API Security Engineer
API Security Engineers protect the interfaces that expose business logic and data to the outside world. They conduct threat modelling sessions, review authentication flows, write security requirements, and communicate findings to developers who may not have a security background. This path builds the precise English vocabulary for every API security design, review, and remediation conversation.
Topics covered
- OAuth 2.0 & JWT
- OWASP API Top 10
- Threat Modelling
- Rate Limiting & Quotas
- Security Requirements Writing
- Penetration Testing Language
Vocabulary spotlight
4 terms every API Security Engineer should know in English:
An authorisation framework that enables applications to obtain limited access to user accounts on third-party services without exposing credentials
"We implemented the OAuth 2.0 authorisation code flow with PKCE to secure the mobile app's access to the resource server."
A structured process for identifying potential threats, attack vectors, and mitigations for a system before it is built or changed
"The threat modelling session revealed that the file upload endpoint was vulnerable to path traversal — we added server-side validation immediately."
The Open Web Application Security Project's list of the ten most critical API security risks, used as a baseline for API security reviews
"The penetration test found two OWASP API Top 10 issues: Broken Object Level Authorisation and Excessive Data Exposure."
A control that restricts the number of API requests a client can make in a given time window, preventing abuse and denial-of-service attacks
"We applied per-client rate limiting at the API gateway: 100 requests per minute for free tier, 1,000 for paid tier."
📚 Vocabulary Reference
Key terms organised by category for API Security Engineers:
Auth & Identity
OWASP API Risks
Threat Modelling
Controls
Recommended exercises
Real-world scenarios you'll practise
- Running a threat modelling session for a new payments API, facilitating discussion of STRIDE threats and mitigation priorities.
- Writing a security finding report for a Broken Object Level Authorisation vulnerability, including reproduction steps and remediation guidance.
- Reviewing an OAuth 2.0 implementation in a PR and writing precise comments about token scopes, expiry, and refresh token rotation.
- Presenting API security audit results to development leadership, translating technical findings into business risk language.
Recommended reading
Frequently Asked Questions
What English skills do API Security Engineers most need to improve?+
API Security Engineers most commonly need to improve: technical vocabulary (the correct English terms for domain concepts), collocation accuracy (using the right verb for each action), written communication (bug reports, PR descriptions, technical docs), and spoken communication for standups, code reviews, and stakeholder meetings.
How long does the API Security Engineer learning path take?+
The API Security Engineer learning path contains 20–40 hours of material studied comprehensively. Most learners focus on the highest-priority modules first and return to the rest over time. Spending 30 minutes per day for 4–6 weeks produces noticeable improvement in workplace English.
What vocabulary should a API Security Engineer prioritise first?+
Start with the vocabulary that appears most in your daily work — terms you read in documentation, use in commit messages, and hear in meetings. The API Security Engineer path begins with the most frequent vocabulary clusters before moving to advanced communication patterns.
Are there interview exercises for API Security Engineer roles?+
Yes. The API Security Engineer path includes role-specific interview question modules with model answers and key phrases — the actual questions interviewers ask and the vocabulary needed to answer them fluently. There is also a dedicated Interview Practice hub for general interview skills.
Does this path include pronunciation help?+
Yes. The path links to pronunciation exercises for the technical terms most commonly mispronounced in this domain. The Pronunciation hub includes drills for acronyms, silent letters, word stress, and minimal pairs — all in IT context.
What are the most common English mistakes API Security Engineers make?+
The most common mistakes: incorrect collocations (using the wrong verb with a technical noun), false friends from L1, tense errors when narrating past incidents or walkthroughs, and using overly formal or overly casual register in written communication.
How do I improve my English for code reviews?+
Learn the standard code review collocations: approve a PR, request changes, leave a nit, address feedback, block a merge, resolve a conversation. Use hedging language for suggestions: "This might be cleaner as…", "Have you considered…?". The Collocations section includes a dedicated Code Review set.
Can I use this path alongside my daily work?+
Yes — the path is designed for working professionals. Each exercise set takes 10–15 minutes. The most effective approach is to study a vocabulary module before a meeting or task where you'll use that vocabulary, then practise immediately after. Context-linked practice produces much faster retention.
Is the content free?+
Yes, completely free. No registration required, no payment, no time limit. All vocabulary modules, exercises, glossary entries, and learning path guides are open access.
How do I track my progress through this path?+
Progress is tracked in your browser's local storage — completed exercise sets are marked with a checkmark when you return. No account is needed. You can bookmark specific modules and use the exercises overview to see which sets you've completed.