Senior Full-Stack Developer: API & React (Hybrid)

STATE STREET CORPORATION; Kraków; Hybrid; PLN 164,000 - 200,000; Full time

Benefits offered by this job

Permanent contract from day one

Gold Medical Package

Private pension plan

Training programs

Volunteer days

Flexible work options

Birthday/Anniversary days off

Job summary

State Street Corporation in Kraków is seeking a Full-Stack Application Developer with emphasis on the services layer (backend/API) and a React.js UI. The role is hybrid, blending home and office work to fit project needs.

You will design and build REST/GraphQL APIs, implement auth, data access using SQL/NoSQL, and integrate UI with backend services using TypeScript, Node.js, React, and modern dev practices.

Qualifications

• BS/MS in Computer Science, Engineering, Mathematics or related field.
• 8–10 years of relatable experience.
• Strong understanding of backend service layers and APIs (REST/GraphQL).
• Proficiency with React.js, TypeScript, and modern UI patterns.
• Experience with SQL/NoSQL databases and data modelling.

Responsibilities

• Design, build, and maintain service-layer components (REST/GraphQL) and API contracts.
• Develop Front-End UI features with React.js and TypeScript, collaborating with design/UX.
• Implement authentication/authorization, data access, and reliable error handling.
• Integrate UI with backend services via well-defined APIs and CI/CD pipelines.

Skills

Node.js

React.js

TypeScript

REST/GraphQL APIs

SQL/NoSQL databases

CI/CD / DevOps

English communication

Education

B.S. in CS or related

M.S. preferred

Tools

NestJS

Express

Spring Boot

Docker

Kubernetes

Git

PostgreSQL

Job description

State Street Corporation in Kraków is seeking a Full-Stack Application Developer with emphasis on the services layer (backend/API) and a React.js UI. The role is hybrid, blending home and office work to fit project needs.

You will design and build REST/GraphQL APIs, implement auth, data access using SQL/NoSQL, and integrate UI with backend services using TypeScript, Node.js, React, and modern dev practices.