Core Backend Engineer - Project White (Stablecoin & Digital Assets Ledger)

About GoTymeX

GoTymeX is the engineering, product, and design arm of the GoTyme Group, building and operating the software behind digital banking products for customers in South Africa, the Philippines, and expanding markets across Asia and Africa. Currently, you’ll be joining the team building a stablecoin and digital-assets wallet, enabling customers to hold, send, receive, save, and spend digital dollars through a familiar banking experience.

The financial core is being developed in stages. In the first phase, a managed CASP ledger remains the authoritative operational financial record. GoTyme will build immutable event and audit records, financial-control projections, and reconciliation capabilities around it. In the next phase, GoTyme’s event-sourced, append-only double-entry ledger will become the product and accounting source of truth.

The system must maintain correctness across vendor events, internal state, on-chain settlement, fiat payment rails, card settlement, fees, FX, holds, and operational exceptions.

The Role

We are seeking a hands-on Core Backend Engineer with deep expertise in financial systems and databases to build Project White’s ledger, posting, reconciliation, and financial-control capabilities. You will design and implement systems that calculate balances, record value movements, prevent duplicate or missing postings, and explain financial state changes. Collaboration will be key as you work closely with finance, treasury, risk, compliance, operations, vendor-integration engineers, and senior engineers shaping the wider financial-core design.

This is an online transactional-core role, not a reporting or data-warehouse position.

What You Will Do

• Build and enhance an event-sourced, append-only double-entry ledger, including account, journal, posting, balance, hold, fee, FX, and adjustment models.
• Implement posting rules and invariants to ensure journals remain balanced, prevent unauthorized value creation or loss, and provide a clear audit trail.
• Develop transaction-processing flows for authorisation, holds, capture, settlement, reversals, refunds, chargebacks, expiry, corrections, and controlled manual adjustments.
• Apply idempotency, deduplication, sequencing, and concurrency controls to payment, card, custody, and blockchain events that may arrive late or multiple times.
• Build reconciliation controls across the managed CASP ledger, Fireblocks, on-chain data, fiat ramps, card processing, treasury, accounting systems, and GoTyme’s financial-control projection.
• Design operational workflows for missing events, duplicate notifications, amount or currency mismatches, unbalanced postings, and suspense/repair processes.
• Contribute to event schemas, financial data contracts, versioning, replay, and backfill approaches to preserve the audit trail without corrupting balances.
• Collaborate with finance and treasury to create accounting evidence, GL exports, reserve and liquidity views, and audit/regulatory materials.
• Adopt best practices for schema design, migrations, indexing, partitioning, data retention, backups, recovery testing, and database performance.
• Participate in financial-core technical design and code reviews, sharing insights on ledger modeling, database correctness, and safe production practices.
• Own monitoring and production support for your components, contributing to reconciliation service levels, incident response, root-cause analysis, and controlled remediation.

Why Join

• Help build the financial foundations of a global stablecoin product as it transitions from managed external infrastructure to a GoTyme-controlled financial core.
• Solve complex database and distributed-systems problems where correctness protects real customer value.
• Work with senior partners across engineering, finance, treasury, risk, compliance, and operations.
• Shape the architecture and standards that keep the platform safe as it scales.

Requirements

Must-Have

• 5+ years of backend engineering experience, including hands-on work in payments, ledgers, accounting, settlement, core banking, or another high-integrity transactional system.
• Experience building, operating, or contributing significantly to a double-entry ledger, payment posting engine, settlement platform, core-banking subsystem, or equivalent financial system of record.
• Strong relational database and SQL skills, ideally with PostgreSQL or MySQL. Proficiency in schema modeling, transaction isolation, locking, concurrency, query performance, indexing, migrations, and recovery.
• Working knowledge of journals, debits and credits, chart of accounts, posting rules, available vs. settled balance, holds, reversals, adjustments, fees, FX, and reconciliation.
• Practical experience with idempotency, outbox/inbox patterns, event ordering, duplicate delivery, exactly-once-effect design, and failure recovery.
• Experience building reconciliations that compare internal and external records, identify discrepancies, retain evidence, and support controlled repairs.
• Strong Java or Python experience, with a track record of building and operating reliable production services.
• Experience with event-driven systems, including event replay, schema evolution, auditability, and eventual consistency.
• Clear technical communication skills to collaborate with finance, product, compliance, and operational partners to translate requirements into precise models and implementation decisions.

Strong Plus

• Experience in stablecoins, digital assets, crypto custody, exchange operations, or on-chain settlement.
• Experience reconciling custody or ledger records to blockchain transaction events, confirmations, fees, and failed transactions.
• Experience with Fireblocks, TigerBeetle, Modern Treasury, Mambu, Temenos, or similar financial-ledger or custody infrastructure.
• Experience in card issuing/processing, payment acquiring, cross-border payments, treasury, FX, or regulated banking.
• Experience with AWS serverless and event-driven services like Lambda, EventBridge, SQS, and Step Functions. Kafka is also valuable if used as the event platform.
• Experience designing data retention, partitioning, archival, and disaster-recovery approaches for financial records.
• Experience with accounting exports, general-ledger integration, audit evidence, regulatory evidence, and operational controls.
• Experience mentoring engineers or owning a defined financial-core component.

Technology and Ways of Working

You don’t need experience with every item below. Focus on applying the right patterns for a financial system of record.

• Financial Core: An event-sourced, append-only double-entry ledger, posting engine, financial-control projections, reconciliation control tower, and accounting evidence.
• Databases: Strong relational database skills are mandatory. PostgreSQL and MySQL are both relevant. Transactional correctness and performance matter more than the specific database brand.
• Events and Processing: AWS serverless patterns (Lambda, EventBridge, SQS, workflows). Kafka may be used where applicable. We use transactional outbox/inbox patterns and durable idempotency controls.
• External Records to Reconcile: Managed CASP operational ledger, Fireblocks wallet/transaction events, blockchain data, fiat ramps, card processing, treasury, and general ledger.
• Engineering Practice: Explicit financial invariants, peer review of financial changes, automated unit/integration/contract tests, controlled migrations, reconciliation monitoring, staged rollout, and incident readiness.

Benefits

At GoTymeX, opportunities are abundant for those aligned with our purpose and values. We offer:

• Competitive salary, including a 13th salary (pro-rata), performance-based bonuses, and equity participation in Tyme Group.
• Full benefits and salary rank during probation.
• Insurance coverage under Vietnamese labor law, plus premium healthcare for you and your family.
• Generous leave policy: 20 days annually (15 annual leave + 3 sick leave + 1 birthday leave + 1 Christmas leave).
• Meal and parking allowances covered by the company.
• Hybrid working model with flexibility to work from home or the office.
• Values-driven, international environment with an agile culture.
• Work-life balance with a 40-hour workweek (Monday to Friday).