Senior Software Engineer

LanceSoft Europe; Warszawa; Hybrid; PLN 260,000 - 420,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

LanceSoft Europe is seeking a Senior Java Backend Engineer to join a Warsaw‑based team working on scalable data‑driven applications with GenAI and agentic AI focus. The role focuses on hands‑on Java backend development using Spring Boot and microservices, with opportunities to work on GenAI/LLM projects.

You will contribute to production code, own technical decisions, and engage with stakeholders on data solutions and large‑scale processing. Warsaw-based hybrid role with 3–4 days in the office.

Qualifications

• Strong hands‑on experience with Java development.
• Spring Boot and Microservices expertise.
• Proven production‑quality code delivery.
• Experience taking ownership of technical decisions.
• Background in large‑scale data processing or distributed systems.
• Experience with Databricks.
• Experience with Snowflake.
• Experience building GenAI/LLM or agentic AI applications.
• Familiarity with LangChain, LangGraph or similar LLM frameworks.
• Strong communication with users/stakeholders.

Responsibilities

• Hands‑on Java backend development with Spring Boot and microservices.
• Work on large‑scale data technologies and production GenAI/LLM applications.
• Own technical decisions and collaborate with stakeholders.
• Contribute to agentic AI solutions and data engineering tasks.

Skills

Java

Spring Boot

Microservices

Production-grade code

Independent ownership

Data processing

LangChain

LangGraph

Communication skills

Tools

Databricks

Snowflake

GenAI/LLM

LangGraph

Python

AWS

Job description

Location: Warsaw, Poland (3/4 days WFO Per Week)

Duration: 1-year contract + Extension

Role Overview

We are looking for a Senior Java Backend Engineer to join a Warsaw-based engineering team working on highly scalable, data-intensive applications with a growing focus on Generative AI and Agentic AI solutions.

The role is primarily focused on hands‑on Java backend development, with Spring Boot and Microservices at its core. Alongside this, you will have the opportunity to work with large‑scale data technologies and contribute to production‑grade GenAI/LLM and agentic applications.

• Strong hands‑on experience with Java development.
• Strong experience with Spring Boot and Microservices.
• Proven experience writing and delivering production‑quality code.
• Experience working independently and taking ownership of technical decisions.
• Experience with large‑scale data processing, distributed systems or data engineering.
• Hands‑on experience with one or more of:
• Databricks
• Snowflake
• Experience building production GenAI / LLM-based applications or Agentic AI solutions.
• Experience with an LLM/AI framework such as LangChain, LangGraph or an equivalent framework.
• Strong communication skills and the ability to work directly with users/stakeholders.

Nice to Have

• Experience with RAG, AI Agents or agentic workflows.
• Python experience, particularly in the context of GenAI/LLM solutions.
• AWS or other cloud experience.
• Experience working with high-volume, data-intensive applications.