Client 360 Full-Stack Application Developer (React.js, Javascript, GraphQL), Assistant Vice Pre[...]

Minimum Salary

zł182,004 Annual (minimum salary quoted above applies to the role in the primary location specified. If the candidate ultimately works outside of this primary location, the applicable minimum salary may differ. Salary will be determined based on factors such as the position, type of work performed, individual skills, job description, working hours, diligence, initiative, self-management, length of employment, availability, and the quantity and quality of work delivered, as well as other objective and non-discriminatory criteria relevant to State Street employees. In addition to salary, employees are eligible to be considered for discretionary annual performance-based awards.

What You Will Be Responsible For

Services Layer / Backend (Primary Focus)

• Design, build, and maintain service-layer components (RESTful APIs and/or GraphQL), including domain services, orchestration, and integrations.
• Implement authentication/authorization, request validation, error handling, and consistent API contracts.
• Develop data access and persistence logic using SQL and/or NoSQL stores; optimize queries and data models for performance and reliability.
• Build integration patterns (event-driven, async messaging, batch, streaming) as needed using tools like Kafka/MQ.

UI / Front-End (React.js)

• Develop and maintain UI features using React.js, TypeScript, and modern state management patterns.
• Collaborate with design/UX to build reusable components, ensure accessibility, and deliver responsive experiences.
• Integrate the UI with backend services using well-defined API contracts; implement client-side validation and error handling.

Proficiency In One Or More Backend Stacks, Such As

• Strong experience building service layers and APIs (REST/GraphQL), including secure and scalable design.
• Node.js (Express/NestJS) and TypeScript.
• Java (Spring Boot).
• Solid experience with React.js, modern JavaScript/TypeScript, component patterns, and API integration.
• Experience with databases (e.g., PostgreSQL, SQL Server, MySQL, MongoDB) and data modelling.
• Strong testing discipline: unit testing and integration testing.
• Familiarity with CI/CD, code quality tools, and modern DevOps practices.

What We Value

• Ability to collaborate with stakeholders across functions and geographies.
• Strong analytical skills, with ability to collect, absorb, and analyze information quickly and independently.
• Good written and verbal communication skills (English is a must).
• High level of engagement.
• Willingness to enter into contract for employment.

Education & Other

• B.S. degree (or foreign education equivalent) in Computer Science, Engineering, Mathematics, Physics or other technical course of study required. MS degree strongly preferred.
• Minimum 8-10 years of relatable experience.

We Offer

• Permanent contract from day one.
• Additional holidays (Birthday Day Off, 3rd and 5th year anniversary Day Off).
• Gold Medical Package for employees and their families (partner and children).
• Premium life insurance package and private pension plan.
• Wide range of soft skills training, technical workshops, language classes and development programs.
• Opportunities to volunteer your time to company-driven initiatives, employee networks or organizations of your choice.
• Variety of well-being programs.
• Additional benefits available depending on the seniority of the role.

As an Equal Opportunity Employer, we consider all qualified applicants for all positions without regard to race, creed, color, religion, national origin, ancestry, ethnicity, age, disability, genetic information, sex, sexual orientation, gender identity or expression, citizenship, marital status, domestic partnership or civil union status, familial status, military and veteran status, and other characteristics protected by applicable law.