Backend QA Engineer (Payments Integration) Belgrade Engineering – QA / Full-Time / On-site Apply for this job About Unlimit   Founded in 2009, Unlimit is a global fintech company that offers a large portfolio of financial services, including payment processing, banking as a service (BaaS), and an on&off-ramp fiat solution for crypto, DeFi, and GameFi. The company’s mission is to deliver solutions that eliminate financial borders, enabling businesses to operate both locally and internationally with ease across Europe, the UK, LATAM, APAC, India, and Africa. Unlimit has 700 employees across 16 offices and five continents, including London, Singapore, São Paulo, Hong Kong, and Mexico. For further information, please visit: www.unlimit.com. About the job: Monitors every phase of the development process to ensure that the design and software adhere to company standards. A software quality assurance engineer helps meet deadlines by breaking up the development process into attainable testing goals and relaying any issues back to the development and team leaders.   We’re looking for QA Engineer to participate in the development of APM Team. Responsibilities: Review and analyze business and functional requirements, proactively identifying gaps or inconsistencies. Collaborate closely with developers, product owners, and analysts to establish and maintain high-quality standards. Develop detailed test cases and execute manual and automated tests. Perform thorough functional, integration, regression, and performance testing for payment adapters and PSP applications. Identify, isolate, document, and track bugs throughout the development and testing lifecycle. Document test progress, outcomes, and provide timely reports on test coverage and quality metrics. Participate actively in continuous improvement processes within the QA team. Requirements: 4+ years of professional experience in backend software testing. 2+ years of hands-on experience writing and maintaining automated tests using Java. Solid understanding of client-server architecture and RESTful APIs. Proficiency with different testing methodologies and test design techniques (functional, integration, regression, performance testing). Deep knowledge of software development life cycle (SDLC) and QA methodologies. Strong analytical skills with the ability to thoroughly review requirements, foresee potential impacts, and suggest solutions. Proven ability to multitask effectively across multiple concurrent payment integration projects. Practical experience with industry-standard tools such as Postman, IntelliJ IDEA, DataGrip, Jenkins, GitLab, Splunk, RabbitMQ, Argo CD. Clear, concise, and professional verbal and written communication skills. Fluent English (B1+). Nice to Have: Previous experience in fintech, particularly with payment gateway integrations or alternative payment methods. Understanding of payment processing concepts, transaction lifecycles, and related regulatory compliance aspects. Experience working with microservices architectures. Your Mindset: Proactive, solution-oriented mindset with high attention to details. Strong communication and interpersonal skills with the ability to work collaboratively as part of an agile team. Broad technical outlook and desire to learn, grow, and apply cutting-edge technologies and best practices. We offer: Attractive monthly salary paid in line with experience  Vacation, sick, and paid holidays Full-time: 5/2 Modern workplace with all necessary equipment A team of top international professionals to learn from Multicultural working environment Join Unlimit Team now! Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief. Apply for this job When applying, mention the word CANDYSHOP to show you read the job post completely.