Job Description

Responsibilities

• We need someone who can address these problems, improve code quality, and ensure that our integrations (Betsoft, Endorphina, SoftSwiss) operate reliably under high-volume conditions
• Express.js and TypeScript
• TypeORM for database interactions
• TypeDI for dependency injection
• routing-controllers for API endpoints
• Betsoft Integration: Complex bet distribution logic, potential race conditions, and inconsistent error handling
• Endorphina & SoftSwiss Integrations: Duplicate decimal handling, excessive logging (using console.log), and convoluted rollback logic in SoftSwiss
• Testing & Code Quality: A high number of linting errors and test failures (unit tests pass, but E2E and integration tests indicate numerous failures)
• There is also a need for comprehensive unit tests, improved error handling, and dependency updates
• *RESPONSIBILITIES:**
• Audit & Refactor Code:
• Simplify and clarify bonus redemption, playthrough, and rollover logic
• Refactor complex methods into smaller, maintainable functions
• Remove commented-out/dead code and replace console.log statements with proper logging solutions
• Enhance Transaction Handling:
• Implement transaction isolation to prevent race conditions—especially in bet/win operations, bonus handling, and balance updates
• Improve Test Infrastructure:
• Fix existing linting issues and update the test suite to ensure accurate reporting
• Write additional unit tests to cover edge cases (e.g., partial refunds, session timeouts)
• Review and update out-of-date packages (e.g., AWS SDK maintenance warnings)
• Improve inline documentation and provide clear setup instructions for future maintenance
• Experience with updating and maintaining complex backend systems
• Ability to communicate clearly and provide detailed documentation
• We will supply a Windows Server VM in the nearest region that our cloud provider has to your location
• ALL WORK is required to be done within this VM, including code reviews and repository clones
• We will supply licenses to use Claude 3.7 and GitHub Copilot in the IDE (code completions and chat feature)
• *TECHNICAL NOTES AND GUIDANCE**
• Evaluate logic of bonus redemption, bonus playthrough and bonus rollover (crediting of completed bonus funds to player’s real-money balance) to ensure that the math and results produce logically correct outcomes, even if the tests appear to be passing (as the tests themselves may be flawed.)
• Evaluate transaction code and ensure transaction isolation to eliminate possible race conditions, such as multiple actions coming in at the same time for the same user
• This is especially important in operations that affect balances, such as spins (bet/win operations), tracking bonus playthrough progress, and rolling over of completed bonus funds into the user’s balance
• Dependencies are out of date in many cases
• A general review and update of dependencies will be required
• NOTES - BETSOFT INTEGRATION
• The code that decides how to distribute a bet across different sources (ledger, bonuses) appears complex and could be prone to edge cases
• Some operations might be vulnerable to race conditions if multiple requests come in for the same user simultaneously
• Add more unit tests for edge cases (e.g., partial refunds, session timeouts)
• Code simplification, especially around balance tracking
• Better validation of inputs from the Betsoft provider
• Improved error handling throughout
• Additional logging for production troubleshooting
• NOTES - ENDORPHINA AND SOFTWSWISS
• Replace console.log with proper logging
• Add transaction isolation
• Refactor complex methods into smaller, focused functions
• Add more comprehensive error handling
• Add more validation of incoming data
• Implement proper unit tests for edge cases
• NOTES - SOFTSWISS SPECIFIC
• Refactor the rollback logic completely
• Remove commented-out / “dead” code
• Improve transaction tracking
• NOTES - ENDORPHINA SPECIFIC
• Improve session management documentation
• Enhance bonus validation logic
• There are many linting errors that prevent the tests from running without overrides
• All of these will need to be repaired for optimal code quality

Requirements

• *REQUIRED SKILLS AND EXPERIENCE:**
• 3+ years of experience with Node.js and TypeScript
• Proficiency with Express.js, TypeORM, and dependency injection frameworks (e.g., TypeDI)
• Strong background in REST API development and familiarity with decorator-based routing (routing-controllers)
• Experience with Redis for session management and handling financial transactions
• Prior experience in the gaming/gambling domain or similar transaction-heavy environments
• Excellent debugging skills and ability to work on legacy codebases with existing tests
• Experience with integrating game provider APIs (e.g., Betsoft, Endorphina, SoftSwiss)
• Familiarity with automated testing frameworks (Jest, supertest) and continuous integration
• For example, during runtime of tests, we see several warnings that the AWS SDK for Javascript has been in maintenance mode since 2023
• Tests: 64 passed, 64 total