--- title: Application Security Engineer - Payments at TTWD description: About TT Wonders [TTWD] TT Wonders [TTWD] builds white-label iGaming Software used by 100+ clients, with a strong focus on Asian Markets. For more than 10 Years, we have helped Businesses Launch and R --- # Application Security Engineer - Payments **Company:** TTWD **Location:** Georgia **Posted:** 2026-11-10 **Apply by:** 2026-12-25 **Tags:** security [Apply / View original posting](https://www.linkedin.com/jobs/view/4487487570) ## Job description About TT Wonders [TTWD] TT Wonders [TTWD] builds white-label iGaming Software used by 100+ clients, with a strong focus on Asian Markets. For more than 10 Years, we have helped Businesses Launch and Run Online Casino Platforms by providing the Technology, Game Content and Operational Support they need. What We Build 1. A Customizable White-Label Casino Platform. 2. An Aggregator API with 900+ Games from 100+ Game Providers. 3. A White-Label Payment Gateway connected to 30+ Payment Providers, Supporting Cards, E-Wallets, Cryptocurrency and Multiple Currencies. 4. An AI-Powered Back Office that Automates Payments and Transaction Approvals, and Detects Payment Fraud, Bonus Abuse and Account Takeovers. 5. An Affiliate System for Partner Management. Why Security Matters Here Our platform handles Deposits, Withdrawals and Payment Integrations for many Client Brands. Our Application Security Engineer helps keep these flows safe, from Gateway Integrations and Callbacks to Transaction Handling and Data Isolation Between Clients. * Website: https://ttwd.com Job Description Responsibilities Conduct Source Code Reviews, API Security Testing, and Business Logic Assessments for a Payment Platform. Review Tenant Isolation, Access Controls, Transaction Idempotency, Duplicate Payout Prevention, Request Signatures, Payment Callbacks, and Credential Security. Assess New Features and Payment Gateway Integrations; Drive Vulnerability Remediation, Retesting, and Automated Security Regression Tests. Work With Engineering, QA, and Operations to Improve Security Checks throughout Development and Release. Requirements Practical Experience in Application Security , Penetration Testing , or Secure Code Review , with the ability to Independently Identify Vulnerabilities and Recommend Fixes . Ability to Read Java/Spring Boot Code ; Familiarity with HTTP , REST API s, PostgreSQL , and Redis . Understanding of Authorization Flaws, Injection, SSRF, File Upload Vulnerabilities, Authentication, Cryptographic Signatures, and Replay Attacks. Ability to identify business logic risks involving concurrency, retries, and transaction state changes beyond automated scanning. Clear Communication Skills, Including Documenting Reproducible Findings, Explaining Business Impact, and Tracking Remediation to Completion. Languages English: Mandatory, Written and Spoken. Russian: Native or Fluent Russian Speakers are Prioritized. Nice to Have Experience Securing Payment Systems, Financial Applications, Multi-Tenant SaaS Platforms, or Payment Gateway Integrations. Experience with Security Test Automation, CI/CD Security Checks, or Secrets Management. --- 🔔 [Monitor similar jobs on Gurify](https://gurify.com/?utm_source=techgeo&utm_medium=jobboard&utm_campaign=monitor_similar&role=Application+Security+Engineer+-+Payments) — get alerted when matching roles are posted in Georgia. ```json {"@context":"https://schema.org/","@type":"JobPosting","title":"Application Security Engineer - Payments","description":"

About TT Wonders [TTWD] TT Wonders [TTWD] builds white-label iGaming Software used by 100+ clients, with a strong focus on Asian Markets. For more than 10 Years, we have helped Businesses Launch and Run Online Casino Platforms by providing the Technology, Game Content and Operational Support they need. What We Build 1. A Customizable White-Label Casino Platform. 2. An Aggregator API with 900+ Games from 100+ Game Providers. 3. A White-Label Payment Gateway connected to 30+ Payment Providers, Supporting Cards, E-Wallets, Cryptocurrency and Multiple Currencies. 4. An AI-Powered Back Office that Automates Payments and Transaction Approvals, and Detects Payment Fraud, Bonus Abuse and Account Takeovers. 5. An Affiliate System for Partner Management. Why Security Matters Here Our platform handles Deposits, Withdrawals and Payment Integrations for many Client Brands. Our Application Security Engineer helps keep these flows safe, from Gateway Integrations and Callbacks to Transaction Handling and Data Isolation Between Clients. * Website: https://ttwd.com Job Description Responsibilities Conduct Source Code Reviews, API Security Testing, and Business Logic Assessments for a Payment Platform. Review Tenant Isolation, Access Controls, Transaction Idempotency, Duplicate Payout Prevention, Request Signatures, Payment Callbacks, and Credential Security. Assess New Features and Payment Gateway Integrations; Drive Vulnerability Remediation, Retesting, and Automated Security Regression Tests. Work With Engineering, QA, and Operations to Improve Security Checks throughout Development and Release. Requirements Practical Experience in Application Security , Penetration Testing , or Secure Code Review , with the ability to Independently Identify Vulnerabilities and Recommend Fixes . Ability to Read Java/Spring Boot Code ; Familiarity with HTTP , REST API s, PostgreSQL , and Redis . Understanding of Authorization Flaws, Injection, SSRF, File Upload Vulnerabilities, Authentication, Cryptographic Signatures, and Replay Attacks. Ability to identify business logic risks involving concurrency, retries, and transaction state changes beyond automated scanning. Clear Communication Skills, Including Documenting Reproducible Findings, Explaining Business Impact, and Tracking Remediation to Completion. Languages English: Mandatory, Written and Spoken. Russian: Native or Fluent Russian Speakers are Prioritized. Nice to Have Experience Securing Payment Systems, Financial Applications, Multi-Tenant SaaS Platforms, or Payment Gateway Integrations. Experience with Security Test Automation, CI/CD Security Checks, or Secrets Management.

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