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securitization

Finance and trading | securitization — MBS/ABS issuance and administration: loan-level pooling and eligibility, cash-flow waterfall engine, bond administration and investor reporting, loan-level disclosure files, payment distribution through depositories

Common Securitization Platform (Fannie Mae + Freddie Mac, UMBS), Intex deal models

SystemTechniques · 24Primitives · 92 securitization DAG workflow executiondistributed · medium: Run a graph of dependent tasks by releasing each one when its inputs are done, longest chain first, and skip any task whose input hashes are unchanged.›Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›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.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Delivery versus paymentfinance · medium: Atomic exchange of securities and cash so neither leg settles without the otherLeast squares monte carlofinance · medium: Longstaff-Schwartz regression for early-exercise options in Monte CarloCoverage-guided fuzzingsecurity · medium: Mutate inputs, run an instrumented target, and keep any input that reaches a new code edge; feedback turns blind guessing into incremental search.›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.›Monte Carlo integrationnumerics · low: Estimate an expectation by averaging random samples; error falls as σ/√N in any dimension, and variance reduction (antithetic, control variates, importance sampling) shrinks σ.›Idempotency 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.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesMultiple decrement projectioneconomics · low: Project pool balances with competing decrements (prepayment, default) by period and ratePriority waterfall allocationeconomics · low: Applying incoming payments to fees, interest and principal in a defined priority orderStochastic interest rate modelseconomics · low: Short-rate models (Vasicek, CIR, Hull-White) simulated or calibrated to the curveDay count conventionsfinance · low: ACT/360, ACT/365, 30/360, ACT/ACT accrual fractions for interest and couponsLargest remainder roundingfinance · low: Splitting an amount into parts that sum exactly (largest remainder / Hamilton) for allocations, splits and prorationsLoan amortizationfinance · low: Annuity, interest-only and balloon schedules with exact rounding of the final paymentMoney 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.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Dual control approvalsecurity · low: Four-eyes / maker-checker approval with quorum policies for sensitive operationsMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Row-level security (multi-tenant is…security · low: Append a policy predicate to every query inside the database, so a forgotten WHERE tenant_id = ? in application code cannot leak another tenant's rows.›+ 17 more techniques+ 76 more primitives

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In-house systems

Named systems of this kind at large companies, with their paper or write-up.

Common Securitization Platform (CSS joint venture)Fannie MaeCommon Securitization Platform (CSS joint venture)Freddie Mac