Software Engineer, Officer

State Street; Kraków; Hybrid; PLN 118,800 - 145,200; Full time

Benefits offered by this job

Permanent contract from day one

Birthday/anniversary time off

Private medical package

Job summary

State Street is seeking a Full-Stack Application Developer in Kraków to help build the services layer and a React.js UI. You will implement APIs, data access, and integrations while delivering scalable, reliable software in a hybrid work model.

You’ll work across backend and frontend with Node.js/Express/NestJS, Java Spring Boot, and modern frontend tech, collaborating with international teams to ship robust products.

Qualifications

• BS or higher in computer science, engineering, math or physics.
• Experience building service layers and REST APIs with secure scalable design.
• Proficiency with React.js and modern JavaScript/TypeScript.
• Experience with databases (PostgreSQL, SQL Server, MySQL, MongoDB) and data modelling.
• Familiar with CI/CD, code quality tools and DevOps practices.

Responsibilities

• Build and maintain service-layer components, orchestration, and integrations.
• Implement authentication/authorization, validation, error handling, and API contracts.
• Develop data access logic and optimize queries for performance.
• Create UI features with React.js and TypeScript, ensuring accessibility and responsiveness.

Skills

Node.js

TypeScript

React.js

REST APIs

SQL & Databases

Testing (Unit/Integration)

CI/CD / DevOps

Education

B.S. or higher in CS/Engineering/Math/Physics

MS degree preferred

Tools

Kafka

MQ

Job description

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.

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.

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.

What You Will Be Responsible For

Services Layer / Backend (Primary Focus)

• 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) 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:

• Experience building service layers and APIs (REST), including secure and scalable design.
• Node.js (Express/NestJS) and TypeScript
• Java (Spring Boot)
• 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, and Physics or other technical course of study required. MS degree strongly preferred.
• Min. 3-5 years of relatable experience.

Are you the right candidate? Yes!

We truly believe in the power that comes from the diverse backgrounds and experiences our employees bring with them. Although each vacancy details what we are looking for, we don’t necessarily need you to fulfil all of them when applying. If you like change and innovation, seek to see the bigger picture, make data driven decisions and are a good team player, you could be a great fit.

Why this role is important to us.

Our technology function, Global Technology Services (GTS), is vital to State Street and is the key enabler for our business to deliver data and insights to our clients. We’re driving the company’s digital transformation and expanding business capabilities using industry’s best practices and advanced technologies such as cloud, artificial intelligence and robotics process automation.

We offer a collaborative environment where technology skills and innovation are valued in a global organization. We’re looking for top technical talent to join our team and deliver creative technology solutions that help us become an end-to-end, next-generation financial services company.

Join us if you want to grow your technical skills, solve real problems and make your mark on our industry.

About State Street

State Street is one of the largest custodian banks, asset managers and asset intelligence companies in the world. From technology to product innovation, we’re making our mark on the financia

Minimum Salary

zł132,000 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.

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