Java Jobs in Web3

Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time. We’re seeking a highly motivated Software Engineering Intern to join the Payments team at Blockchain.com. This team enables users across the world to deposit and withdraw funds from the Blockchain.com platform — building the infrastructure that bridges traditional finance and crypto. As an intern, you’ll gain hands-on experience working with backend systems in Kotlin, while learning how to integrate with banks, payment providers, and financial infrastructure. This is a great opportunity for someone curious about building secure and scalable systems in the fast-evolving world of crypto and fintech. Duration: 6-month internship with potential for permanent employment WHAT YOU WILL DO

Contribute to the development of APIs that power deposits, withdrawals, and payment flows in the Blockchain.com app. Assist in integrating with external payment providers and banks, supporting users in multiple regions. Write clean, maintainable, and testable code under the guidance of experienced engineers. Help resolve technical issues related to payments in collaboration with the FinOps and engineering teams. Learn and apply best practices in monitoring, performance tuning, and security for payment systems. Participate in code reviews, discussions, and team stand-ups, contributing ideas and learning collaboratively.

WHAT YOU WILL NEED

Some experience with backend programming – Kotlin, Java, or another statically typed language. Basic understanding of HTTP APIs and how backend systems communicate. Familiarity with relational databases like PostgreSQL. A genuine interest in payments technology, fintech, or crypto infrastructure. Enthusiastic, curious, and eager to learn in a production environment. Good written and verbal communication skills for cross-functional collaboration.

NICE TO HAVE

Exposure to Kafka, Redis, or monitoring tools (e.g., Grafana, Datadog). Interest in cryptocurrency, open finance, or financial APIs. Experience with writing or consuming APIs in personal projects or coursework.

WHY JOIN US

Work on real-world payments infrastructure used by millions globally. Collaborate with a high-performing team solving complex engineering challenges. Gain mentorship and exposure to modern backend tools and practices. Learn how crypto, banking, and software converge to power next-generation finance. Potential for a full-time offer based on performance and team needs.

This internship is ideal for aspiring backend engineers with a passion for fintech or crypto, who are eager to learn how global payment systems are designed, integrated, and scaled. COMPENSATION & PERKS

Apple equipment The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field Flexible work culture  

LI-Hybrid

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 [email protected]. 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.