Senior Java Developers

W3NUTS
Department Icon IT / Software Development & Related
Posted: 8 months ago
7-9 years
Rajkot, Gujarat
IT / Software Development & Related
work from office
Full Time
Posted: 8 months ago
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Job Description

  • We are hiring 7+ years experienced Senior Java Developers to work on a Java-based real-money gaming platform undergoing a major architectural upgrade.
  • The core scope includes multi-currency wallet support, FX conversion and rate locking, payment and game aggregator integrations, and admin platform modernisation.
  • This is not a standard CRUD project. The role requires deep understanding of financial systems, transactional integrity, and audit-grade correctness.
  • Must-have skills
  • Java 11+
  • Spring Boot (deep experience)
  • Wallet / ledger systems
  • Payment gateways (Stripe, Adyen, etc.)
  • Multi-currency payments (Deposit / withdrawal flows)
  • REST API and Webhook integrations & processing
  • Multi-currency balance management
  • FX conversion systems
  • BigDecimal precision handling
  • Database schema evolution & migrations
  • Transaction isolation & locking
  • Audit trails & reconciliation
  • Should have
  • Gaming / betting platforms (High-volume bet simulations)
  • Regulatory / financial audit experience
  • Key Responsibilities
  • 1. Wallet & Financial Systems
  • Design and maintain a multi-currency player wallet
  • Ensure accurate balance handling using high-precision arithmetic
  • Implement atomic, thread-safe balance updates
  • Maintain the wallet as the single source of truth
  • Design and enforce audit-ready transaction records
  • 2. FX Conversion & Rate Management
  • Integrate external FX rate providers with caching and fallback
  • Implement FX rate locking per game round or session
  • Persist FX rates with all relevant transactions
  • Ensure deterministic and auditable currency conversions
  • Handle provider currency limitations safely and consistently
  • 3. Game Provider & Aggregator Integrations
  • Integrate and maintain multiple game providers and aggregators
  • Handle wager placement and settlement across mismatched currencies
  • Validate provider callbacks and settlement data
  • Ensure idempotent handling of provider events
  • Map external game rounds to internal wallet transactions
  • 4. Payment Provider Integrations
  • Integrate 812 payment providers (deposits & withdrawals)
  • Implement secure webhook handling with retry safety
  • Handle multi-currency payment flows
  • Ensure reconciliation between payment providers and wallet balances
  • Manage failure, rollback, and retry scenarios safely
  • 5. Admin Platform & Configuration Logic
  • Refactor admin logic (e.g., global rebate configuration)
  • Support admin panel relabeling and configuration simplification
  • Ensure backend logic aligns with admin UI changes
  • Support currency display and configuration consistency
  • 6. Security, Reliability & QA Awareness
  • Implement secure API integrations and key management
  • Support SMS and OTP service integrations
  • Design systems resilient to external API failures
  • Participate in reconciliation testing and edge-case validation
  • Prevent double processing, race conditions, and silent balance corruption
  • 7. Documentation & Collaboration
  • Contribute to API documentation (English)
  • Maintain clear internal documentation for wallet, FX, and integrations
  • Communicate risks, assumptions, and edge cases clearly
  • Work closely with frontend, QA, and product teams
  • Apply on [HIDDEN TEXT]
  • Thank you
  • W3NUTS

Skills

AuditAudit TrailsFinancial AuditQaSafetyTransaction

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