Software Engineering Intern, Payments

AXS Blockchain; Greater London; On-site; GBP 18,000 - 21,000; Full time

Benefits offered by this job

Competitive salary

Daily free lunch

Commuter support

ClassPass

Apple equipment

Flexible work culture

Job summary

A leading global crypto company is seeking a Software Engineering Intern to join its Payments team in London. This internship offers hands-on experience with backend systems, specifically in Kotlin, enabling users to make secure deposits and withdrawals. Successful candidates will assist in API development, learn about payment integrations, and collaborate with experienced engineers in a dynamic, diverse environment. Join us to help bridge traditional finance with the future of crypto.

Qualifications

• 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.
• Genuine interest in payments technology, fintech, or crypto infrastructure.

Responsibilities

• Contribute to the development of APIs that power deposits, withdrawals, and payment flows.
• Assist in integrating with external payment providers and banks.
• Write clean, maintainable, and testable code.
• Help resolve technical issues related to payments.
• Learn monitoring, performance tuning, and security practices for payment systems.
• Participate in code reviews and team stand-ups.

Skills

Backend programming

Kotlin

Java

Understanding of HTTP APIs

Relational databases

Communication skills

Education

Experience with backend programming

Tools

PostgreSQL

Kafka

Redis

Grafana

Datadog

Job description

Blockchain 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 has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.

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.

Bonus Skills

• 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

• 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 [e-mail]. 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.

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