Fullstack & Security Infrastructure Engineer

About Hands In Hands In is a London-based fintech pioneer building the payment infrastructure that helps global airlines and travel companies rescue millions in lost revenue. Our platform enables customers to split high-ticket purchases seamlessly across multiple cards, payment methods, and people right at checkout. Backed by over £1M in funding and partnered with massive global travel ecosystems we are scaling rapidly. We are now looking for an ambitious, security-minded engineer who wants to wear two hats: writing clean product features in TypeScript and taking core ownership of our cloud security and infrastructure foundations.

• Location: Fully Remote (UK Working Hours)
• Salary: £30,000 - £40,000 per year
• Stack: TypeScript, NestJS, Next.js/React, AWS (SST/CDK), PostgreSQL, DynamoDB

The Opportunity This is a high-growth, high-impact hybrid role. If you are a Fullstack Engineer who is tired of working in an isolated silo where you "just write components," and you want to truly master how enterprise-grade, PCI-compliant infrastructure is architected and secured on AWS, this is your launchpad. You will work directly on high-volume financial transaction networks, learning how to bridge the gap between application logic, high-performance dashboards, and strict network isolation.

What You'll Do (Responsibilities)

• Product & Dashboard Engineering: Build lightning-fast merchant dashboards and real-time analytics platforms capable of fetching, caching, and rendering thousands of high-velocity transactions seamlessly using TypeScript.
• Network & Cloud Security: Architect and maintain secure, public-isolated AWS environments using VPCs, subnets, and strict security groups to guarantee our production and database layers are completely locked down.
• Scale Webhook Architecture: Design event-driven, high-availability ingestion systems using AWS serverless patterns to absorb massive transaction spikes and securely process asynchronous webhooks (handling out-of-order execution cleanly).
• Payment Page Integrity: Implement client-side script monitoring frameworks (utilizing tools like SRI and strict CSP protocols) to preserve the cryptographic integrity of checkout flows and prevent frontend tampering.
• PCI DSS Compliance Ownership: Learn and implement top-tier compliance strategies (like advanced tokenization) to completely isolate cardholder data from our primary application servers, keeping our core audit scope highly efficient.

What You Need (Requirements)

• TypeScript Fluency: Strong backend capabilities with Node.js/NestJS and solid frontend skills (React/Next.js). You think naturally in TypeScript types.
• AWS & Infrastructure Curiosity: Production exposure or strong hobbyist familiarity with core AWS services (VPCs, SQS, DynamoDB, Lambda, IAM) and a strong desire to master Infrastructure as Code (SST/CDK).
• Security-First Paradigm: You don't view compliance or security as a boring checklist, you view it as a core marker of code quality.
• Extreme Attention to Detail: Absolute precision in following engineering documentation, layout specifications, and execution instructions.

Tech Environment

• Languages & Frameworks: TypeScript, NestJS, React, Node.js
• Data Layer: PostgreSQL, DynamoDB, MongoDB
• Cloud Infrastructure: AWS (managed via SST / CDK TypeScript infrastructure code)

How to Apply (Read Carefully) To build financial transaction networks, exceptional attention to detail is a non-negotiable trait. Because of this, we do not accept or review 1-click LinkedIn applications, emailed CVs, or direct messages. To be considered for this role, you must apply by filling out our initial technical screening form here: 👉 https://forms.gle/c7GZobJWC16JJD5CA

CRITICAL: Applications submitted via any method apart from the Google Form link above will be immediately archived and will not be considered.