIs. Modeled relational data and implemented PostgreSQL-backed workflows, improving efficiency through indexing, caching, and response shaping.

Python APIs PostgreSQL Relational Data Modeling SQL Indexing Caching Distributed Systems Code Review Documentation

Backend Software Engineer

UltimateAI

Jun 2018 - May 2021 (2 years 11 months)

Built backend services for conversational AI products, connecting APIs with dialogue workflows and supporting business logic. Developed and maintained Python services and REST interfaces, and strengthened reliability through automated tests and debugging.

Python REST APIs Business Logic Workflow Orchestration Testing Automation Debugging AI Product Integration

Software Engineer

UpCloud

May 2015 - May 2018 (3 years)

Contributed to backend and platform software for cloud infrastructure products, implementing application services and operational workflows. Developed API and database functionality with attention to clear interfaces and reliable error handling.

APIs Database Design Error Handling Performance Optimization Debugging Cloud Infrastructure