Senior Backend Engineer — Lead Scalable E‑commerce Microservices

Peloton Interactive; Warszawa; On-site; PLN 250,000 - 420,000; Full time

Job summary

Peloton Interactive is seeking a highly accomplished backend software engineer to lead and build scalable, customer-facing backend services across web, retail, and other sales channels. You will be a hands-on technical lead shaping fast, reliable execution and strategic technical decisions.

You will mentor engineers, work in an agile, cross-functional environment, and own end-to-end feature delivery while contributing to a culture of growth and learning.

Qualifications

• 6+ years of software development experience with leadership over delivery of high-impact projects.
• Proficiency in Java, Kotlin, or Python.
• Experience building and scaling RESTful microservices.
• Familiarity with Kafka, Amazon SQS and data stores like PostgreSQL, MongoDB, DynamoDB, Elasticsearch.
• Experience with Spring Boot, Docker, Kubernetes.
• Unit testing / Test-Driven Development.
• Cloud experience (AWS/GCP).
• Mentoring junior engineers and cross-functional collaboration.
• Knowledge of GraphQL and monitoring tools like DataDog.
• Agile mindset and end-to-end feature ownership.

Responsibilities

• Be a hands-on technical leader delivering small to large initiatives.
• Guide the team in strategic technical decisions for fast, reliable execution.
• Work in an agile environment with peers to scope, develop and deliver software that aligns with product strategy.
• Foster an inclusive culture focused on growth and learning for engineers and non-engineers.

Skills

Leadership

Java/Kotlin/Python

End-to-end ownership

Agile mindset

Mentoring

Cross-functional collaboration

Tools

Spring Boot

Docker

Kubernetes

RESTful microservices

Kafka

Amazon SQS

PostgreSQL

MongoDB

DynamoDB

Elasticsearch

GraphQL

DataDog

AWS

GCP

Job description

Peloton Interactive is seeking a highly accomplished backend software engineer to lead and build scalable, customer-facing backend services across web, retail, and other sales channels. You will be a hands-on technical lead shaping fast, reliable execution and strategic technical decisions.

You will mentor engineers, work in an agile, cross-functional environment, and own end-to-end feature delivery while contributing to a culture of growth and learning.