Company profile

Plain Tech Stack

API-first, AI-native customer support platform for technical teams

Software Development London 11–50 employees Founded 2020 Privately Held

Plain builds an API-driven customer support platform with AI agents at its core, running on TypeScript, React and GraphQL over a serverless AWS footprint (Lambda, EventBridge, DynamoDB, RDS). Dual model use of OpenAI and Anthropic plus RAG, paired with job-post concerns about AI accuracy and observability, shows the team prioritizing reliable, measurable AI output. Senior-heavy hiring split between engineering and marketing points to scaling the product and launch motion together.

Tech Stack 36 technologies

Core StackSlack PostgreSQL Figma React TypeScript GraphQL AWS Cloudflare Datadog Terraform Vercel Ashby OpenAI Anthropic RAG n8n Zapier AWS Lambda AWS RDS DynamoDB Discord PostHog Linear Justworks OpenAI API Google Analytics 4 Google Search Console Screaming Frog AWS Amplify EventBridge+6 more

What Plain Is BuildingChallenges and projects from their job posts

◆Challenges

Ensuring AI accuracy and reliability
Achieving observability into AI behavior
Scaling system architecture
Replacing slow, manual, disconnected support workflows

▲Active Projects

AI agents and assistants
Backend services for AI integration
AI evaluation pipelines
GTM strategy and platform positioning for launches
Sales enablement system

Hiring Activity

Accelerating3 roles · 1 in 30d

Department

Engineering

Marketing

Seniority

Senior

Lead

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About Plain

Plain is a London-headquartered software company founded in 2020 that offers a customer support platform built around AI and a developer-facing API. It targets support, operations and customer success teams, including those serving technical audiences, with multi-channel support and internal tooling capabilities. The company is privately held with 11–50 employees and hires in the United Kingdom and the United States. Its stack spans TypeScript, React, GraphQL, PostgreSQL and AWS services, with Terraform, Datadog and Cloudflare supporting infrastructure.

HeadquartersLondon

Company Size11–50 employees

Founded2020

Hiring MarketsUnited States, United Kingdom

Frequently Asked Questions

What tech stack does Plain use?

Plain uses TypeScript, React, GraphQL and PostgreSQL on AWS (Lambda, RDS, DynamoDB, EventBridge), with Terraform, Datadog, Cloudflare and Vercel, plus OpenAI, Anthropic and RAG for AI features.

Is Plain hiring engineers?

Yes. Plain's hiring is accelerating, focused on senior and lead engineering roles alongside marketing, with openings in the United Kingdom and United States.

What is Plain working on?

Plain is building AI agents and assistants, AI backend integration services and AI evaluation pipelines, while developing go-to-market strategy, positioning and sales enablement for launches.

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How this profile is built

Plain's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.