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AI Engineering Studio

We wrap your stack
with production AI.

RethinkAI plugs into the tools your team already runs, adds durable AI pipelines on top, and retires the analyst work that eats your week. Fixed scope, shipped in weeks, owned by your team from day one.

Book a callSee our work

Engineering and automation

8+yrs

3+ years shipping production AI

Working software in

Week 1

Not month three

Agentic AI agents in production

200+

Autonomous, multi-step, across client stacks

Built by engineers who ship production AI, not consultants with slide decks.

Next.jsTypeScriptPostgreSQLInngestAnthropic ClaudeVerceln8nSalesforceHubSpotClerkResendPlaywright

Build vs hire

The fastest way to staff this is not to staff it.

Most teams post the job ad and wait. We ship while the interviews are still running.

RethinkAI

Shipped to production in 2 to 4 weeks

In house hire

90 to 120 days to hire a senior AI engineer

RethinkAI

One fixed project price, no overruns

In house hire

A six figure salary plus recruitment fees and overhead, before a line of code

RethinkAI

A documented system your team owns

In house hire

A permanent role on payroll you still have to manage

Talk to us before you post the job ad

01What We Build

Engineering capabilities, end to end

We start by understanding how your team actually works. Every delivery ends with systems that run without you.

See it in production

What we automate

  • Lead routing and CRM enrichment
  • Document processing and data extraction
  • Automated reporting and dashboards
  • Customer support triage and deflection
  • Onboarding and HR workflow automation

AI Automation Pipelines

Your team is copying data between systems by hand, updating the CRM from spreadsheets, and rebuilding the same report every Friday. We turn those multi step manual processes into event driven pipelines that run without supervision: CRM enrichment, weekly reporting packs, invoice and document processing, lead routing, and data sync across the tools you already use.

We architect pipelines that ingest from multiple sources, enrich records with AI, apply business rules, and push results into your CRM or data warehouse. Every pipeline is idempotent, fully observable, and recovers automatically when something upstream breaks.

Deliverables

  • End-to-end pipeline architecture and production implementation
  • Event-driven orchestration via Inngest or n8n
  • Automated retry logic, dead-letter handling, and alerting
  • Live monitoring dashboard with error visibility
Inngestn8nPostgreSQLWebhooks

Custom AI Agents

Not chatbots. Agents that do real multi step work: lead qualification, analyst research, document classification, support triage, and data extraction. Built on Claude, GPT, and purpose fit models, they decide and act within the guardrails you set.

We design agents that take on the repetitive, high-judgment work your team does by hand. Lead qualification, document analysis, data research, decision support. They plug into your existing tools, stay within the guardrails you define, and ship with an evaluation framework so you know exactly how accurate they are.

Deliverables

  • Agent architecture with tool use, memory, and structured output
  • Integration with your existing data sources and APIs
  • Safety guardrails and human-in-the-loop checkpoints
  • Promptfoo evaluation suite to measure and track accuracy
ClaudeGPTAgentKitTypeScript

Full-Stack Web Applications

Production platforms on Next.js, React 19, and PostgreSQL. SaaS products, internal tools, client portals. Real code shipped to real users.

We build complete web applications from database schema to deployed product. The stack is opinionated for speed and maintainability: Next.js and TypeScript on the front end, PostgreSQL for data, Vercel for hosting. Every application ships with authentication, role-based access control, real error handling, and a codebase your team can own.

Deliverables

  • Full-stack Next.js application with strict TypeScript
  • PostgreSQL schema design, migrations, and query layer
  • Authentication and role-based access control
  • CI/CD deployment pipeline with zero-downtime releases
Next.jsReact 19TypeScriptPostgreSQL

Strategy and Audit

We map your operations, score every process for automation potential, and hand back a ranked roadmap before a single line of code is written. And if you have already bought AI tools but are not seeing results, we audit the stack you have, find the gaps, and hand back a ranked plan for what to fix first.

Before we build anything, we study how your team actually works. We identify the bottlenecks, quantify the time cost of each, and score each process against realistic automation feasibility. You get a prioritised roadmap with honest timelines, build-versus-buy recommendations, and ROI estimates grounded in your actual numbers.

