Senior/Lead Full Stack Developer (Java/React) – Tieto Tech Consulting (m/f/d)

About this role

Tieto Tech Consulting (MentorMate from 2001 to 2026) is looking for a highly skilled and motivatedSenior Java Full Stack Developer, a professional who will join a project within a Telecom Team for our respectful client BICS.

Join the team of our customer BICS – a global telecommunication enabler with a physical network stretching through the globe! Grow your expertise through interacting with A-level mobile carriers from all over the world. Get your hands on the vast network with on land, underwater, and space points of presence. Join our decade-long partnership with BICS to ensure confidence in your future and long-term growth! Tieto-BICS team has been growing since 2010… and we are looking forward to grow with you!

• Develop your telecom expertise in diverse portfolio of BICS products, including Voice, Cloud, Signaling, LTE, IoT, etc.
• Enjoy unmatched growth opportunities with BICS vast network and customers around the world.

Tieto - BICS team has been growing since 2010… and we are looking forward to growing with you!

Responsibilities

• Design, develop, and maintain scalable applications using Java and modern frontend technologies
• Lead by example and mentor a development team in day-to-day delivery while continuously improving engineering practices
• Drive technical discussions and contribute to architecture decisions
• Collaborate closely with stakeholders, product owners, and cross-functional teams
• Ensure clean, maintainable, and well-tested code
• Take ownership of features and deliver end-to-end solutions independently

Requirements

• 5+ years of experience in commercial software development using Java
• Strong experience with Java 17+, Spring, Spring Boot, Hibernate, and JPA
• Good knowledge of JavaScript and React.js
• Experience in API design and development
• Strong understanding of relational and NoSQL databases, with expertise in writing and optimizing complex SQL queries
• Solid understanding of design patterns, clean code princi...