Senior WordPress & WooCommerce Developer

Aeternox Ltd is a UK-registered health technology company. We help men take control of their health through clinically accurate hormone testing and medication prescriptions, reviewed by a qualified doctor. We are a focused team building something with real ambition.A UK operation today, with plans to grow our physical presence internationally, including a base in Lahore.

We are at an early and exciting stage. The person we hire now will not be joining a company that is already built they will be one of the people who builds it. You will work closely with senior leadership, have direct input into technical decisions from day one, and lead junior and mid-level developers as the team grows.

THE CONTRACT

This is a long-term 12-month contract role paid monthly on a fixed retainer, directly to you. A mutual NDA is in place before any detailed briefing begins, full IP on all work produced belongs to Aeternox, and the notice period is 30 days on both sides.

There is a 90-day initial review period — we use it to make sure the work and the working relationship are right. We expect you to use it the same way.

Aeternox plans to establish physical operations in Lahore as the business grows. The role is fully remote for the foreseeable future, but we want people who see themselves as part of that chapter when it comes.

BEFORE YOU APPLY

If your background is mainly installing themes, configuring plugins, or building stores through a page builder, this is not the right role. We need someone who has written custom WordPress plugins from scratch, understands how WordPress and WooCommerce work under the hood, and writes PHP they would be comfortable with another senior developer reading.

We read every application carefully. The way you write tells us as much as the links you send.

WHAT WE NEED FROM YOU

→ You lead from the front. When junior developers are stuck, you unblock them. When something is going wrong, you say so early.

→ Your written and spoken English is strong and professional. All communication with the UK team is in English. At times you will liaise with our laboratory partners on API integrations — your spoken English must be confident and clear.

→ You take a detailed specification and run with it — asking the right questions upfront rather than surfacing problems at the end.

→ You are available 14:00 to 18:00 PKT to overlap with UK business hours. Outside of that, your time is your own provided the work is delivered.

→ You write code as though someone else will maintain it, because at some point they will.

→ You review junior work constructively — not just checking for errors, but helping them understand why.

→ You find the next problem before being told about it.

TECHNICAL SKILLS REQUIRED

WordPress & WooCommerce — 5+ years

• Custom plugin development from scratch using WordPress Plugin API and OOP PHP
• WooCommerce custom order statuses, lifecycle hooks, checkout field modification, and the WooCommerce REST API
• Extending WooCommerce My Account with custom tabs, role-based portals, and secure document access
• Custom WordPress user roles and granular capability management
• WP-Cron for scheduled automation, retry queues, and background processing

PHP & Backend — 5+ years

• Clean, well-documented object-oriented PHP following WordPress coding standards
• Custom REST API endpoints via the WordPress REST API
• HTTP webhooks using the WordPress HTTP API — HMAC-SHA256 signature verification, retry logic, and full database logging
• Structured error handling and logging
• Custom MySQL tables via $wpdb with correct indexes, activation hooks, and upgrade routines
• Database query optimisation as data volumes grow
• Secure file serving — cryptographic token access, .htaccess restriction, no direct file URLs
• Browser developer tools and server log debugging
• Basic testing awareness within a WordPress context

Payment & Integrations

• Hosted payment gateway integration — redirected flows, signed webhook confirmation, refund handling, test-to-live migration
• Third-party HTTP webhook integration — signed payloads, callbacks, retry queues, full attempt logging
• Affiliate tracking with WooCommerce coupon attribution and commission reporting

Email

• Transactional email via SendGrid or Mailgun through WP Mail SMTP Pro
• SPF, DKIM, and DMARC — setup, verification, and deliverability troubleshooting
• Custom PHP/HTML templates triggered by order status hooks

Security & Data Protection

• WordPress hardening — file permissions, HTTP security headers, login protection
• Two-factor authentication and role-based enforcement
• Consent logging, audit trail tables, role-restricted data access, and erasure workflows
• UK GDPR awareness — we will walk you through the specifics, but you must take data protection seriously from the first line of code

Frontend & Tooling

• HTML and CSS within a locked theme without touching theme files
• JavaScript for admin interfaces, dynamic checkout fields, and WooCommerce hooks
• Git with a proper branch strategy — clean history, pull requests, code review as standard
• Local to staging to production pipeline with verified backups and tested rollback

SEO & Analytics

• Yoast SEO, Google Analytics 4 via GTM, Google Search Console
• Core Web Vitals awareness — caching, image optimisation, performance basics

GOOD TO HAVE

• Experience with health, medical, or regulated data platforms
• AWS S3 — private buckets and pre-signed URLs
• Wordfence configuration and WordPress firewall management
• WordPress multisite familiarity
• UK or European client experience

WORKING ARRANGEMENT

• Fully remote from Pakistan — no travel or office attendance required
• Four hours daily overlap with UK business hours — 14:00 to 18:00 PKT
• Slack for communication, GitHub for all code, weekly video call with the UK team
• This is not a short project — if things go well, this grows
• Lahore office plans in the pipeline — the people we hire now are the ones we want there

HOW TO APPLY

Send the following to careers@aeternox.co.uk — every item is required:

• Your CV including your degree, institution, and graduation year
• Links to at least two live WooCommerce projects you personally built — if team work, say clearly what your contribution was
• A paragraph of five sentences on the most complex custom plugin you have built — what it did, how you structured it, what it solved
• One sentence on your approach to writing code others will need to maintain
• Your available hours during UK business hours
• Whether you have led developers before and briefly in what context

A specific, well-written application will get our attention far faster than a long one. We notice the difference between someone who read the advert and someone who did not.

No agencies. No third-party submissions. Direct applicants only.

Pay: Up to Rs120,000.00 per month

Work Location: Remote