State Street

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

Poland · Work style not stated · Full time

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About the role

Description from the employer’s posting. Check the employer’s page for the current version.

EmployerState Street
LocationPoland
Work styleWork style not stated
Employment typeFull time
Employer posted20 Aug 2026

Think start-up energy, backed by enterprise scale.

We are building a modern platform within a global organization—combining the agility, ownership, and engineering freedom of a start-up with the stability and funding of an industry leader. You’ll work in a highly collaborative, international environment where your contributions directly shape real products used at scale.

Who we are looking for

Full-Stack Application Developer with a strong emphasis on the services layer (backend/API, integration, reliability) and a React.js UI.

This role can be performed in a hybrid model, where you can balance work from home and office to match your needs and role requirements.

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

Show full description

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

These skills will help you succeed in this role:

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, and Physics or other technical course of study required. MS degree strongly preferred.
Min. 8-10 years of relatable experience.

Minimum Salary:

zł182,004 Annual

The 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.

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

About State Street

Across the globe, institutional investors rely on us to help them manage risk, respond to challenges, and drive performance and profitability. We keep our clients at the heart of everything we do, and smart, engaged employees are essential to our continued success.

We are committed to fostering an environment where every employee feels valued and empowered to reach their full potential. As an essential partner in our shared success, you’ll benefit from inclusive development opportunities, flexible work-life support, paid volunteer days, and vibrant employee networks that keep you connected to what matters most. Join us in shaping the future.

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.

Discover more information on jobs at StateStreet.com/careers

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