Hybrid Full-Stack Engineer: Build Scalable Services & UI

STATE STREET CORPORATION; Kraków; Hybrid; PLN 119,000 - 145,000; Full time

Benefits offered by this job

Permanent contract from day one

Birthday Day Off

Gold Medical Package for employees and

Private pension plan

Well-being programs

Job summary

State Street seeks a Full‑Stack Application Developer with a strong emphasis on the services layer and a React.js UI. The role supports a hybrid work model, balancing home and office work to fit needs and role requirements.

Responsibilities include building service-layer components, API contracts, data access, and UI features with React.js/TypeScript. You will work with Kafka/MQ, CI/CD, and modern DevOps practices in a collaborative, international environment.

Qualifications

• B.S. degree (or foreign equivalent) in Computer Science, Engineering, Mathematics, Physics or related field; MS preferred.
• 3–5 years of relatable experience.
• English required; strong written and verbal communication.

Responsibilities

• Build and maintain service-layer components, 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 stores; optimize queries and data models for performance and reliability.
• Build integration patterns (event‑driven, async messaging, batch, streaming) using Kafka/MQ.
• Develop UI features with React.js, TypeScript, and modern state management.
• Collaborate with design/UX to build reusable components, ensure accessibility, and deliver responsive experiences.
• Integrate UI with backend services via well-defined API contracts; implement client-side validation and error handling.
• Proficiency in one or more backend stacks (REST); secure and scalable design.
• Node.js (Express/NestJS) and Java (Spring Boot).
• Experience with React.js, modern JavaScript/TypeScript, component patterns, and API integration.
• Experience with databases (PostgreSQL, SQL Server, MySQL, MongoDB) and data modeling.
• Strong testing discipline: unit and integration testing.
• Familiarity with CI/CD, code quality tools, and modern DevOps practices.

Skills

JavaScript/TypeScript

React.js

REST APIs

CI/CD

DevOps

Testing (unit/integration)

SQL/Databases

Kafka/MQ

Node.js/Express/NestJS

Java/Spring Boot

Education

Bachelor's degree in CS/Engineering/Math/Physics

MS degree preferred

Tools

Kafka

MQ

PostgreSQL

SQL Server

MySQL

MongoDB

React.js

TypeScript

NestJS

Spring Boot

Job description

State Street seeks a Full‑Stack Application Developer with a strong emphasis on the services layer and a React.js UI. The role supports a hybrid work model, balancing home and office work to fit needs and role requirements.

Responsibilities include building service-layer components, API contracts, data access, and UI features with React.js/TypeScript. You will work with Kafka/MQ, CI/CD, and modern DevOps practices in a collaborative, international environment.