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Plinth

AI-powered grant management and nonprofit operations

Full Stack Engineer

Full-Time
£90k - £110k/yr+ Equity
Mid
Bachelor's
London, UK
In PersonWork regularly from the Old Street office.
Software EngineeringFull-Stack Engineering

About the job

Requirements
  • Broad exposure to technology and the ability to work across frontend, backend, and DevOps areas.
  • Multiple years of experience shipping code and managing complex systems.
  • Ability to build reusable infrastructure with sensible interfaces that team members can build on.
  • Willingness to take complex features from initial idea through production maintenance.
  • Familiarity with React.
  • Experience with Git, agile methods, and software testing.
Responsibilities
  • Write frontend and backend code in TypeScript.
  • Shape the architecture for new and existing features.
  • Build tools that support onboarding new customers and migrating them from existing systems.
  • Fix bugs and support the customer success team with user issues.
Desired Qualifications
  • A Computer Science degree is ideally preferred but is not a hard requirement.
  • Experience with Elasticsearch is ideally preferred.
  • Experience in the charity sector through employment, volunteering, or trusteeship is ideally preferred.

About the company

Plinth is a social impact technology platform for organizations in the charity sector, including charities, CICs, foundations, and local authorities. It unites grant writing, case management, CRM, booking, volunteer management, surveys, payments, and impact reporting in one system. The AI Grant Writer analyzes past submissions and funder guidelines to craft personalized funding applications, while funders can run due diligence using Charity Commission data and financial documents. Plinth aims to streamline the entire funding cycle—from applying for grants to reporting outcomes—so nonprofits, foundations, and councils can secure funding and demonstrate impact efficiently.

Company Size

11-50

Company Stage

Early VC

Total Funding

$240K

Headquarters

London, United Kingdom

Founded

2023

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Simplify's Take

What believers are saying

  • Plinth claims 1,500+ organisations and 60+ funders managing over £200m annually.
  • The 2025 AI Grant Writer launch expands acquisition through immediate grant productivity.
  • UK local-authority demand rose with 2026 Crisis and Resilience Fund workflows.

What critics are saying

  • Blackbaud, Salesforce, Beacon, and Donorfy pressure Plinth across fundraising and CRM.
  • AI grant writing depends on trust in autogenerated applications and document handling.
  • If council and funder budgets tighten by 2026, Plinth’s paid conversion stalls.

What makes Plinth unique

  • Plinth unifies grant writing, case management, CRM, and reporting for UK third sector.
  • Its UK-first platform serves charities, councils, foundations, and CICs in one workflow.
  • Plinth’s free-forever tier lowers adoption friction for small charities and CICs.

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Benefits

  • Company Equity

Growth & Insights

Headcount

6 month growth

0%

1 year growth

24%

2 year growth

24%