mainloop.studio — backend development & engineering studio · SF · NYC

JUDGMENT ★ × AGENTS ★ = SHIPPED ★ JUDGMENT ★ × AGENTS ★ = SHIPPED ★ JUDGMENT ★ × AGENTS ★ = SHIPPED ★ JUDGMENT ★ × AGENTS ★ = SHIPPED

One senior.
Many hands.

The staffing model — without the bodyshop.

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A SENIOR ENGINEER

Owns the problem, the architecture and the review bar. One name accountable.

AN AGENT FLEET

The latest coding agents and models — drafts, tests, migrations and refactors, around the clock.

A SHIPPED BACKEND

Production in weeks, quality gated by suites and review.

Services

⚡

Need someone right now?

Production is down. The deadline is Friday. The contractor ghosted. We jump in same-day, get to root cause, and ship the fix.

Not just firefighting — a long-term project can start right away too.

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Backend development

APIs, data pipelines, event systems, storage — distributed systems designed for load and failure, owned from schema to deploy.

Python · FastAPI · Postgres · AWS

AI & LLM systems

Agent loops, RAG, prompt pipelines, evals — AI workflows that replace real manual work, measured before they ship.

DSPy · agents · RAG · evals

Algorithms & performance

Profiling, latency budgets, algorithmic design. We took a distributed trading system to #1 globally on speed.

C++ · Rust · low-latency

Low-level & systems

Win32/WinAPI internals, embedded down to 4 KB of RAM, real-time RF, hardware wallets.

C · C++ · Rust · WinAPI

Mobile app development

Native iOS & macOS in Swift/SwiftUI — or React Native when it fits. Shipped to the store.

Swift · SwiftUI · React Native

Numbers

20+YEARS OF C/C++ IN PRODUCTION

#1GLOBAL EXECUTION SPEED FOR ITS STRATEGY

½THE WORLD'S BUSES TRACKED BY OUR ALGORITHMS

4KBSMALLEST PRODUCTION RAM TARGET

What stays human

Architecture & tradeoffsThe calls that shape the next five years don't get delegated to a model.

Code review — every lineAI-written or not, a senior reads it before it merges.

Saying noTo scope creep, to shortcuts, to shiny tech that doesn't serve you.

The pagerWhen something breaks, a human who knows the system answers.

More work

monday.comBackend engineering for monday.com's platform.Backend

Magic.devLarge-scale GitHub crawler for a frontier AI code-gen lab.Data

In-houseDistributed crypto trading system, #1 globally on execution speed.Low-latency

NNustomDSPy few-shot optimization pipeline for code-gen performance.LLM

dWalletZero-knowledge-proof research for WebAssembly in the wallet stack.Crypto

Real-time RF receiver controllers in C++ for military-grade comms.Embedded

Airborne imaging systems in C++ across a multi-million-line codebase.C++

Studio

mainloop.studio is a senior engineering studio out of San Francisco, New York & Berlin, founded by an ex-Unit 8200 engineer. No account managers, no juniors, no handoffs.

Contact

Tell us the
hard part.

One email. No discovery-call maze. Same-day answer.

Let's do a 5-min call →