Founding engineers
when AI stops scaling

Scope project See our client work

MVP to rebuild, runway to beat, legacy business to rewire with AI. Whatever shape your problem takes, we can ship all of it.

Trusted by forward-thinking
teams worldwide
Rain Pura 8Fleet chargeFUZE LoanBud J.D. Power ResiQuant DealOps Camber Atrix Spaceium MissionCriticalSaaS Deep Sky Semble AI Paratus Health
NetSave Sweetpix Telluscope Triangle Intrinsic Veraset Singles Live Observable Space sFOX Reviva Exia Labs Volta Andera Puzzle Onlook
You know the nightmares,
We’re here to rescue.
Here's what our engineers solved
Production rebuild
Rebuild it right
Talk to the engineer writing your code
Meet your team
MVP to scale on one codebase
Keep your code
Shipping production code since 2009
See our LinkedIn

What "founding engineers"
actually means here

YOU OWN THE CODE
WE ARGUE WITH YOU
WE STAY THROUGH SCALE

You own the code

Your repo. Your AWS. Your Linear. We work inside your stack, not inside a black box we control.

Your RulesYour InfrastructureYour data
SlackGitHubZapierDiscordNotionStripeAirtableGmail
StripeNotionSlackAirtableGmailGitHubDiscordZapier
DiscordAirtableGmailZapierSlackNotionStripeGitHub

We argue
with you

We push back on bad specs and feature creep. The way a co-founder would. Not the way a vendor would.

Pushback on specsScope controlProject judgment
spec-review.ts
// we push back before we buildfunction reviewSpec(spec) { if (spec.scopeCreep) return flag("scope-creep"); if (!spec.hasOwner) return flag("missing-owner"); if (spec.overEngineered) return simplify(spec); return approve(spec);} // ship only what moves the metricconst plan = spec.features .filter(f => f.impact > f.cost) .sort((a, b) => b.impact - a.impact); deploy(plan, { env: "production", flag: "new-checkout" }); // we push back before we buildfunction reviewSpec(spec) { if (spec.scopeCreep) return flag("scope-creep"); if (!spec.hasOwner) return flag("missing-owner"); if (spec.overEngineered) return simplify(spec); return approve(spec);} // ship only what moves the metricconst plan = spec.features .filter(f => f.impact > f.cost) .sort((a, b) => b.impact - a.impact); deploy(plan, { env: "production", flag: "new-checkout" });

We stay
through scale

Many of our clients raised their next round on what we shipped. Same team carries it to Series A and beyond.

0%Faster understanding of unfamiliar code
RESPONSE TIME(P95)
0ms↗ +12.5%
SYSTEM UPTIME
0%↗ +3.1%

Stuff we crush with an
AI-native workflow

LLMs and AI Agents

IoT at scale

Fixing / scaling the vibe code

Product design that converts

We've helped clients from Silicon Valley solve complex challenges.

ResiQuant raises $4M to revolutionise property insurance with AI-powered insights.

$4M

Seed Funding

4

Catastrophe Perils Supported

99%

US Property Coverage

ResiQuant helps insurers assess catastrophe risk faster and more consistently by automating property underwriting with AI.

See customer story
Spartan product engineering services

PARATUS HEALTH

Paratus Health raises $2.3M Seed Round to Turn Wait Times into Proactive Patient Care.

$2.3M

Seed Funding

Paratus Health builds generative-AI voice agents for healthcare practices, automating the phone lines — scheduling, insurance verification and patient intake — straight into the EHR.

See customer story
Spartan product engineering services

Onlook has raised a total funding of $500K over 1 round.

$500K

Seed Funding

YC W25

Y Combinator batch

Onlook is an open-source visual editor for React: designers and engineers work on a live canvas while the real codebase stays the source of truth, with every edit syncing back to the files.

See customer story
Spartan product engineering services

Rain raises $250M Series C to scale stablecoin-powered payments for global enterprises.

$250M

Series C, led by ICONIQ

$1.95B

Valuation

200+

Companies on the platform

Rain is stablecoin payments infrastructure: one API through which companies issue Visa cards, run digital-dollar accounts and settle across borders.

See customer story
Spartan product engineering services

sFOX has raised $22.8M to build institutional crypto trading infrastructure.

$22.8M

Total raised

2014

Operating since

sFOX is an institutional crypto prime broker, unifying execution across venues with custody and settlement through its own regulated trust company.

See customer story
Spartan product engineering services

Volta Circuit introduces a multi-signature wallet with $4.1M in seed funding.

$4.1M

Seed, led by Fika and Haven

2024

Announced

Volta Circuit is a non-custodial multi-signature wallet for institutional digital-asset operations, with governance policies enforced on-chain.

See customer story
Spartan product engineering services

Dealops secured $7M to power pricing in the AI era.

$7M

Led by Pear VC and General Catalyst

2025

Announced

Dealops is agentic CPQ for RevOps and sales — AI agents stand up a pricing instance in hours and build quotes for reps.

See customer story
Spartan product engineering services

Camber raised $4M to put scientific computing within reach of every researcher.

$4M

Seed, led by Base10

2024

Founded

Camber is a cloud platform for computational science — run simulations, analyse large datasets and train models on scalable GPUs, now with agents that work directly against your data warehouse.

See customer story
Spartan product engineering services

Genuine effort, meaningful change

Fast and correct — choose 2

Fast and correct — choose 2

Ready to build?

Founder-minded engineers.
Business-driven execution.

Scope project

Don’t trust our words

“Our company faced challenges with an established codebase. The Spartan engineers impressed me with their organized processes and enthusiasm. Their tailored onboarding eased my concerns about remote resources, and I'm proud to have them on our team.”
Jane JeongCo-founder & CTO @ REVIVA · Former software engineer @ Zoom & AWS
Jane Jeong