# Senior Backend Engineer - London

[Junior](https://gurify.com/jobs?q=Junior) · London · Posted 8 months ago

Senior

[Backend](https://gurify.com/jobs/backend)

[AI & ML](https://gurify.com/jobs/ai-ml)

[Apply on the original posting → (opens in a new tab)](https://jobs.ashbyhq.com/junior/52a74883-a538-4621-b573-a8cf6467781f)

## Job description

### ABOUT JUNIOR

We’re building cutting-edge LLM-powered workflow tools to supercharge investment research for private market investors. Our clients include most of the global top 10 private equity and consulting firms - Junior already powers hundreds of billions of dollars invested annually. We’re a profitable, bootstrapped company with a growing team of 40+ based in London, NYC and Sydney. We 10x’d our revenue in 2025.

You can read more about the company mission & values here https://myjunior.notion.site/join-junior-2026?source=copy_link.

### ROLE DESCRIPTION

You’ll build and scale the systems that power our AI-driven research products and enable our operations / sales teams to deliver our product as efficiently as possible. This is a systems-level role - ideal for engineers who love thinking about data flows, orchestration, and performance across complex distributed systems.

### You’ll have the opportunity to:

- Ship quickly

- Architect and scale backend systems that support high-throughput LLM interactions, vector search, and multi-agent orchestration.

- Stitch together AI infrastructure across model providers, data stores, and internal APIs to create cohesive, performant systems.

- Prototype new backend capabilities (retrieval pipelines, caching layers, async task queues) that let us build faster and smarter

- Own the architecture of internal data systems and pipelines

- Build automation and integrations across product, CRM, and financial systems

- Help shape engineering culture and internal infrastructure decisions

### ABOUT YOU

We’re looking for a Backend Engineer who enjoys building systems that make a company run better.

### You might be a good fit if you:

- Are based in London and excited to work from our Farringdon office (5 days/week)

- Have experience owning technical projects end-to-end, from architecture through production

- Are excited by the intersection of AI infrastructure, financial systems, and backend engineering

- Enjoy translating business problems into clean technical systems and automation

- Have worked with PostgreSQL and care about data modelling, reliability, and system design

- Write production code in Python, or TypeScript

- Are comfortable building APIs, internal tools, workflows, and infrastructure that support real customers

- Thrive in fast-moving startup environments and enjoy shipping quickly while maintaining strong engineering standards

### Bonus points for experience working on:

- Billing, payments, usage-based pricing, or financial workflows

- Internal infrastructure / dev tools at startups

- Data pipelines, workflow orchestration, or event-driven systems

- Retrieval, embeddings, or prompt orchestration

### Why Junior

- Top 1% traction: 0-20+ m rev in 3 years, fully bootstrapped / profitable, top-tier customers inc. some of MBB, Big 4, Top 5 PE mega-funds

- Flat org structure: lean startup environment – every engineer reports directly to the CTO / co-founder

- Competitive salary + equity and first-class benefits inc:

 - Team lunch provided everyday at the London HQ!

 - Third Space membership

 - Private health insurance

 - Multiple all-expense paid offsites per year (last 3 trips include Crete, Greece; Cancun, Mexico; Barcelona, Spain)

 - Visa sponsorship available

**Live in Junior’s hiring system.** Read from the company's own applicant tracking system, not reposted from a job board — so it's a real, open requisition rather than an ad that outlived the role.

We remove it as soon as it disappears at source.

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