Blockchain.com is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, Blockchain.com has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions. Join our Orders team as a Software Engineering Intern and gain real-world experience helping to power the buy, sell, and swap of cryptocurrencies on Blockchain.com. You’ll work alongside seasoned engineers to build the services and APIs that make trading fast, reliable, and secure for millions of users worldwide. This internship will give you hands-on exposure to Kotlin-based microservices, modern system design patterns like event sourcing, and scalable backend infrastructure, all while contributing to live production systems in the fast-paced world of crypto. Duration: 6-month internship with potential for permanent employment WHAT YOU WILL DO Support the development of APIs that enable crypto trading across Blockchain’s products. Learn to build and maintain distributed backend systems using Kotlin and PostgreSQL. Help improve the scalability and performance of our order execution systems. Participate in code reviews, testing, debugging, and observability efforts. Collaborate with engineers and product managers to ship high-impact features. Gain exposure to reactive architectures, event-driven systems, and message queues (Kafka). WHAT YOU WILL NEED Basic proficiency in a JVM-based language (Java or Kotlin preferred). Understanding of REST APIs and common backend concepts. Some familiarity with relational databases such as PostgreSQL. Enthusiasm for building systems that scale and curiosity about the crypto industry. Collaborative mindset, with good communication skills and eagerness to learn. BONUS SKILLS Exposure to Kafka, CQRS, or event sourcing concepts. Awareness of trading systems, order matching, or exchange architecture. Passion for crypto, fintech, or decentralized systems. WHY JOIN US Work on backend systems that power real-time crypto trading for millions. Learn how to build resilient, fault-tolerant services in a production setting. Be mentored by experienced engineers and contribute to high-impact projects. Grow your understanding of crypto markets, APIs, and backend design patterns. Potential for a full-time role based on performance. This role is ideal for someone eager to grow their backend engineering skills in a high-performance environment, while also gaining valuable domain knowledge in crypto trading and financial systems. COMPENSATION & PERKS Competitive full-time salary for your level of experience Based in our London office with four days per week in-person collaboration Daily free lunch at the office Commuter support: we reimburse up to 50% of your travel costs ClassPass to keep you moving and well Apple equipment to do your best work The chance to make a real impact and grow your career at a fast-scaling global crypto company Flexible, modern, and people-first work culture Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time. You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment. Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses. Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment. Under the GDPR, you have the right to request access to your personal data, to request that your personal data be rectified or erased, and to request that processing of your personal data be restricted. You also have the right to data portability. In addition, you may lodge a complaint with an EU supervisory authority.