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What we do — the manifest
01
Product engineeringdesign -> ship
We own the full arc: discovery, system design, UI, and the release pipeline. One team holds the model from the first migration to the production deploy — no handoff seams, no half-built MVPs left to rot.
02
Backend & infrastructureschema-first systems
Relational data modeling, typed ORMs, versioned migrations, object storage, and webhooks that survive retry storms. We build the parts users never see so the parts they do see never break.
03
AI integrationapplied, not bolted-on
Model routing, streaming pipelines, document parsing, and grounded reasoning over real operational data. We treat AI as a co-pilot inside the product — accountable, scoped, and built around the JOIN, not the prompt.
04
Compliance-grade systemstrust as a feature
Role-based access, tenant isolation, provenance tracking, e-signature flows, and audit trails. For software handling contracts, budgets, and confidential assets, correctness is the product — we engineer for it from day one.
02 / 04
Flagship — built & operated by TDH
tdh@systems:~$ cat ./grace.status
> grace_production_os // loading manifest...
domainfilm & television production
surfacescript -> schedule -> call sheet -> set
modulesbreakdown · budget · vault · compliance
ai_layerparse · reason · co-pilot
tenancymulti-org · RBAC · provenance
> status: ● live in production
tdh@systems:~$
// case study
Grace Production OS
A production-management platform for film & television crews — it turns a screenplay into a schedule, a budget, and the call sheet a 1st AD sends every night, with an AI co-pilot reasoning over the whole production.
Visit Grace →03 / 04
About the studio
A small, senior team that ships its own products — and yours.
TDH Systems — corporate brand Thy Dark Hour — is an India-based software & product-engineering studio founded by Siddharth Agrawal. We are the engineering arm behind Grace Production OS, and we take a deliberately small number of client product-engineering engagements where we can own the architecture and stand behind what we ship.
// selected work
Grace Production OS
Flagship · SaaS
● live
AI co-pilot & parsing layer
Internal · AI
● live
Billing & multi-tenant access
Internal · Infra
● live
Client engagements
Selective · Build
open
04 / 04
Start a build
// let's architect it
Have a system that needs to be built right the first time?
hello@thydarkhour.com →Replies within two working days · IST