Deliverables

  • Current-state process mapping and bottleneck analysis
  • Automation opportunity scoring with time and cost estimates
  • Prioritised implementation roadmap ranked by ROI
  • Technology recommendations with trade-off analysis
Process DesignROI AnalysisStrategy

New service

GEO and AI Visibility

Your buyers now ask ChatGPT, Claude, Perplexity, and Google AI Overviews who to hire. We make sure the answer is you.

Generative Engine Optimisation (GEO) is SEO for AI answer engines. We engineer your site so large language models can read, trust, and quote it: structured data, an llms.txt knowledge file, answer shaped content, and the entity and authority signals AI systems weigh when they decide who to cite. Then we track how your brand shows up in AI answers over time, so you can watch your share of voice move.

Deliverables

  • GEO audit with a 0 to 100 AI visibility score and a prioritised fix list
  • Structured data, llms.txt, and content engineered for AI extraction
  • Entity and authority signals that make your brand citable by AI
  • Ongoing AI share of voice tracking across ChatGPT, Claude, Perplexity, and Gemini
Schema.orgllms.txtPerplexityClaude

Works with your stack

Plugs into the tools you already run.

We onboard to your existing stack. No rip and replace. If you use it and it has an API, we connect it. If it does not, we build the bridge.

CRM
SalesforceHubSpotPipedriveZohoDynamics 365CloseCopper
Finance and Payments
XeroQuickBooksSageNetSuiteStripePayPalSquareGoCardlessWiseChargebee
Comms and Productivity
Microsoft 365TeamsOutlookGoogle WorkspaceGmailSlackNotionZoomDiscord
Support
ZendeskIntercomFreshdeskHelp ScoutFront
Project and Ops
AirtableMonday.comClickUpAsanaJiraLinearTrelloBasecampSmartsheet
Marketing and Email
MailchimpKlaviyoActiveCampaignSendGridResendBrevo
Data and Warehouse
PostgreSQLSnowflakeBigQueryDatabricksRedshiftSegmentFivetran
Automation and Dev
InngestZapierMaken8nGitHubGitLabWebhooksREST APIs
E-commerce
ShopifyWooCommerceBigCommerceSquarespaceMagentoWebflow
HR and Hiring
BambooHRHiBobGreenhouseWorkableLeverPersonioRippling
Docs and Storage
DocuSignPandaDocDropboxGoogle DriveAdobe Sign

02The Stack

The stack we build on

Every tool earns its place. Battle-tested primitives first, specialised platforms only when they reduce complexity. Active across current and recent engagements. We onboard to client-mandated tooling without friction.

See it in production

You do not need to know any of this. We pick the right tool for your process and document everything, so your team can own it.

Languages
TypeScriptJavaScriptPythonGoRustSQLNode.js
Frameworks and UI
Next.jsReactVueSvelteAstroRemixTailwind CSSshadcn/ui
Backend and APIs
ExpressNestJSFastAPIDjangoFlaskGraphQLtRPC
Data and Storage
PostgreSQLMySQLMongoDBRedisClickHouseSnowflakeBigQuerySupabaseNeonPrismaDrizzleElasticsearchpgvectorPinecone
Cloud and Infra
VercelAWSGoogle CloudAzureCloudflareNetlifyDockerKubernetesTerraformGitHub Actions
AI and Models
Anthropic ClaudeOpenAIGoogle GeminiMeta LlamaMistralCohereHugging FaceOllamaPerplexity
AI Tooling and Agents
Inngest AgentKitLangChainLangGraphVercel AI SDK
Automation and Orchestration
Inngestn8nTemporalZapierMakeApache Airflow
Observability and Quality
SentryDatadogPostHogGrafanaPrometheusPlaywrightVitestJest
Auth and Security
ClerkAuth0WorkOS

03Selected Work

Shipped to production. Measured in outcomes.

Every engagement is a full build: architecture, production deployment, and support after it goes live.

