Software Engineer

MBN Solutions; Greater London; On-site; GBP 180,000 - 250,000; Full time

Benefits offered by this job

Competitive salary

Equity

Job summary

MBN Solutions is seeking a Founding Software Engineer for AI voice agents, based in London with office presence. You will own platform features across the stack (Python/TypeScript), shape product direction, and work directly with customers to deliver impactful AI-enabled solutions.

This role offers founding-level ownership, equity, and the chance to influence product and culture as the team scales in a high-growth environment.

Qualifications

• Strong software engineering fundamentals with ability to design, debug and ship reliable systems.
• Proficient in Python or TypeScript (or demonstrated ability to pick up required skills).
• Experience shipping AI products end-to-end, ideally in startups or scale environments.
• Comfortable across frontend, backend and infra with broad problem ownership.
• Ability to scope with customers or non-technical stakeholders and deliver.

Responsibilities

• Build core product features across the stack using Python, TypeScript and cloud infra.
• Own solutions end-to-end by working directly with customers to understand needs and deliver outcomes.
• Balance speed and scalability by MVP hacking and establishing scalable foundations when needed.
• Promote quality through testing, documentation, reliability and security practices.

Skills

Python

TypeScript

End-to-end AI

System design

Customer collaboration

Tools

Kubernetes

Serverless

Distributed systems

Job description

Founding Software Engineer – AI Voice Agents – London office based – upto £250k

Ever built something from zero and watched it become the backbone of a company?

Love owning a problem end to end - from customer conversation to shipped code?

Want to work with cutting-edge AI in a business that\'s actually scaling, not just theorising?

If that sounds like you, keep reading.

The Challenge

This is a Series A startup (fresh off a $13m raise, YC-backed) building AI voice agents for trades businesses - agents that answer calls, handle WhatsApp and email, take bookings, process payments, and run the CRM the way a human would.

Revenue\'s growing ~30% month on month. They\'ve gone from founders living and breathing AI in San Francisco to a business shipping fast and scaling hard. Now they need a founding engineer to help build the next chapter.

This isn't a \"nice to have\" hire. You\'ll shape how the product works, how the team operates, and how the company grows.

What You\'ll Be Building

• Core product features across the stack - Python, TypeScript, cloud infra, event-driven systems, third-party integrations
• Solutions owned end to end - working directly with customers to understand needs, scope the build, and deliver outcomes
• The right thing at the right speed - hacking an MVP when speed wins, investing in scalable foundations when it counts
• A team that raises its own bar - testing, documentation, reliability, security, done properly and shared with others

Why This Role Is Different

• Founding-level ownership from day one, not just a seat on the team
• A business moving fast with the funding to back it
• Genuine influence over the product and the culture as the team scales

About You

• Strong software engineering fundamentals - you can design, debug, and ship reliable systems
• Proficient in Python or TypeScript (or clear proof you can pick up what\'s needed)
• Experience shipping AI products end-to-end - startup, side project, open source, or at scale
• Comfortable across the stack - frontend, backend, infra, wherever the problem is
• Confident working directly with customers or non-technical stakeholders to scope and deliver
• A track record that shows drive - something you\'ve launched, contributed to, or taken ownership of when nobody else would

Bonus if you have:

• Early-stage startup experience, especially in AI, voice platforms, or event-driven systems
• Familiarity with modern cloud infra - Kubernetes, serverless, distributed systems
• Evidence of customer empathy - support, founder, or just building things that solved real pain

What\'s on Offer

• Competitive salary & equity
• AI-focused learning & development
• Team socials & annual offsites (last year: Greece)