Senior Software Engineer

Senior Software Engineer (Backend Focus) | AI-Native Vertical SaaS | Seed Stage | London£120-140K + Equity | 3 days in Victoria | Backed by top-tier European VCsYou've been at your current company three or four years. The early stuff was real, the platform work mattered. But the company has grown past that stage and most of what you do now is feature work inside a codebase whose foundational decisions got made before you arrived.What you want next is real architectural ownership at a stage where your decisions compound. Working on a product you believe in, led by founders you can trust to execute. This is that company.The role: own the platform foundations of a seed-stage AI-native UK law firm from MVP through public launch in August and the M&A roadmap that follows. State machine, workflow engine, API layer, security, data model. Working directly with the CTO. The AI agent infrastructure is already built, you'd own the platform underneath it.Why it matters: every year 530,000 UK property transactions fall through, mostly because conveyancing hasn't been seriously rebuilt for technology. £2M raised to fix that, automating 80% of work that currently consumes qualified professionals' days. In an M&A strategy the platform compounds, every acquisition cheaper to integrate than the last.Why it'll work: founders built one of the UK's most recognised consumer brands to £20M+ revenue and global retail distribution before this. Backed by investors behind Moneybox, Exotec and Thought Machine. Supported by the ex-Chairman of the UK Conveyancing Association and legaltech VCs. Internal security, compliance and legal expertise already in place. The platform engineer is the missing piece.Who you are:5+ years building production software, backend emphasisStrong skills across their stack - Python, AWS, Typescript, React/Next.jsYou've made architectural calls on platforms where reliability and security weren't optionalAI tools daily in your workflow, with your own views on how engineering practice should evolveLove the early-stage startup world, where you can take ownership and make serious impact£120-140K base + equity. London Victoria, 3 days in office. Full UK work rights required.Apply or email me: reuben@techmunity.io