Senior Full Stack Developer (Java + JavaScript/TypeScript)

Quick Facts

• Role: Senior Full Stack Developer (Java + JavaScript/TypeScript)

• Work model: Remote (up to 2 visits per month to the Wrocław office)

• Employment: B2B

• Rate: 145–160 PLN/hour

• Project: Energy-sector business application based on interactive diagrams and graphs

Description

You will develop and maintain a business application for the energy sector where interactive diagrams and graphs are central. The role covers both frontend and backend development, including API and integration service design, while working closely with a business analyst and maintaining high code quality and security. Because the project involves critical infrastructure, Polish citizenship is required.

Responsibilities

• Design, develop, and maintain complex business applications with the frontend layer
• Create application APIs and design integration services
• Support the business analyst in designing UI screens using the company Design System
• Address non-functional requirements and ensure solution security
• Design, implement, and optimize algorithms used in the application
• Analyze functional requirements and prepare implementation plans
• Collaborate with other IT teams to ensure smooth system integration
• Maintain high code quality and accurate project documentation
• Track progress and work in an Agile, multidisciplinary team

Requirements

• At least 7 years of commercial software development experience
• At least 5 years with JavaScript, TypeScript, and React
• At least 3 years programming in Java (including Quarkus and Spring Boot)
• At least 3 years practical experience with GoJS (or comparable diagram/graph tools)
• Very strong knowledge of frontend ecosystem, architecture, and design patterns
• Experience with Oracle databases, SQL, and PL/SQL
• Knowledge of REST API, SOAP, and frontend-backend integration
• Practical experience with Git, Docker, Jenkins, Maven, and NPM
• Experience writing automated tests, performing code reviews, and optimizing performance
• Polish citizenship (mandatory)

Benefits

Not specified in the provided posting.

Nice to Have

• Experience building advanced graphical editors, process modelers, or dependency visualization apps
• Advanced GoJS capabilities (custom templates, layouts, rendering optimization for large diagrams)
• Experience with large graph structures and UI performance optimization
• Knowledge of Angular, WildFly, Java EE, or Jakarta EE
• Knowledge of PostgreSQL or MySQL
• Experience designing application architecture and modernizing existing systems
• Experience with industrial or energy systems with high reliability requirements