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Overseas Payment Risk Control Manager (Chinese Speaker)
Shenzhen, Guangdong Province, China · Remote OK
Mid level
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Full-time
Competitive Salary, Professional Development, Career Growth
Posted 28d ago
~40 hrs/week
Responsibilities
Develop backend services and engines for slot machines and casual games, focusing on betting, settlement, and wallet integration. Perform numerical validation using Monte Carlo simulations and conduct pre-launch code auditing to ensure security and fairness.
Requirements
Requires 3+ years of backend experience in the iGaming/slots domain with proficiency in Kotlin and distributed systems. Must have strong fundamentals in high concurrency, idempotency, and financial security to prevent double-debits and over-payouts.
Full job description
On behalf of our client, a fast-growing iGaming company, we are seeking a dynamic Game Backend Development Engineer.
In this role, you will be responsible for developing the backend services for slot machines and casual games (80%), with secondary responsibilities including pre-launch code auditing and anti-arbitrage investigation (20%).
What You'll Do
Game Backend Development (Primary) : Develop backend services and engines for slot machines / casual games (including provably-fair titles) — betting, settlement, idempotency, state machines, seed commitment/reveal, and wallet/operator integration. Numerical values (RTP, odds, weights) are designed by data scientists; you are responsible for accurate implementation and validation.
Numerical Validation : Ability to use Monte Carlo simulations to verify that actual RTP matches the design target; ability to reverse-engineer payout tables and calculate expected value for cross-verification — you don't design the numbers, but you are accountable for whether the numbers got skewed during engineering implementation. Requires basic comfort with probability/statistics, and the ability to understand the data scientist's models and map them to code.
Security by Design : Build red lines into the code during development — seeds must not leak, results must be server-authoritative, idempotency scope must be correct, payout caps must actually be enforced, and amounts must use fixed-point arithmetic, never floating-point.
Code Auditing (Secondary) : Participate in pre-launch static reviews, base conclusions on the code that will actually be deployed, and produce actionable tickets that the team can execute directly.
Requirements
3+ years of backend development experience for slots / casual games : Have worked on backend for slots (online casino), crash games, provably-fair games, or similar — understand that settlement, idempotency, and state transitions in this domain are not ordinary CRUD.
Kotlin : Primary server-side language; must be proficient . Experience with microservices / RPC architecture.
Redis : caching / distributed locks / atomic operations; understand that it expires, can be evicted, and can lose data during failover
NoSQL (DynamoDB / Cassandra, etc.): data modeling and concurrent writes
ClickHouse (or similar columnar / OLAP databases): data writing and querying
High Concurrency : atomic operations, race conditions, read-modify-write pitfalls
Idempotency : understand the essential difference between request-level vs operation-level idempotency (this is critical for financial security)
Distributed systems failure reasoning : It's not enough to just know how to use Kafka, Redis, and NoSQL — you need to be able to reason through failure states when these components are combined — how to reconcile when a two-phase settlement fails midway, how to guarantee at-least-once downstream doesn't double-debit, what can go wrong during master-slave failover / untrusted clocks. Knowing how to use components ≠ being able to reason about how they fail together.
Automated testing capability : Beyond happy-path unit tests — be able to design tests for concurrent race conditions, out-of-order delivery, duplicate delivery, and edge cases; understand which bugs (e.g., double-debits, RNG deviations) cannot be caught by unit tests and require integration or statistical validation; past bugs must be locked down with regression tests.
Financial security awareness : Use fixed-point / smallest currency units for amounts; never use floating-point; be clear on how to prevent double-debits, over-payouts, and duplicate claims during betting/settlement/payout.
Uses AI coding tools with judgment : Regularly use AI coding tools (Claude Code, Cursor, etc.) for development — the key is being able to review AI output, spot its mistakes, and take ownership of every line of code — not letting AI do the work for you. We are an AI-native engineering team; this is a collaboration method, not optional.
What We Value Most
Closing the loop between business and code : Ability to break down vague requirements into MECE (mutually exclusive, collectively exhaustive) implementation paths, accounting for edge cases and exceptions — not just shipping the happy path and calling it done. People with clear thinking tend to produce high-quality code.
Ground truth is deployed code : Comments can lie, documentation lags behind, verbal "it's fixed" doesn't count — conclusions should be pinned to "this line is written this way"; also able to read unfamiliar code and trace data flows to identify root causes (the essence of auditing and troubleshooting).
Observability mindset : Know the weight of adding the right logs — able to aggregate by player/round, trace requests with correlation IDs, and never log sensitive fields in plaintext. When things go wrong, logs are the only tool to rewind and reconstruct the truth.
Conservative by default, assume client hostility : Write every API with the assumption that someone will craft malformed requests, replay requests out of order, or bypass idempotency; when it comes to money and fairness, list every suspicious point rather than assuming it's safe.
Nice-to-Haves
Familiar with Python / Node.js (engine side uses Python, operations systems use Node.js);
Background in security / anti-fraud, or experience with anti-arbitrage;
Familiar with AWS (Lambda, etc.) and cloud-native technologies;
Hands-on experience with identifying and fixing game arbitrage or financial vulnerabilities in production.
What We Offer:
A competitive salary and benefits package.
Extensive opportunities for professional development and career growth within a fast-paced, growing company.
Related keywords
KotliniGamingSlot MachinesProvably FairKafkaRedisDynamoDBCassandraClickHouseMicroservicesRPCMonte Carlo SimulationsFixed-point ArithmeticIdempotencyDistributed SystemsAWS
Lestars Management Consultancy LLC has been incorporated in March 2022 in Dubai, United Arab Emirates. This is a platform which seeks to become a real business partner that assist clients in pursuing Global Business Development. Since the founding of the firm, every consultant at M/s Lestars Management Consultancy LLC is striving to provide consulting services that makes us a “Real Business Partner” for our clients. We are one place for all business solutions. We assist business’s operations to provide a smooth working environment for obtaining the goals and objectives by using minimum and cost effective resources. No matters how difficult the challenge or how long the process to provide the best solution, we thoroughly examine our clients’ operations to enables them to achieve their goals, based on their extensive experience and knowledge accumulated through serving clients operating in every industrial sector. we deliver the best practice to each client, taking account of different culture aspects and business customs of each country. It is our policy to continue to work closely with each client with a sense of commitments on a long term basis to ensure that the best practice are integrated into its operations.
Lestars Management Consultancy LLC has been incorporated in March 2022 in Dubai, United Arab Emirates. This is a platform which seeks to become a real business partner that assist clients in pursuing Global Business Development. Since the founding of the firm, every consultant at M/s Lestars Management Consultancy LLC is striving to provide consulting services that makes us a “Real Business Partner” for our clients. We are one place for all business solutions. We assist business’s operations to provide a smooth working environment for obtaining the goals and objectives by using minimum and cost effective resources. No matters how difficult the challenge or how long the process to provide the best solution, we thoroughly examine our clients’ operations to enables them to achieve their goals, based on their extensive experience and knowledge accumulated through serving clients operating in every industrial sector. we deliver the best practice to each client, taking account of different culture aspects and business customs of each country. It is our policy to continue to work closely with each client with a sense of commitments on a long term basis to ensure that the best practice are integrated into its operations.