Senior Full-Stack Developer — Lead Generation

About the Company

Granton Hale Capital is part of a financial services group with operations across investment banking, business lending, and large-scale technology infrastructure. We operate across multiple countries and are building internal tools to support our growth.

We move fast, value execution over process, and hire people who can own their work end-to-end.

About the Role

We need one developer to build our entire internal tool stack. You will be the sole developer building a platform that powers real business operations at serious scale — millions of emails, millions of contacts, hundreds of thousands of accounts. Full autonomy: you get specs, you build, you ship. There's a backlog of 10+ projects and years of continuous work for the right person.

What You'll Build

• Email verification engine — MX lookup, SMTP handshake, catch-all detection, proxy rotation, anti-detection, built to verify millions of addresses
• Google Maps scraper — large-scale structured extraction (business name, address, phone, email, category, reviews) with anti-detection
• Cold email sequencing platform — managing sends across hundreds of thousands of connected email accounts (Outlook/Google APIs), 1M+ daily volume, random scheduling for deliverability, IMAP reply detection, webhook integrations, campaign management dashboard
• Self-hosted SMTP Inboxes
• LinkedIn open profile scraper — bulk extraction of public profile data
• LinkedIn automation tool — connection requests, messaging sequences, profile visits at scale
• Apollo scraper — contact and company data extraction at volume
• Internal enrichment and workflow engine — webhook in, verify, enrich, personalise with AI, push to sending infrastructure
• Contact database platform — millions of records, searchable, deduplicated, with API access
• Unified API layer — connecting all internal tools into one system

Qualifications

Someone who solves problems, not someone who reports them. If an IP gets blocked, implement rotation and move on. If a scraper breaks, fix it before it's noticed.

• Strong Node.js and/or Python
• PostgreSQL at scale (millions of rows, proper indexing)
• Redis + job queues (BullMQ, Celery, or similar)
• Puppeteer / Playwright — headless browser automation, anti-detection, proxy management
• REST API development
• Next.js / React for dashboards
• SMTP / IMAP protocol knowledge, DNS (SPF/DKIM/DMARC)
• Comfortable deploying on Linux / VPS
• Uses AI coding tools daily (Claude Code, Cursor, Copilot)

Nice To Have

• Built email verification or deliverability systems before
• LinkedIn scraping / automation experience
• High-throughput architecture (horizontal scaling, worker pools)

Benefits

• $750 – $1,250 USD/month depending on experience and output, paid monthly
• Claude Pro and Cursor Pro provided
• Continuous work — this isn't a 3-month contract; the backlog is deep and growing
• Full autonomy — no standups, no sprint ceremonies, no Jira tickets
• Fast feedback and performance-based raises