Senior Software Engineer - KYC & Eligibility

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.

As a Senior Software Engineer in the KYC & Eligibility team, you will be responsible for building and optimizing the onboarding and identity verification processes at Blockchain.com. Your work will ensure that customers can seamlessly and securely access our platform while meeting regulatory and compliance requirements. You will collaborate with engineering, compliance, and product teams, integrating third-party identity verification providers such as Sumsub, Veriff, and DXC, to create a scalable, reliable, and efficient onboarding experience.

This role requires strong technical expertise, a problem-solving mindset, and the ability to build systems that are both secure and user-friendly. You will take the lead to design, develop and maintain our onboarding flows, ensuring high availability, low latency, and optimal user experience.

WHAT YOU WILL DO

Technical Execution & Engineering Excellence

• Design, develop, and maintain the KYC & Eligibility platform, ensuring scalability, security, and reliability.
• Integrate with third-party identity verification providers (Sumsub, Veriff, DXC) and optimize interactions to reduce verification failures and improve user conversion rates.
• Write high-quality, maintainable, and efficient code while upholding best practices in software development.
• Set guidelines for observability and the monitoring of KYC services, leveraging tools to improve system performance and debugging capabilities.
• Work closely with compliance and risk teams to ensure regulatory requirements are met while maintaining a seamless user experience.
• Improve fraud detection and prevention mechanisms, ensuring that our onboarding flow remains secure and efficient.
• Collaborate with backend and frontend engineers to enhance the end-to-end onboarding experience.
• Contribute to technical architecture discussions, ensuring that design choices align with both business goals and system performance.

Collaboration & Cross-Functional Impact

• Work closely with engineering, product, and compliance teams to enhance the eligibility and onboarding experience.
• Participate in code reviews, offering constructive feedback to maintain code quality and consistency.
• Partner with infrastructure teams to improve deployment processes, ensuring high availability and resilience.
• Provide technical guidance to junior engineers and collaborate with other teams on shared initiatives.

Continuous Improvement & Innovation

• Optimize KYC workflows to balance security, compliance, and user experience.
• Identify and resolve performance bottlenecks, ensuring smooth onboarding and verification processes.
• Continuously evaluate and improve eligibility-related automation, reducing manual review overhead and enhancing efficiency.
• Stay up-to-date with emerging technologies and contribute to process improvements that enhance engineering effectiveness.

WHAT YOU WILL NEED

Technical Skills

• Proficiency in JVM languages (Kotlin, Java), Kafka and PostgresSQL
• Experience working with identity verification providers such as Sumsub, Veriff, and DXC.
• Strong understanding of event driven distributed systems, APIs, and microservices architectures.
• Knowledge of observability and monitoring tools to maintain system reliability and performance.
• Familiarity with security best practices, particularly in KYC, fraud detection, and compliance systems.
• Experience working in high-throughput, low-latency environments where scalability and efficiency are key.
• Experience with SQL (Postgres) and NoSQL databases (Redis), ensuring optimal data storage and retrieval for KYC processes.

Collaboration & Communication

• Ability to work cross-functionally with Compliance, Risk, Product, and Engineering teams to enhance onboarding flows.
• Strong problem-solving and debugging skills, ensuring quick incident resolution and system improvements.
• Excellent written and verbal communication skills, ensuring technical discussions are clear and productive.

Preferred Qualifications

• Experience working in fintech, crypto, or other highly regulated industries.
• Prior work on fraud detection, eligibility, or transaction risk systems.
• Exposure to machine learning models or automation techniques for KYC optimization.

COMPENSATION & PERKS

• Competitive full-time salary based on experience and meaningful equity in an industry-leading company
• Awesome office location in the heart of Paris
• Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year.
• The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an exciting, emerging industry
• Unlimited vacation policy; work hard and take time when you need it
• Performance-based bonuses paid in cash
• Apple equipment provided by the company

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.

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