TikTok Security Software Engineer Intern, London, 2025

About the TeamFIDO stands for Fast Identity Online. It is the state-of-the-art authentication that is arguably the most secure of all currently available authentication methods. Our team's mission is to protect both internal and external users across all company applications with secure and user-friendly FIDO2 authentication. We have a variety of tech stacks, including WebAuthN server, mobile and web SDK, tools, and other components that implement FIDO2 and support its use.
There are two major initiatives in our team, mainly separated by the different types of customers we serve:

• Internal ToE(nterprise): Empower every employee as a phishing-resistant user.
  
• External ToC(onsumer) and ToB(usiness): Deliver a seamless and secure FIDO2 authentication experience across all company products. Job Responsibilities - Support as a technical expert for requirements, design and implementation of FIDO2 services and products across TikTok's suite of products.
  
• Assist with the design, develop and onboard FIDO2 service with all the company services, including but not limited to compute, storage, DB systems.
  
• Partner with Product, Operation team, Security/Legal/Compliance and other engineering teams to identify and address authentication related security issues.
  
• Play a critical role in influencing cross functional partners and roadmaps to continuously tighten the security posture of overall TikTok's Infrastructure.
  
• Technology: - Cloud-based microservice architecture in Golang - Highly distributed system with data centers in multiple countries - Data pipelines and query engines - More specifically include - Golang, Python and other common object-oriented programming language - MySQL, Redis, Elastic Search, Kafka - Grafana, Hive - Thrift RPC, Service Mesh, Consul, TLS, mTLS - React, Vue, Angular, NodeJS or other common web framework - Native Android and iOS client
  
  Minimum Qualifications:
  
• Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or other relevant majors. - Available to start immediately for 9-12 week duration.
  
• Proficiency in English to enable ongoing collaboration and communication within the team.
  
• Experience with OAuth, FIDO2, and Passkey, and the application of security technologies such as Android TEE and Strongbox, Apple SEP, and TPM. Preferred Qualifications:
  
• Experience with iOS development (Swift and/or Objective-C) is a plus.
  
• Experienced in the design and implementation of large scale distributed system - Creative problem-solving skills and excellent troubleshooting and debugging skills
  
• Strong written & verbal communication and excellent teamwork skills