Senior Software Engineer

Durlston Partners; Greater London; On-site; GBP 180,000 - 220,000; Full time

Job summary

A leading AI start-up based in London is seeking a Senior Software Engineer to join their high-impact engineering team. You will design and build AI agents that outperform human agents on complex customer interactions, collaborating with business leaders across various sectors. Candidates should have at least 2 years of software engineering experience and strong skills in Python and TypeScript. This full-time role offers a competitive salary of up to £200k, plus equity.

Qualifications

• 2+ years' experience in software engineering.
• Strong competence with Python and TypeScript, including asynchronous programming.
• Ability to debug across deep technical stacks: distributed systems, latency, failure modes, data flows.

Responsibilities

• Design and build AI agents that outperform human agents on complex customer interactions.
• Own features from inception to production, including modelling, evaluation, and integration with customer systems.
• Work directly with business leaders across sectors such as finance, healthcare, transport and hospitality.
• Experiment with the latest text and voice models and build scalable, production‑ready pipelines.
• Identify patterns across customers and feed those insights into platform improvements.

Skills

Python

TypeScript

Asynchronous programming

Debugging distributed systems

Education

Top university degree or equivalent

Job description

Senior Software Engineer - AI Start-up - London - In-Office - Up to £200k Base + Equity

We’re supporting a category‑leading AI organisation building next‑generation conversational agents used by major global brands. Their platform powers intelligent, human‑like interactions across chat, email and voice, resolving millions of customer queries in real time and at enterprise scale.

You would join a high‑impact engineering team responsible for deploying production‑grade AI agents that sit at the core of the product. These agents handle complex, multi‑step customer journeys, work alongside human support teams, and directly influence customer experience, retention and revenue.

This environment suits engineers who enjoy working end‑to‑end across the stack, quickly iterating with customers, and tackling deep technical challenges in reasoning, evaluation, orchestration and large‑scale system reliability.

Responsibilities

• Design and build AI agents that outperform human agents on complex customer interactions.
• Own features from inception to production, including modelling, evaluation, and integration with customer systems.
• Work directly with business leaders across sectors such as finance, healthcare, transport and hospitality.
• Experiment with the latest text and voice models and build scalable, production‑ready pipelines.
• Identify patterns across customers and feed those insights into platform improvements.

Qualifications

• 2+ years’ experience in software engineering.
• Strong competence with Python and TypeScript, including asynchronous programming.
• Ability to debug across deep technical stacks: distributed systems, latency, failure modes, data flows.
• A strong academic background (top university or equivalent).
• Curiosity, ownership, and a bias for rapid, high‑quality execution in an in‑office environment.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Information Technology

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