Tech stack

Kinetix gives every service its own language on purpose: one domain, eleven idioms, and contracts that have to hold between all of them. The versions below are the ones pinned in each repository’s manifest or lockfile, not the ones its README mentions; a version with no evidence in the repository is left out rather than guessed.

Services

Each service owns its database and is reached only through gRPC from other services, or through the gateway from outside.

identityGitHub ↗

Accounts, authentication, tokens, merchant approval

Language

TypeScript5.5.4

Runtime

Bun1

Framework

NestJS11.2.1Fastify5.12.1

gRPC

@grpc/grpc-js1.14.4

Data

PostgreSQL16TypeORM1.1.0

Tests

Jest30.4.2

catalogGitHub ↗

Products and categories

Language

Python3.14

Framework

Django6.1Django REST framework3.18.0

Runtime

Gunicorn23.0.0

gRPC

grpcio1.83.0

Data

PostgreSQL16psycopg3.3.4

Tests

pytest8.4.2

Quality

mypy1.18.2

pricingGitHub ↗

Prices, discounts, vouchers, flash sales, shipping rates

Language

Rust1.88

Framework

Rocket0.5.1

Runtime

Tokio1.53.1

gRPC

Tonic0.11.0prost0.12.6

Data

PostgreSQL16Diesel2.2.12diesel-async0.5.2

Tests

cargo test

orderGitHub ↗

Cart, checkout, orders, returns

Language

C#

Runtime

.NET10

Framework

ASP.NET CoreKestrel

gRPC

Grpc.AspNetCore2.67.0

Data

PostgreSQL16EF Core10.0.12Npgsql10.0.3Redis7.2StackExchange.Redis2.8.24

Tests

xUnit2.9.3Moq4.20.72

paymentGitHub ↗

Payments, escrow, wallet

Language

Java21

Framework

Spring Boot3.5.16Tomcat10.1.59

gRPC

grpc-java1.68.2

Data

PostgreSQL16Spring Data JPALiquibase

Tests

JUnit Jupiter6.1.3Mockito5.14.2

Tooling

Gradle8.12

warehouseGitHub ↗

Bin inventory, stock reservation, fulfilment tasks

Language

Ruby4.0.6

Framework

Rails8.1.3.1

Runtime

Puma8.0.2Thruster0.1.23

gRPC

grpc1.84.0

Data

PostgreSQL16pg1.6.3Solid Queue1.6.0

Quality

Sorbet0.6.13421

Tests

RSpec Rails7.1.1

matchingGitHub ↗

Courier allocation and dispatch

Language

Elixir1.20.2Erlang/OTP29.0.3

Framework

Phoenix1.8.12Bandit1.12.5

gRPC

grpc1.0.5

Data

PostgreSQL16Ecto SQL3.14.0Postgrex0.22.4

Tests

ExUnit

reviewGitHub ↗

Product reviews

Language

PHP8.5

Framework

Laravel13.29.0Octane2.19.1

Runtime

FrankenPHP

gRPC

grpc/grpc1.82.0

Data

PostgreSQL16Eloquent

Tests

Pest4.7.8

notificationGitHub ↗

Customer notifications

Language

Scala3.3.4

Runtime

JDK21

Framework

http4s Ember0.23.30Cats Effect3.5.7fs23.11.0

gRPC

grpc-java1.69.0fs2-grpc2.7.21

Data

PostgreSQL16Doobie1.0.0-RC6Flyway11.8.2

Tests

munit-cats-effect2.0.0

Tooling

sbt1.10.7

communicationGitHub ↗

Real-time chat

Language

C++23

Framework

Drogon

Messaging

mqtt_cpp13.2.3

gRPC

gRPC C++

Data

TinyORM0.38.1

Tests

GoogleTest1.15.2

Tooling

CMake3.25+vcpkg

searchGitHub ↗

Product search

Language

Go1.26.4

Framework

chi5.3.2

gRPC

grpc-go1.84.0

Data

Typesense30.2typesense-go3.2.0PostgreSQL16pgx5.11.0sqlc

Tests

testify1.12.1

Edge, contracts and clients

The gateway is the only door from the internet. The contracts are the only definition of a message on the wire. The courier app is the first client.

api-gatewayGitHub ↗

The only entry point from the internet: routing, CORS and rate limits, declared in Pkl and run without a database.

Engine

Kong Gateway3.9

Tooling

Apple Pkl0.32.1

contractsGitHub ↗

The single definition of every message on the wire, published as a package for each language that consumes it.

Language

Protocol Buffersproto3

Tooling

Bufv2 configprotoc plugins29.3

Generated for

TypeScriptPythonC#JavaRubyPHPGo

courier-mobileGitHub ↗

The courier app: assigned deliveries, proof of delivery and live location, through the gateway.

Language

Dart3.10+

UI

Flutterstable

Framework

provider6.1.5get_it9.2.1dio5.11.0Hive2.2.3

Tests

flutter_testmocktail1.0.5

Platform

Shared middleware every service may use, and the machinery that lets services trust each other.

data

PostgreSQL for each service's own database, Redis for the order service's carts, Typesense for the search index.

Data

PostgreSQL16Redis7.2Typesense30.2

trust

Services prove who they are to each other with certificates carrying SPIFFE IDs, issued by step-ca. Secrets are encrypted at rest with SOPS and age.

Engine

step-caSPIFFEmTLS

Tooling

SOPS3.13.3age1.3.2

observability

Metrics in Prometheus, logs shipped by Promtail into Loki, dashboards and alerting in Grafana.

Engine

Prometheus2.54.1Loki3.1.1Promtail3.1.1Grafana11.2.0

Delivery

How code becomes a running system.

containers

Every service ships as a container image, and environments are described with Docker Compose.

Engine

DockerDocker Compose5.5.1Buildx0.37.1

pipelines

Repositories build, test and scan themselves on GitHub Actions, with GitLab CI on the mirror.

Engine

GitHub ActionsGitLab CI

Quality

gitleaks8.30.1Trivy

infrastructure

Servers are declared with OpenTofu, and part of the operational tooling is written in D.

Engine

OpenTofu1.12.6

Language

DLDC 1.43.0

Planned

Not built yet. Recorded here so the direction is visible: native customer apps on both mobile platforms, one backoffice for every service, and a recommendation service.

customer-android

Customer app for Android, written natively.

Language

Kotlin

UI

Jetpack Compose

customer-ios

Customer app for iOS, written natively.

Language

Swift

UI

SwiftUI

backoffice

One operator console for every service, built on the APIs each service owns.

Language

TypeScript

Framework

TanStack StartReact

recommendation

Product recommendations, as its own service with its own data.

Language

R

This site

kinetix-docsGitHub ↗

This documentation: static pages, interactive diagrams as islands, two languages.

Framework

Astro7.3.4Starlight0.42.3

UI

Svelte5.57.1

Runtime

Bun1.3.14TypeScript6.0.3

Hosting

Vercel