Full Stack Development Lead (Java + React.js)📍 Hybrid in Warsaw (3 days/week onsite required) | 💼 Full-time | Employment contract up to $9,500/monthOur client is a US-based technology company headquartered in New York City, delivering digital solutions and consulting services that transform businesses and drive measurable value. With offices across multiple countries, the company is now investing in a new engineering centre in Warsaw, recognizing the strong technical culture and exceptional talent of Polish software professionals.Their integrated ecosystem combines: PaaS (Platform as a Service): an AI-native enterprise operations foundation built to optimize workflows and accelerate value creation. SaaS (Software as a Service): a cloud platform delivering unmatched performance, intelligence, and execution at scale. S&C (Solutions & Consulting Suite): modular technology playbooks designed to manage, grow, and optimize company performance. With over a decade of experience supporting high-growth and private equity-backed platforms, the company brings deep domain expertise and a proven ability to turn technology into a strategic advantage.Role OverviewWe are looking for a Full Stack Development Lead with expertise in Java and React.js to drive the design, development, and delivery of scalable web applications. This role requires strong leadership, hands-on technical expertise, and the ability to guide development teams in an Agile environment.As a Lead Developer, you will collaborate with cross-functional teams to ensure best practices, code quality, and successful project execution.Key ResponsibilitiesTechnical Leadership & Strategy Define and implement architectural best practices for scalable, high-performance applications. Lead a team of full-stack developers, providing mentorship, code reviews, and technical guidance.

Collaborate with product owners, designers, and DevOps teams to align technical solutions with business goals.

Full Stack Development Design and develop responsive, user-friendly front-end applications using React.js, Redux, TypeScript, and modern JavaScript (ES6+). Build and maintain RESTful APIs and microservices using Java, Spring Boot, Hibernate, and JPA. Ensure seamless integration between front-end and back-end, optimizing performance and security. System Architecture & Performance Optimization Design microservices-based architectures ensuring modularity and scalability. Optimize database interactions and caching strategies using SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). Implement best practices for performance tuning, security, and scalability. CI/CD & Deployment Manage application deployments using Docker, Kubernetes, and CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Work with AWS, Azure, or GCP to optimize infrastructure and deployment. Agile Development & Team Collaboration Participate in Agile/Scrum processes, sprint planning, and retrospectives. Collaborate closely with stakeholders to translate business requirements into technical solutions.

Drive process improvements and uphold best coding practices across the team.

Required Skills & ExperienceFront-End: Strong expertise in React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript (ES6+). Hands-on experience with Material-UI, Bootstrap, or Tailwind CSS. Back-End: Proficiency in Java, Spring Boot, Hibernate, JPA, and RESTful API development. Experience designing and implementing microservices architecture. Knowledge of authentication and security standards (OAuth2, JWT, etc.) DevOps & Cloud: Experience with Docker, Kubernetes, and cloud platforms (AWS, Azure, GCP). Familiarity with CI/CD tools for automated builds and deployments. Leadership & Agile Practices: Proven experience leading and mentoring development teams. Strong understanding of Agile methodologies (Scrum/Kanban) and DevOps culture.

Experience conducting code reviews and ensuring best engineering practices.

Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 7+ years of hands-on experience in full-stack development (Java + React.js). Strong problem-solving and analytical skills. Excellent communication and leadership abilities. Ability to manage multiple priorities in a fast-paced environment.

Passion for continuous learning and staying current with emerging technologies.

What’s Offered Employment contract (UoP) with monthly compensation up to $9,500 Opportunity to grow in a global fintech environment High-impact projects with cutting-edge technology Collaborative, open, and ambitious team culture Hybrid model – 3 days/week onsite in Warsaw city cent