Senior Full-Stack Developer (React+Java) Job at ELEKS

Senior Full-Stack Java Developer

Location

Poland , Warszawa

Salary:

Not provided

Algoteque

Expiration Date

Until further notice

Requirements

Proven experience as a Full-stack Developer with a strong portfolio
Strong skills in Java 17+ (Spring, Hibernate) for backend development
Good knowledge of how to use software design patterns in practice
Hands-on experience with Spring Framework and Spring Security, including dependency injection, security, and web services
Ability to design and build RESTful APIs
Knowledge of ORM concepts and Hibernate, with experience in performance optimization
Familiarity with SLF4J, Log4J, and good practices for application monitoring
Solid knowledge of React and frontend technologies (HTML, CSS, TypeScript)
Strong SQL and PostgreSQL skills, with experience in database optimization (indexing, performance analysis, normalization/denormalization)
Solid experience with unit testing using JUnit and Mockito, familiar with PowerMock

Job Responsibility

Develop and maintain both backend and frontend parts of the application
Design and implement scalable, secure, and high-performing solutions
Collaborate with the team to deliver high-quality software

What we offer

B2B contract
100% remote work
A unique and engaging project in the EdTech space

Fulltime

Senior Java React Full Stack Developer

The JAVA Full Stack Senior Developer role is an intermediate level position resp...

Location

Canada , Mississauga

Salary:

94300.00 - 141500.00 USD / Year

Citi

Expiration Date

Until further notice

Requirements

Excellent communication and collaboration skills, with the ability to articulate complex technical concepts to diverse audiences.
6+ years of professional experience in full-stack software development, with a proven track record of delivering complex, large-scale, enterprise-level applications
6+ years of hands-on experience designing micro-service-based application
Strong hands-on experience with modern JavaScript frameworks, specifically React.js and TypeScript, for building sophisticated user interfaces
Deep proficiency in Java and the Spring Boot framework for building enterprise-grade microservices
Low-latency, scalable, high-throughput API development (Spring Boot, Hibernate/JPA)
Hands-on experience with a major cloud platform (AWS, Azure, or GCP) and containerization technologies (Docker, Kubernetes, OpenShift). Familiarity with CI/CD pipelines (Jenkins, GitHub Actions) is essential.
Problem-solving, troubleshooting, and clean code (Core Java, J2EE, Collections, Multithreading)
API integration (third-party libraries, security)
Distributed, multi-tier application, Reusable components/services development experience

Job Responsibility

Utilize mature programming methodologies and languages, including Java Spring Boot and React.js, to deliver and maintain high-quality software solutions.
Design, develop, test, and deploy end-to-end solutions, from responsive React.js front-end components to resilient Java Spring Boot microservices.
Architect and implement RESTful APIs and expose backend functionality as MCP (Model Context Protocol) services to be consumed by AI agents.
Deploy and manage applications within Citi's cloud environment (leveraging OpenShift/Kubernetes and AWS), integrating with cloud-native storage like S3 and enterprise databases like Oracle as a Service (OraaS).
Partner with and contribute to a cross-functional team of product managers, designers, and other engineers to translate business requirements into high-quality technical solutions.
Evaluate and recommend new and emerging technologies, including the application of AI, to solve complex business problems.
Ensure software components are designed and implemented to be of high quality, reusable, and easily maintainable.
Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations.
Conduct tasks related to feasibility studies, time and cost estimates, IT planning, risk technology, applications development, model development, and establish and implement new or revised applications systems and programs to meet specific business needs or user areas
Monitor and control all phases of development process and analysis, design, construction, testing, and implementation as well as provide user and operational support on applications to business users

Fulltime

Senior Full-Stack Developer, Java Focus

We're seeking a talented and passionate Senior Full-Stack Developer to join our ...

Location

United States , Greater Cincinnati/Dayton, OH

Salary:

Not provided

Ingage Partners

Expiration Date

Until further notice

Requirements

5+ years of experience in full-stack software development
Proven experience in modern Java development, with proficiency in frameworks such as Spring, Struts, Hibernate, and more
Experience with cloud platforms, preferably AWS or Azure (or similar)
Solid understanding of front-end development using modern frameworks like React, Vue.js, or Angular, along with JavaScript, HTML, and CSS
Experience with databases (SQL or NoSQL), CI/CD pipelines, and testing frameworks
Strong working knowledge of Agile development methodologies
Experience with DevOps tools and processes such as Git, Jenkins, or Docker
Demonstrated ability to work independently and collaboratively within a team environment
Excellent communication, problem-solving, and interpersonal skills
A passion for creating innovative solutions and making a positive impact

Job Responsibility

Design, develop, and implement full-stack applications utilizing Java, and modern front-end frameworks
Collaborate with clients and internal teams to gather requirements and translate them into technical specifications
Write clean, efficient, and well-documented code
Participate in code reviews to ensure code quality and adherence to best practices
Contribute to all phases of the software development lifecycle, from planning to deployment and maintenance
Troubleshoot and debug software issues, ensuring high levels of performance and reliability
Work within an Agile environment, participating in sprints and contributing to team goals
Engage with clients to understand their business needs and provide technical guidance
Actively participate in our company's community impact and open-source initiatives
Embrace growth opportunities and contribute to our culture of continuous learning

Fulltime

Senior Full-Stack Engineer - Java & React

As a Senior Full‑Stack Engineer, you will design, build, and deliver cutting‑edg...

Location

Poland , Gdansk

Salary:

Not provided

Mastercard

Expiration Date

Until further notice

Requirements

5+ years of software engineering experience across backend and frontend development
Strong hands‑on experience with Java, plus proficiency in React
Experience with .NET is welcome but not required
Solid experience building RESTful APIs, microservices, and working in cloud environments (AWS, GCP, or Azure)
Strong understanding of UI/UX principles, responsive design, and accessibility standards
Demonstrated experience collaborating with designers and product teams to deliver user‑centric products
Knowledge of modern engineering practices: CI/CD, automated testing, code reviews, Agile/Scrum
Excellent communication and stakeholder‑management skills, with the ability to translate between technical and business needs
Proactive, detail‑oriented, accountable, and comfortable working independently in a fast‑paced environment

Job Responsibility

Plan, design, and develop full‑stack solutions that align with Mastercard’s engineering standards, processes, and best practices
Build and maintain scalable backend services and APIs within Mastercard’s Open Finance ecosystem using Java
Collaborate with UI/UX designers to implement responsive, accessible user interfaces using React
Ensure that front‑end applications meet WCAG accessibility guidelines, deliver exceptional performance, and are optimised for multiple devices
Ensure high code quality through unit/integration testing, peer reviews, and CI/CD pipelines
Contribute across the full software development life cycle—from requirements gathering to release and ongoing support
Troubleshoot, debug, and resolve production issues, ensuring service resilience and performance
Mentor and support junior engineers, fostering knowledge sharing and continuous improvement
Partner with product owners and stakeholders to prioritise features, communicate progress, and manage technical trade‑offs
Stay current with emerging technologies, frameworks, and best practices across frontend and backend engineering

Fulltime