Principal C++ Engineer - Payment Systems

This is a Full Time Job

Location: Remote North Carolina, remote Miami, Remote Florida

Division: Ticketmaster, Payments

Line manager: VP Marketplace Engineering

Contract terms: Permanent, full time

THE TEAM

We're seeking an experienced C++ engineer to join our Platform Payments team, working on Ticketmaster's mission-critical payment processing systems. These systems process millions of transactions monthly across multiple payment methods and 20+ gateway providers, powering real-time payments for culture-defining live events at massive global scale.

THE JOB

You'll work across a mature C/C++ codebase spanning three decades - from pre-standard patterns in our core authorization gateway to C++17 in our Bazel monorepo. The immediate work is maintenance and strategic modernization of these systems, but this role is explicitly designed to grow: from legacy renovation into systems design, gRPC service architecture, and new technology adoption including Rust. If you're energized by the challenge of understanding why a system was built the way it was before deciding what it should become, this is the role.

This is not a maintenance job with a maintenance ceiling. You'll work on systems that power how fans pay for live events worldwide - at a scale where a misconfiguration can cause thousands of payment failures during a major onsale. The intellectual challenge is real: strategic modernization of systems spanning three decades of C++, with a clear trajectory into new technology.

There is tremendous green-field work ahead: decomposing legacy IPC into gRPC services, strengthening real-time fraud defenses during peak onsales, optimizing seamless global checkout, integrating new payment methods, and expanding embedded finance that shapes not just ticket purchases but the full in-venue experience. A strong engineer in this role will meaningfully shape the direction of these critical systems.

WHAT YOU WILL BE DOING
• Maintain and strategically modernize high-throughput payment processing systems handling real financial transactions in real time
• Drive platform migration work, including migrating a core Windows C++ authorization gateway to Linux via Clang and Bazel
• Develop robust payment integrations with third-party gateways (Chase Paymentech, Barclays, HSBC, AMEX, Adyen, Braintree, Klarna, Shift4, and others)
• Decompose legacy IPC frameworks into gRPC services, enabling payment components to be reused across the broader payments ecosystem - this is the bridge from maintenance into systems design
• Implement security-critical features involving encryption, PCI compliance, and sensitive payment data handling
• Optimize performance of transaction processing pipelines where latency directly affects whether a customer completes a purchase
• Incrementally steer legacy codebases toward modern C++ practices (RAII, ownership semantics, safe string handling) without breaking the payment flows that depend on them
• Design and implement comprehensive testing including unit tests, integration tests, and fuzz testing for security-critical components
• Debug and resolve production issues in systems with complex interdependencies and real operational takes
• Collaborate with payment operations teams to onboard new payment methods and gateway providers
• Ensure compliance with PCI-DSS and other financial industry standards
• Participate in on-call rotation for production payment system support

WHAT YOU NEED TO KNOW (or TECHNICAL SKILLS)
• 7+ years of professional C++ development experience in production environments
• Modern C++ fluency
• Strong understanding of systems programming, including memory management, concurrency, and performance optimization
• Ability to reason about undefined behavior, and its practical consequences across platforms
• Systematic debugging methodology
• Toolchain understanding and cross-compilation concerns
• Proficiency with build systems - Bazel experience highly valued;
• Experience working with legacy codebases older than 10 years - ability to understand, respect, and incrementally modernize existing systems
• Experience with or strong interest in payment processing or financial transaction systems
• Deep knowledge of security best practices
• Proficiency with AI-assisted development tools (e.g., Claude, Codex) with mature judgment - uses AI as an accelerator that requires human verification, especially in codebases with undefined behavior where AI-generated code can appear correct and still be wrong
• Understanding of HTTP/HTTPS protocols and RESTful API design
• Experience with Linux/Unix environments
• Rust experience or genuine interest in learning it
• gRPC experience or familiarity with service decomposition from monolithic architectures
• Payment gateway integration experience (Chase Paymentech, Braintree, Adyen, or similar)
• PCI-DSS compliance knowledge and implementation experience
• Experience with platform migrations (e.g., Windows to Linux, MSVC to Clang)
• Bazel build system expertise
• Performance profiling experience
• Experience with shared memory, IPC frameworks, or low-level concurrency primitives
• Kafka or other event streaming platforms experience
• OpenSSL/cryptographic libraries hands-on experience
• Familiarity with AI-powered code review and static analysis tools
• Awareness of security considerations when using AI tools with legacy or under-documented systems

YOU (BEHAVIOURAL SKILLS)
• Approaches legacy systems with respect and curiosity, recognizing the constraints and decisions that shaped them
• Takes time to understand existing systems before proposing improvements or modernization
• Continuously improves code and systems incrementally while maintaining stability
• Balances modernization efforts with the realities of production environments that require high reliability
• Demonstrates a strong security-first mindset, especially in systems handling sensitive transactions
• Understands the critical nature of payment processing and the need for accuracy, resilience, and uptime
• Navigates complex systems with care, ensuring minimal disruption while driving improvements
• Shows enthusiasm for evolving legacy systems into modern, scalable solutions
• Systems thinker who can reason across layers - from compiler optimization to cache behavior to network latency to business impact
• Strategic modernizer who understands incremental improvement over wholesale rewrite and can articulate when to pay down technical debt versus when to live with it
• Security-conscious developer who treats buffer safety, memory safety, and integer correctness as default concerns, not afterthoughts
• Pragmatic problem solver who can work within the constraints of legacy systems while steadily steering them forward
• Growth-oriented engineer who starts in maintenance but is motivated to grow into systems design, gRPC service architecture, and broader payments ecosystem work
• Collaborative communicator who explains reasoning clearly, asks good clarifying questions, and engages as a peer - can disagree constructively and change their mind when presented with new information
• Detail-oriented professional who understands the operational stakes of financial transaction processing
• Systems thinker able to reason across layers - from low-level performance (compiler optimization, cache behavior, network latency) to overall business impact
• Strategic modernizer who prioritizes incremental improvement.