Senior Software Engineer: AI Data Backend & LLMs (Hybrid)

PlayOn! Sports; Poland; Hybrid; PLN 300,000 - 420,000; Full time

Benefits offered by this job

Hybrid/flexible work environment

Company equity (stock options)

Open PTO policy

401K plan with company match

Medical insurance

Dental/vision/life

Job summary

PlayOn! Sports is seeking a Senior Software Engineer to build AI-powered, data-driven services for web experiences used by millions of high school sports fans.

You will join a product team delivering backend features, data modeling, and LLM integrations that power applications and AI-driven experiences. The role emphasizes end-to-end ownership from architecture to observability, with front-to-back responsibility for performance and reliability across the stack.

Qualifications

• 5+ years of professional software engineering experience with backend web applications.
• Experience building production features backed by LLMs or AI integrations.
• Hands-on cloud data warehousing experience (Snowflake or similar).
• Strong skills in C# .NET, Python, SQL, and data modeling.
• Experience with AWS deployments and CI/CD pipelines.
• Knowledge of evaluation frameworks for AI systems and regression detection.
• Solid PostgreSQL experience with performance tuning and data modeling for AI access.

Responsibilities

• Develop AI-powered, data-driven backend features and services grounded in PlayOn data.
• Build and maintain APIs and backend services serving apps and LLMs.
• Design evolving data schemas that support traditional APIs and AI access patterns.
• Own features end-to-end: architecture, implementation, testing, observability, and ops.
• Plan migrations, platform upgrades, and modernization with minimal risk.
• Monitor PostgreSQL workloads and optimize query performance and indexing.
• Define eval suites for production AI features and integrate into CI pipelines.

Skills

Backend development

C# .NET

Python

SQL

REST API design

Data modeling

AWS

PostgreSQL

CI/CD

Git/GitHub

Agile teamwork

Education

Bachelor’s in Computer Science or equivalent

Tools

Snowflake

PostgreSQL

GitHub

REST APIs

Job description

PlayOn! Sports is seeking a Senior Software Engineer to build AI-powered, data-driven services for web experiences used by millions of high school sports fans.

You will join a product team delivering backend features, data modeling, and LLM integrations that power applications and AI-driven experiences. The role emphasizes end-to-end ownership from architecture to observability, with front-to-back responsibility for performance and reliability across the stack.