Tech Lead FullStack Developer (f/m/x)

Sii Poland; Kraków; Hybrid; PLN 210,000 - 260,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Open and accessible management team

Regular integration events

Job summary

Sii Poland in Kraków is seeking an experienced Tech Lead to guide the design and development of backend services and APIs, contributing to frontend components using Java, Spring, React.js, and TypeScript in a hybrid mode.

You will work in an Agile environment, leading technical teams, delivering end-to-end features, and ensuring production readiness with strong testing, logging, and observability. Docker/Kubernetes and Cloud services are part of the role.

Qualifications

• 8+ years in enterprise application development with backend focus
• Deep expertise in Java and Spring Framework (Boot, Data, REST, Security)
• Hands-on with microservices and event-driven systems
• Frontend contribution with React.js and TypeScript
• Strong automated testing with JUnit and mocks
• Docker and Kubernetes for containerization
• Cloud services development with Swagger/OpenAPI
• Experience in Agile/Scrum using JIRA/Confluence
• Fluent English
• Willing to work from Kraków office twice a week

Responsibilities

• Lead technical teams and provide guidance on best practices
• Design and build backend services and APIs with Java and Spring
• Deliver end-to-end features, with frontend work in React/TypeScript as needed
• Implement microservices and API contracts
• Build integrations using event-driven architecture
• Develop workflow capabilities and integrate into services
• Ensure production readiness with logging, error handling, resilience, observability
• Drive quality via unit/integration testing and code scanning
• Containerize applications and deploy with Docker and Kubernetes
• Work in an Agile (Scrum) model and document processes in Confluence/Wiki

Skills

Java

Spring Framework

React.js

TypeScript

English

Leadership

Agile/Scrum

Tools

Spring Boot

Docker

Kubernetes

OpenAPI/Swagger

JIRA

Confluence

React

TypeScript

Job description

We are looking for an experienced Tech Lead to join our team in Cracow. In this hybrid role, you will lead the design and development of backend services and APIs, contributing to both backend and frontend components using Java, Spring, React.js, and TypeScript. You will work in an Agile environment, collaborating with a talented team to deliver high-quality software solutions. If you are passionate about building scalable microservices and enhancing user experiences, this opportunity may be the right fit for you.

Your tasks

• Leading technical teams and providing guidance to team members on best practices and solutions
• Designing, building, and supporting backend services and APIs using Java and Spring Framework
• Delivering end-to-end features, including frontend work with React and TypeScript as needed
• Implementing microservices and micro-database patterns with clear API contracts
• Building integrations using event-driven architecture
• Developing workflow-driven capabilities and integrating workflow components into services
• Ensuring production readiness through effective logging, error handling, resilience, and observability
• Driving quality through automated unit and integration testing, code scanning, and remediation of findings
• Containerizing applications and deploying using Docker and Kubernetes, supporting cloud services development
• Working in an Agile (Scrum) model and documenting processes in Confluence/Wiki

Requirements

• Minimum 8 years of experience in enterprise application development with a strong focus on backend engineering
• Deep expertise in Java and the Spring Framework, including Boot, Data, REST, and Security
• Hands-on experience with microservices architecture and event-driven systems
• Proficiency in frontend technologies, specifically React.js and TypeScript, to contribute meaningfully to UI development
• Strong automated testing practices, including experience with JUnit and mocking frameworks
• Experience with Docker and Kubernetes for containerization and deployment
• Familiarity with cloud services development and API specification/documentation using Swagger or OpenAPI
• Comfortable working in Agile/Scrum teams using JIRA and Confluence
• Advanced level of English
• Willingness to work from the Kraków office twice a week

Nice to have

• Knowledge of Risk & Compliance domain, ideally Model Risk Management
• Experience with Spring Integration and/or Spring Batch
• Familiarity with WebSockets, SSE, or binary protocols
• Working knowledge of workflow engines/libraries such as BPMN, Flowable, Activiti, or Drools

Job no. JOB-XM9ZV

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care