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collateral-management

margin and collateral platforms

Broadridge, Calypso (Nasdaq), CloudMargin, AcadiaSoft, Euroclear/Clearstream triparty services

SystemTechniques · 11Primitives · 39 collateral-management Durable workflow executiondistributed · medium: Ordinary code made crash-proof by logging every side-effect result and replaying the code from that log; activities run at least once, workflow logic must be deterministic.›Sensitivity based initial margineconomics · medium: Initial margin from risk-factor sensitivities with prescribed weights and correlations (SIMM style)Delivery versus paymentfinance · medium: Atomic exchange of securities and cash so neither leg settles without the otherPayment state machinefinance · medium: Persisted state machine for a payment lifecycle (authorize, capture, void, refund) that treats timeouts as unknown, retries with the same key and applies webhooks idempotently.›Mixed-integer programming (branch a…optimization · medium: Solves LPs with integer variables by solving the LP relaxation, branching on a fractional variable, and pruning subtrees whose LP bound cannot beat the incumbent.›Tamper-evident audit logsecurity · medium: An append-only log whose Merkle root, signed per batch, lets anyone verify an entry is present and history was never rewritten, with log-size proofs.›Rete rules enginesystems · medium: Match many rules against changing facts by caching partial matches in a shared network, so each change only does the work it actually affects.›Event sourcingfinance · low: Persist state changes as an append-only stream of immutable events per entity; current state is a fold over them, guarded by expected-version appends.›Double-entry ledgerfinance · low: Append-only journal of transactions whose postings sum to zero per currency; balances are derived, so money can only move, never appear or vanish.›Iso 20022 messagesfinance · low: ISO 20022 XML payment and securities messages (pacs, pain, camt, sese): structure and validationIdempotency keysfinance · low: Client-chosen unique key per logical operation, stored with a request fingerprint and the final response, so retries replay the first result instead of acting twice.›Simplex methodoptimization · low: Solves linear programs by walking along the edges of the feasible polytope from vertex to vertex, one basis swap (pivot) at a time; the workhorse behind MIP solvers.›Currency cross rate triangulationfinance · low: Deriving cross rates through a base currency with correct precision, inversion and spreadsMoney representationfinance · low: Store money as integer minor units with an explicit currency exponent, compute in wider integers, and round once with a named rounding mode.›Reconciliationfinance · low: Match internal ledger records against bank and processor statements by reference, then amount and date window; every unmatched or mismatched item becomes an exception.›Sequenced multicast feednetworking · low: Exchange order-by-order data as fixed binary messages in sequenced UDP multicast packetsBusiness day calendarssystems · low: Holiday calendars, business-day adjustment rules (following, modified following) and settlement cyclesRecord replaydistributed · low: Record every nondeterministic input (time, randomness, I/O, model and tool outputs, per-tick player input) and re-execute deterministically for debugging, replays and state rebuildHierarchical timing wheelsystems · low: Timers bucketed by expiry into wheels of slots, coarser wheels for far deadlines: O(1) insert and cancel for millions of timeouts.›Exponential backoff with jittersystems · low: Retry after delays that grow geometrically and are randomized, so failed clients spread out instead of hammering a recovering service in synchronized waves.›Hierarchical state machinesystems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.›d-ary heapdata-structures · low: Array heap with d children per node (d = 4 typical): half the binary heap's depth, siblings in one cache line, faster priority queues.›Merkle treedata-structures · low: Hash tree for verifying and diffing large datasets with logarithmic proofs+ 4 more techniques+ 23 more primitives

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