🏦  argent‑android  _{retail digital banking}

Multi‑module Kotlin/Compose. Foundation shipped — convention plugins, a currency‑safe domain layer with tests, Hilt‑wired app, green CI. Next: the offline transfer state machine (offline‑sync‑engine behind WorkManager), biometric Keystore, cert pinning.

kotlin compose multi‑module offline‑first fintech

🧩  basis‑kmp  _{shared Kotlin core · Android + iOS}

One financial core — valuation, cost basis, allocation — shared via Koin, with fully native Compose and SwiftUI UIs. Domain + tests done, Android app runs, iOS framework links. Ships SHARING.md: the module‑by‑module share‑vs‑native argument.

kmp compose swiftui koin ios

🧠  slate‑ai  _{on‑device + cloud notes assistant}

A real RAG pipeline in pure Kotlin — sentence‑aware chunking, embeddings, cosine retrieval — and a routing policy that keeps short lookups on‑device and only escalates to the cloud when the task needs it. 12 tests, Compose app.

on‑device‑ai litert rag compose

🏗️  modulith  _{Android architecture template}

Gradle convention plugins so a module build file is ~2 lines, plus a checkModuleGraph task that fails the build on module‑graph violations — verified catching a core → feature edge.

gradle convention‑plugins architecture ci

📡  argent‑track‑sdk  _{KMP analytics & attribution SDK}

A self‑contained KMP SDK replacing CleverTap + AppsFlyer — durable event queue, push/in‑app campaigns, install attribution, and a client‑side PII denylist. Android + iOS from one codebase.

kmp analytics attribution sdk

📱  argent‑ios  _{native Swift · MVVM}

SIP/investment, KYC, bank‑account & mandate flows with a generic token‑refreshing network layer. UIKit + SwiftUI.

swift mvvm fintech ios

📒  ledger‑core _{KMP library}

Double‑entry ledger: balanced journal entries, idempotent postings, a currency‑safe Money. 12 tests, JVM + iOS.

kmp ledger double‑entry

💳  pay‑sheet _{Compose module}

Card input with Luhn + brand detection, tokenization, a 3‑D‑Secure‑style step‑up state machine, PCI notes. 11 tests, sample app.

compose payments 3ds

🔄  offline‑sync‑engine _library

Durable queue, exponential backoff + full jitter, pluggable per‑operation conflict strategies. 9 tests.

offline‑first workmanager

🔐  mobile‑security‑notes _{lib + writeups}

Keystore AES‑GCM, BiometricPrompt + CryptoObject, deny‑by‑shape redaction (8 tests), cert pinning. Threat model + docs.

keystore biometrics redaction

⚡  android‑perf‑lab _{perf infra}

Baseline Profile + Macrobenchmark modules, pixel6Api34 managed device, a methodology where every number carries its device + iteration count.

baseline‑profiles macrobenchmark

🧪  compose‑lab _experiments

A custom Layout with the wrapping maths unit‑tested (5 tests), and a recomposition study that shows @Immutable skipping on screen.

custom‑layout recomposition

🤖  argent‑rag  _{bilingual RAG backend}

FastAPI + ChromaDB + MongoDB + Gemini. Language‑detecting retrieval, grounded generation, multimodal image queries — English + Hindi collections.

python fastapi rag gemini chromadb

🔁  argent‑http‑core  _{Ktor client factory}

Refresh‑on‑401 with careful failure classification — 401/403 force logout, 5xx/network keep the session. Optional‑bearer auth, pure unit‑tested decideRefresh. 9 tests.

ktor token‑refresh auth

🧭  argent‑checkout  _{MVI checkout state machine}

Pure‑Kotlin payment‑checkout state machine — three reducers driving every UPI flow. A when(checkoutType) scattered across 50+ places collapses into one CheckoutTypeConfigFactory; the reducer re‑derives SIP bank‑switches from the selected bank's mandates. 9 tests, no Android/Compose deps.

kotlin mvi state‑machine

📉  argent‑risk‑engine  _{credit-underwriting policy core}

Pure‑Python loan‑amount policy — SMS‑income waterfall, bureau servicing history, risk segmentation and a FOIR cap combine into a pre‑approved amount. Decile‑direction is declared per model so ascending and descending scorecards can't silently invert each other's risk bands. 26 tests, zero I/O.

python credit‑risk decision‑engine