Sonnet Code

Ship yourroadmap fasterwith SeniorFull-Stack Engineers

Senior engineers — timezone-aligned with the US and fluent across AI, web, mobile, and cloud. On your team in days, not months.

Fluent in the stack your team already ships on — or is about to.
AI Training

Train frontier AI with
expert humans in the loop.

We're the team AI labs call for senior domain specialists — producing the SFT data, preference signal, and adversarial evaluations that move a model from capable to state of the art.

Data Labeling & Annotation

High-quality human labels across text, image, video and audio with strict QA.

TextImageVideoAudioMultimodal

RLHF & Preference Data

Rankings and rubric-graded critiques to align models on tone and safety.

RLHFDPOPreference PairsRubrics

Expert Prompting & SFT

Domain experts write gold-standard prompts and responses for fine-tuning.

SFTCodeMathSTEMLegalMedical

Model Evaluation

Custom eval sets and side-by-side human judgment at scale.

EvalsBenchmarksA/B

Red-Teaming & Safety

Adversarial prompting and jailbreak discovery to harden behavior before ship.

AdversarialJailbreaksPolicy

Agent & Tool-Use Training

Multi-turn trajectories and tool-call traces for reliable autonomous agents.

AgentsTool UseTrajectories

Every stage of the build.
One senior team.

Everything we do
01 / 06
Front-End Development.
SDLC Stage
Stage 01

Front-End Development

Build modern frontends designed for performance, accessibility, and scale.

Capabilities

Fluent in your stack.

We ship in the languages, frameworks, and platforms your product is already on — no retooling, no "let us learn it on your time."

Ruby on RailsNode.jsJavaReact.NETPythonC#PHPAndroidiOSGolangVue.jsC++JavaScriptSwiftAngularTypeScriptRustRuby on RailsNode.jsJavaReact.NETPythonC#PHPAndroidiOSGolangVue.jsC++JavaScriptSwiftAngularTypeScriptRust
Ruby on RailsNode.jsJavaReact.NETPythonC#PHPAndroidiOSGolangVue.jsC++JavaScriptSwiftAngularTypeScriptRustRuby on RailsNode.jsJavaReact.NETPythonC#PHPAndroidiOSGolangVue.jsC++JavaScriptSwiftAngularTypeScriptRust
Our commitments

Standards.Six promises every engagement starts with.

No tier surcharges, no swap-outs mid-project, no surprises on the invoice. What you sign is what you get.

See how we work
senior engineers only • senior engineers only •
100%
senior
engineers
TALENT
BAR
Senior engineers only, vetted in under 10 days
CODE
REVIEW
Every PR reviewed by a second senior before merge
◆ Response
Under 4-hour response on business days, always
CADENCE
Weekly demos and monthly roadmap reviews with stakeholders
average onboarding time • average onboarding time •
48h
average
onboarding
OWNERSHIP
Full source and infrastructure ownership from day one
PRICING
Fixed hourly rates, no tier-ups or hidden surcharges

Four things
we don't compromise on.

The perfect people

Senior engineers only. Every one of them has shipped production software we'd stand behind — and we interview each one personally before they ever see your codebase.

The perfect team

From a single senior engineer embedded in your codebase to a full multi-squad engagement. You decide the shape; we staff it with the exact people we'd put on it.

The perfect place

We overlap your working day, write and meet in English, and run in your tools — your Slack, your PR process, your rituals. No bolt-on project-management layer.

The perfect time

Onboarded in days, not weeks. Scope up or down by the sprint when priorities shift — no renegotiation, no tier surcharges, no surprises on the invoice.

Software
engineers
QA
engineers
UX
designers
Data
scientists
Your next hire shouldn't take three months.

Our process.
Scope,agree,ship.

Engineer working
Step 1

Start with a short call.

Thirty minutes to understand what you're building, who's on your side of the table, what success looks like, and the stack and timeline you're working against. No pitch deck, no sales script.

Step 2

Agree on scope and team.

Within a few days we lock scope, the engagement model, and the exact engineers we'd put on the work. You meet them before anything gets signed.

Step 3

Onboard in days and ship weekly.

We plug into your tools and rituals — standups, PR review, Slack — and write production code from week one. You get a live demo every week and a single point of contact.

Field notes from the team.

All articles on technology and talent

MaiAgent Stood Up at VivaTech on June 19 and Told Enterprises to Stop Building RAG and Agent Stacks From Scratch — A Vendor With 100+ Production Customers Across Financial Services, Healthcare, Manufacturing, and Aviation Publicly Reframing the Default From 'Build the Platform' to 'Buy the Platform, Build the Domain Logic on Top' Is the Cleanest Signal This Year That the Generic Agentic-Infrastructure Layer Just Commoditized — Here's the Build-vs-Buy Decision the Teams We Talk to Are Now Re-Running on Their Q3 Roadmap.

Anthropic Opened Its Seoul Office on June 17 and Walked Out With NAVER on Claude Code Org-Wide, Samsung SDS in Enterprise Pilot, Kakao on the API, and a Ministry of Science and ICT MOU on AI Safety — All Five Days After the US Export-Control Directive Cut Korean Access to Fable 5 and Mythos 5, Meaning the Largest Asia-Pacific Claude Code Rollout Anthropic Has Ever Announced Is Running on Opus 4.8 Not the Top of the Stack, and What That Says About Where 'Claude Code at Scale' Actually Wins.

Anthropic Pulled Fable 5 and Mythos 5 Globally on June 12 Under the First US Export-Control Directive Ever Applied Directly to an AI Model — Production Teams That Had Migrated Onto Fable 5 in the 72 Hours Since Its June 9 Launch Lost Their Top-Tier Coder Mid-Sprint at 5:21pm ET, Anthropic Disabled Both SKUs Inside the Hour Because It Cannot Verify User Nationality in Real Time, and the 'Pick the Smartest Model and Wire It In Hard' Default Just Got Repriced With a Sovereign-Risk Tail Most Procurement Spreadsheets Don't Yet Have a Column For.

Need senior engineers on your roadmap this month? Fifteen minutes tells us both.

Team working together