Full-Stack Engineer: APIs + React UI (Hybrid Role)

State Street; Kraków; Hybrid; PLN 164,000 - 200,000; Full time

Benefits offered by this job

Permanent contract from day one

Birthday Day Off

Gold Medical Package for employees and

families

Premium life insurance

Private pension plan

Training and development programs

Volunteer time off

Well-being programs

Seniority-based additional benefits

Job summary

State Street Kraków seeks a Front-to-Back Full-Stack Application Developer focused on the services layer and a React UI. You will design, build, and maintain REST/GraphQL APIs, integrate with data stores, and collaborate across teams in a hybrid work setup.

The role emphasizes secure, scalable backend and a responsive frontend using React.js and TypeScript, with integration to various databases and messaging systems. State Street offers a permanent contract and extensive employee benefits.

Qualifications

• Bachelor’s degree in a technical field is required.
• 8–10 years of relatable experience.
• Hybrid work model in Kraków, Poland.
• Experience building service layers and APIs with modern stacks.

Responsibilities

• Design, build, and maintain service-layer components (RESTful APIs/GraphQL).
• Implement authentication/authorization, validation, error handling, and API contracts.
• Develop data access/persistence with SQL/NoSQL; optimize performance.
• Build integration patterns (Kafka/MQ) as needed.
• Develop UI with React.js, TypeScript, and modern state management.

Skills

Node.js (Express/NestJS)

TypeScript

React.js

REST/GraphQL APIs

SQL/NoSQL databases

Kafka/MQ integrations

Authentication/Authorization

Testing (unit/integration)

CI/CD & DevOps

API integration patterns

Education

B.S. degree in Computer Science, Engineering, Mathematics, or Physics

MS degree preferred

Tools

PostgreSQL

SQL Server

MySQL

MongoDB

Kafka

Docker

NestJS

Job description

State Street Kraków seeks a Front-to-Back Full-Stack Application Developer focused on the services layer and a React UI. You will design, build, and maintain REST/GraphQL APIs, integrate with data stores, and collaborate across teams in a hybrid work setup.

The role emphasizes secure, scalable backend and a responsive frontend using React.js and TypeScript, with integration to various databases and messaging systems. State Street offers a permanent contract and extensive employee benefits.