engineering
Engineering Case Studies
Long-form architecture write-ups from the TRAGenX engineering desk — how systems like these are designed at the depth we operate. Capability pieces, not client reports.
Backtesting and Strategy-Simulation Infrastructure for Trading Systems
A reference architecture for building leak-free, deterministic strategy-simulation infrastructure: point-in-time data, execution modeling, and reproducible distributed replay.
- Event sourcing
- Point-in-time data model
- Parquet / columnar storage
- Vectorized + event-driven simulation
- Distributed compute (Ray/Spark-style)
- Deterministic replay
- Time-series storage
- Idempotent job orchestration
Architecting a Multi-Currency Wallet and Balance Service
How a wallet and balance core is designed so every credit, debit, and FX conversion stays correct, auditable, and safe under concurrent access.
- Double-entry ledger
- PostgreSQL
- Event sourcing
- Idempotency keys
- Outbox pattern
- gRPC
- Kafka
Architecting a Multi-Rail Settlement and Reconciliation Engine
A reference architecture for reconciling ledger intent against what payment rails actually confirm, across ACH, RTGS, cards, and correspondent banking.
- Event sourcing
- Double-entry ledger
- Kafka
- ISO 20022
- Idempotency keys
- Outbox pattern
- PostgreSQL
- Saga orchestration
Architecting a Real-Time Fraud and Risk-Scoring Pipeline
How to score every transaction in-line under a hard latency budget, without sacrificing feature freshness, auditability, or the ability to retrain safely.
- Kafka
- Flink
- Feature store
- gRPC
- Redis
- Gradient-boosted trees
- Rules engine
- Event sourcing
Idempotent Payment APIs: Exactly-Once Settlement Semantics
How to design a payment API that survives retries, timeouts, and duplicate submissions without ever double-moving money.
- Idempotency keys
- PostgreSQL
- Outbox pattern
- Event sourcing
- Two-phase state machine
- Kafka
- Distributed locking
An Event-Sourced Audit Ledger for Financial Transactions
How to architect a financial ledger where every balance is a projection of an immutable event log, not a mutable row — and why regulators tend to like that.
- Event sourcing
- CQRS
- Kafka
- PostgreSQL
- Optimistic concurrency
- Idempotency keys
- Snapshotting
Architecting a Low-Latency Order-Matching Engine
A reference design for the core of any trading venue: a deterministic, single-writer matching engine built for predictable tail latency, not just low average latency.
- Price-time priority matching
- Single-writer / LMAX-style architecture
- Event sourcing
- Ring buffer sequencer
- Binary session protocol
- Snapshot + replay recovery
- Multicast market data
- Kernel bypass networking
Designing a KYC/AML Screening and Case-Management Pipeline
A reference architecture for sanctions/PEP screening, risk scoring, and analyst case management in regulated fintech onboarding flows.
- Event sourcing
- CQRS
- Fuzzy name matching
- Kafka
- PostgreSQL
- Elasticsearch
- Outbox pattern
- Rules engine
Architecting a High-Throughput ISO 20022 Payments Switch
A reference design for a payments switch that routes ISO 20022 messages across rails at scale, with idempotency, replay-safe state machines, and clean degradation under partner outages.
- ISO 20022
- Kafka
- PostgreSQL
- gRPC
- Idempotency keys
- Circuit breakers
- Event sourcing
- Protocol adapters
Designing a Double-Entry Ledger Core for High-Volume Payments
A reference architecture for a double-entry ledger that stays balanced, auditable, and fast under sustained payment load — the invariants, data model, and scaling choices that matter.
- Double-entry accounting
- PostgreSQL
- Event sourcing
- Idempotency keys
- gRPC
- Kafka