Backend Engineer

Who Are We?We are Welltech — a global company with Ukrainian roots and a powerful mission: to move everybody to start and stay well for life. Today 25.5 million users have trusted Welltech to help them build healthy habits — a testament to the real value our innovative, engaging wellness solutions deliver every day. With five hubs across Cyprus, Ukraine, Poland, Spain and the UK and a diverse, remote-friendly team of 700+ professionals, we continue to scale rapidly. Our innovative apps — Muscle Booster, Yoga-Go and WalkFit — empower millions to transform their lifestyles and unlock their personal wellness journeys.Welltech is where your impact becomes real. And our values clearly attest to that: we grow together, we drive results, we lead by example and we are well-makers.If this looks like you and you thrive in a fast-paced environment, you'll fit right in at Welltech. Let's build wellness for millions together.What We're Looking ForWe're looking for a Back-end Engineer (Java) who's eager to grow, take on meaningful technical challenges, and contribute to building the next generation of payments infrastructure. If you enjoy writing clean, reliable code and want to work in a team where your contributions make a visible impact—this role is for you.You'll be part of our Payments team, a key driver behind a cutting-edge internal platform that powers payment flows across the entire organization. We're reimagining how payment processes should work—focusing on automation, scalability, and reliability.As part of a highly collaborative team, you'll work alongside experienced engineers and domain experts in infrastructure, distributed systems, and cloud-native development. You'll have a strong voice in technical discussions, take ownership of feature development, and grow your skills in an environment that values mentorship, learning, and experimentation. This is a great opportunity to deepen your back-end engineering expertise while contributing to a product that touches nearly every part of the company.Key responsibilities:Collaborate across disciplines: Work closely with cross-functional teams including Frontend/Backend Engineers, Infrastructure, QA (SDET), and Product Managers, to design, develop, and deliver innovative solutions that drive real impact.Design and implement robust systems: Translate both functional and non-functional requirements into scalable, reliable, and maintainable software. Your code will directly shape user experiences and system integrity.Build and operate microservices: Develop, deploy, and maintain high-performance microservices using Spring Boot. Own your services end-to-end—from design and implementation to deployment and ongoing support.Operate in cloud-native environments: Manage deployments and configurations across various Kubernetes clusters, ensuring smooth rollouts and minimal downtime in production and staging environments.Champion system excellence: Take responsibility for the performance, scalability, security, and data consistency of the systems your team owns. Proactively identify bottlenecks and propose architectural improvements.Drive engineering best practices: Promote clean code, test automation, continuous integration, and DevOps principles. Help elevate the engineering culture through thoughtful code reviews, tech talks, and collaboration.Required skills: Proven Java expertise: At least 3 years of hands-on experience building robust, high-performance applications using Java in production environments.Microservices architecture knowledge: A strong grasp of microservices principles, with a track record of designing and scaling distributed systems effectively.Spring Boot mastery: Deep, practical experience with the Spring Boot ecosystem—particularly with Spring MVC, RESTful services, Spring Data, Security, and messaging integrations.Database skills: Solid experience working with relational databases like PostgreSQL, including an understanding of relational database design, query optimization, and overall data architecture.Cloud infrastructure and Cloud-native deployment experience: Previous experience with AWS or another major cloud provider; practical experience deploying and managing services in Kubernetes across multiple environments (e.g., dev, staging, production).API and communication protocol fluency: Comfort working with REST, gRPC, messaging systems, and asynchronous communication patterns.CI/CD and DevOps mindset: A solid understanding of modern CI/CD pipelines, quality gates, and automation practices that support fast, safe releases.Quality-first approach: Demonstrated experience writing comprehensive unit, integration, and API tests for microservices-based systems.High proficiency in both written and spoken English, enabling seamless collaboration in an international team.Nice to have:Stream processing knowledge: Proficiency with Kafka and Kafka Streams for real-time data processing and event-driven architecture.Modern app design principles: Familiarity with The Twelve-Factor App methodology and its application in cloud-native service design.Candidate journey: Recruiter call ----> Technical Interview --->  Skills assessment-----> Meet the hiring manager Why You'll Love Being Part of Welltech:Grow Together: Join a culture that champions both personal and professional growth. Here, you'll thrive as we learn, evolve, and succeed together.Lead by Example: No matter your role, your leadership matters. Every team member is empowered to inspire and make an impact.Results-Driven: We're all about achieving meaningful outcomes. It's not just about the effort, but the difference we make every day.We Are Well-Makers: Be part of a movement that's creating a healthier, happier world. Together, we make well-being a realityCheck out some of our productsMuscle Booster — https://musclebooster.fitness/ Yoga-Go — https://yoga- WalkFit -