Start a project
InsuranceAI AgentInngestPostgreSQLNext.js

Analyst Intelligence Platform

120+

Analyst hours automated monthly

A national insurance brokerage had analysts pulling figures from a dozen systems, reconciling them in spreadsheets, and producing weekly reports by hand. We replaced the entire workflow with an event-driven pipeline and an AI agent that researches, classifies, and surfaces insights automatically.

Outcomes

  • More than 120 analyst hours a month automated end to end
  • Weekly reporting pack ready every morning, untouched by hand
  • AI classification accuracy above 95 percent on held-out test data
  • Live monitoring dashboard with per-run cost and accuracy tracking
B2B SaaSData PipelineAIWebhooksTypeScript

CRM Enrichment Engine

12,000

Records enriched weekly

A B2B SaaS company needed contact and account data enriched continuously as records flowed in. We built a multi-stage pipeline that scores, deduplicates, and enriches records using AI signal extraction, then writes structured results back via webhook. The pipeline processes roughly 12,000 records per week with zero manual steps.

Outcomes

  • 12,000 records enriched per week with no manual input
  • AI signal extraction with 88 percent recall on benchmarked test set
  • Deduplication layer eliminating duplicate records on ingest
  • Full observability: cost, latency, and error rate per pipeline run
Service businessNext.jsSaaSPostgreSQLStripe

Operations SaaS Platform

6weeks

Spreadsheets to production SaaS

A service business was managing bookings, scheduling, and invoicing across spreadsheets and WhatsApp threads. We built a complete SaaS platform with client-facing booking flows, automated scheduling logic, a self-service portal, and integrated payments. Live in six weeks.

Outcomes

  • Full booking and scheduling workflow automated end to end
  • Client self-service portal with real-time status updates
  • Invoicing and payment collection integrated with Stripe
  • Admin dashboard with business analytics and daily reporting

Client names withheld under NDA. We will walk through the specifics on a call.

04About RethinkAI

A studio built for the way AI actually works

Founded by Jack Costanzi, RethinkAI is a senior engineering studio that turns the hours your team loses to repetitive work into leverage.

Work with us
8+ yrsEngineering and automation
12+Production AI systems shipped
No juniorsSenior engineers only
FlexibleEngagement model

One client's reporting and reconciliation work was eating more than 120 hours of analyst time a month. We replaced it with a pipeline that runs overnight, so the pack is ready before the team logs in, untouched by hand.

We work with companies that have outgrown spreadsheets and manual processes but have not yet built an in-house AI engineering team. We step in, build the right thing, and hand you a system your team can own.

RethinkAI is led by Jack Costanzi, a hands-on engineer who builds the systems we ship: durable pipelines, AI agents, and the full-stack tools around them. We have put complete AI stacks into production for venture-backed and established companies, and only senior engineers touch client work. Client names are held under NDA, and we are happy to walk through the work on a call.

“The best automation is invisible. You stop thinking about the process because it simply works.”

Jack Costanzi, on how we build
Jack Costanzi|Founder, RethinkAI Consult

How we work

01

Strict TypeScript

No any types, no shortcuts. Type safety cuts entire bug categories before they reach production.

02

Event-driven architecture

Systems that react instead of poll. Durable execution means nothing fails silently in the background.

03

AI as first-class tooling

Models are designed in, not bolted on. We automate what AI is genuinely good at and keep humans in the loop where it matters.

04

Ship fast, iterate faster

Working software in week one. Tight scope, incremental deploys, outcomes over effort.

05

Clean handover

Every project ships with full documentation, a working CI/CD pipeline, and a codebase your own developers can maintain. We write code for the team who inherits it.

05FAQ

Common questions

Ask us directly

06Get in touch

Tell us what is eating your week.

Grab a 20-minute intro call below. No commitment, we give you an honest read on whether we can help and what it would take.

Projects run from £5,000 for a focused pipeline to £50,000 for a full product. We work flexibly with each team, and every engagement starts with a written proposal.

  • We sign a DPA. Your data stays in region where your infrastructure allows.
  • You own the code on day one: repo, infrastructure, runbooks.
  • We build for your real data, not a clean demo.
Within 24 hoursResponse time
No commitmentFirst call
Flexible, fixed priceEngagement

Prefer to write directly? jack@rethinkaiconsult.com