Software Lead Developer (Python, LangChain, Docker)

Fujitsu; Łódź; On-site; PLN 260,000 - 420,000; Full time

Benefits offered by this job

Relocation Supported

Job summary

Fujitsu Lodz is seeking an experienced LSoftware Lead Developer (Python, LangChain, Docker) to architect scalable backend systems and mentor the engineering team. You will drive performance, security, and reliability while aligning technical decisions with business goals.

Ideal candidates excel in leadership, API-first design, and modern architectures, including event-driven microservices. A collaborative mindset and strong problem-solving skills are essential for delivering high-quality

Qualifications

• Leads cross-functional engineering teams with clarity and empathy.
• Designs modular, testable, and scalable backend systems.
• Advances automated testing, observability and CI/CD practices.

Responsibilities

• Lead architecture and mentoring for backend systems.
• Drive engineering excellence and code quality.
• Collaborate with stakeholders to align technical decisions with business goals.

Skills

Leadership & Collaboration

Software Architecture

Quality & Reliability

Event-driven architecture

Microservices

API-first design

CI/CD

Observability

Performance optimization

Distributed tracing

Tools

Python

LangChain/LangGraph

Docker

Azure AD

GitLab

LangSmith

FastAPI

Pytest

Postgres

Azureite

Poetry

Pydantic

OpenTelemetry

Job description

Job Location: Lodz

Location Flexibility: Primary Location Only

Req Id: 12966

Posting Start Date: 10/6/26

Highly skilled and experienced LSoftware Lead Developer (Python, LangChain, Docker) with a strong background in building scalable, secure, and high‑performance backend systems. Known for exceptional problem‑solving skills, ownership mindset, and a collaborative approach that strengthens team dynamics. Adept at designing modern architecture, mentoring developers, and driving engineering excellence. A true team player who consistently aligns technical decisions with business goals.

Core Competencies

• Leadership & Collaboration
  • Leads cross‑functional engineering teams with clarity and empathy.
  • Coaches developers in coding standards, architecture patterns, and best practices.
  • Facilitates effective communication between technical and non‑technical stakeholders.
• Software Architecture & System Design
  • Designs modular, testable, and scalable backend systems.
  • Experienced in event‑driven architecture, microservices, and API‑first design.
• Quality & Reliability
  • Strong advocate of automated testing, observability, and CI/CD best practices.
  • Brings a quality-first mindset to code reviews and team processes.

Technical Skills

Primary Technologies (Expert Level)

• Python – advanced software design, async programming, performance optimization
• LangChain / LangGraph – building LLM-powered applications, agentic workflows, vector integrations
• Docker – containerization, multi‑stage builds, optimized production images
• Entra ID (Azure AD) – authentication/authorization flows, OAuth2, OpenID Connect
• GitLab – branching strategies, merging workflows, pipelines
• LangSmith – LLM monitoring, evaluation, tracing
• FastAPI – designing high‑performance REST services and backend APIs
• Pytest – unit/integration testing, fixtures, mocks
• Postgres – schema design, query optimization, migrations
• Azureite – Azure Storage emulation for local development
• Poetry – dependency & environment management
• Pydantic – data validation, settings management, typed models
• OpenTelemetry – distributed tracing, metrics, logging

Nice to Have (Working Knowledge)

• Neo4j – graph databases, Cypher queries
• CI/CD Pipelines – design, automation, release workflows

Professional Traits

• Proactive, reliable, and driven by continuous improvement.
• Thrives in collaborative environments and champions team success.
• Communicates complex technical concepts with clarity and confidence.
• Values craftsmanship, clean code, and scalable architecture.
• Enjoys mentoring and helping others grow technically.

Why Fujitsu?

We combine innovation with purpose, empowering you to bring your whole self to work. Join us and help shape a future where technology improves lives.

Ready to start your journey?

Based on Article 24(6) of the Act of 14 June 2024 on the Protection of Whistleblowers (Journal of Laws of 2024, item 928), the employer provides information on the internal reporting procedure in force at Fujitsu Poland Sp. z o.o. The procedure is available at the following links: Internal-reporting-procedure.pdf, Procedura‑zgłoszeń‑wewnętrznych.pdf

Relocation Supported: