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Product-Minded JavaScript Developer (Mid-Level)

fena • United Kingdom
Full Remote
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AI Summary

Fena is hiring a mid-level JavaScript developer to design, build and ship API-driven payment and commerce features. You will integrate third-party APIs, design Fena's own APIs and webhooks, debug production issues, write specs and docs, and speak directly with merchants and partners. Requires 3-5 years with JavaScript/TypeScript, Node.js and React, strong REST API, webhook and auth experience, fluency with AI coding assistants, product judgement, and clear written English.

Key Highlights
Design, build and ship API-driven payment and commerce features for merchants.
Integrate third-party APIs and design Fena's own APIs and webhooks.
Debug production issues end to end across code, providers, webhooks and merchant config.
Work daily with AI coding tools and review generated code carefully.
Fully remote, async-first role with real ownership and direct merchant contact.
Key Responsibilities
Turn a merchant problem into a shippable feature: scope it, sketch the API and data flow, build it, release it, watch how it's used.
Integrate third-party APIs and make them feel like one product.
Design and maintain Fena's own APIs and webhooks.
Work with AI coding tools daily and review their output carefully.
Debug production issues end to end.
Write short, clear specs and docs.
Talk to merchants and partners when needed.
Keep regulatory constraints in mind and know when to ask before shipping.

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Technical Skills Required
JavaScript Node.js React
Benefits & Perks
Fully remote, async-first
Real ownership
A seat close to the founder
Modern tooling and freedom to use AI assistants

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Nice to Have
Experience in payments, fintech, Open Banking or another regulated space.
Shopify app development, or other e-commerce platform integrations.
Familiarity with PostgreSQL, cloud deployment (AWS, GCP or similar) and CI/CD.
Experience with low-code or AI app-building platforms.
Experience working in a small or early-stage company.

Job Description

Annual pay: $25k – $36k

The role

Fena is looking for a mid-level JavaScript developer who thinks like a product person. You will design, wire and ship API-driven payment and commerce features, and you will own whether they actually work for the merchant on the other end.

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Job Overview
Posted Nov 06, 2026
Employment Full-time
Experience Mid-Senior level
Location United Kingdom
Category Programming
Company fena
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