Senior Backend Software Engineer @ Starbridge

Starbridge; Polska; Remote; PLN 180,000 - 240,000; Full time

Job summary

A US-based Series A startup is seeking a Senior Backend Software Engineer with strong experience in Java and Kotlin. You will collaborate with a small team to build innovative products from the ground up, integrating with enterprise systems, processing large datasets, and developing systems leveraging LLMs for insights. Candidates should have experience in Enterprise B2B SaaS environments and be fluent in English. This is a remote position based in Poland.

Qualifications

• Senior developer with experience in Enterprise B2B SaaS or big data processing.
• Experience working in small teams and startups.
• Fluency in written and spoken English.

Responsibilities

• Build products from zero to one in a fast-paced startup environment.
• Integrate with enterprise systems and process large data sets.
• Develop systems leveraging LLMs for sales insights.

Skills

Enterprise B2B SaaS experience

Big data processing experience

Kotlin

Java

English fluency

Tools

Google Cloud Platform (GCP)

Google Cloud SQL for PostgreSQL

Firebase

Python

Job description

Senior Backend Software Engineer @ Starbridge

Polska

You might be a fit if you:

• Are a senior developer with Enterprise B2B SaaS experience or big data processing experience in the JVM ecosystem and ideally Kotlin.
• Are excited to roll up your sleeves and work across all parts of the backend, having experience working in small teams and startups, ideally in a fast‑growing startup.
• Ideally have experience with the following stack:
  • Kotlin (BE)
  • GCP
  • Google Cloud SQL for PostgreSQL
  • Firebase
  • Python
• Fluency in written and spoken English.
• Eligibility to Work in the EU: Candidates must hold valid authorization to work in the country where they will be based. At this time, we are unable to offer visa sponsorship or assist with work permit applications.
• Have experience with some of the following (not required):
  • Natural Language Generation
  • Enterprise API integrations
  • Prompt Engineering
  • Large Scale Web Scraping & Parsing

We’re a US‑based Series A startup looking for a remote Senior Backend Engineer (generalist) with strong experience in Java (and ideally Kotlin) to join our early team and help build our product from zero to one. You’ll collaborate closely with other team members on projects that include integrating with enterprise systems, scraping and processing large data sets, and developing systems that enable users to leverage LLMs to generate sales insights at scale—deriving valuable information from millions of public documents.

Requirements: Java, Scala, Kotlin