---
title: 'Backend Software Engineer, Golang - London at Reflexivity'
canonical: 'https://feeny.ai/job/backend-software-engineer-golang-london-reflexivity-london-nbqgtvx07qt9'
type: 'job'
last_seen: '2026-09-08'
---

# Backend Software Engineer, Golang - London at Reflexivity

- **Company:** Reflexivity
- **Location:** London, United Kingdom
- **Compensation:** £80k–£160k
- **Posted:** 2026-01-08
- **Last confirmed live:** 2026-09-08
- **Apply:** https://reflexivity.firststage.co/jobs?gh_jid=5018779007

## Job description

You build backend systems that stay up when things get ugly. You care about correctness, performance, and clarity over cleverness. You want your code to power decisions involving real money. If you have only worked on internal tools or low-impact services, this is not the role.

## The Role, In Plain English

You will build the backend systems that power Reflexivity’s AI-driven investment platform. This role exists because scale, data complexity, and latency matter deeply in finance. You will work closely with AI and product teams to ship production-grade systems.

## What You’ll Be Responsible For

- Build and maintain Golang services that power core product workflows
- Design APIs and data pipelines used by AI and reasoning systems
- Improve system performance, reliability, and observability
- Review and challenge designs to keep systems simple and scalable
- Debug production issues with speed and discipline

What “Good” Looks Like in This Role

After 3 months: You ship production code confidently and understand system trade-offs.

After 6 months: You own critical services and improve their performance or reliability.

After 12 months: You influence architecture decisions and mentor other engineers.

## Who You Are (Must-Haves)

- 5 plus years backend engineering experience
- Strong Golang experience in production systems
- Startup experience on a core product
- Experience working with data-heavy systems
- Comfortable using AI-assisted coding tools daily
- Fintech or investment domain exposure

Nice-to-Haves

- Experience supporting ML or LLM systems
- Distributed systems or low-latency data pipelines

## How We Work

- Engineers own systems end to end
- Clear accountability and direct feedback
- In-office team with high trust and high ownership

## Why This Role Is Worth Your Time

- Work on systems that directly affect investor outcomes
- Strong technical ownership
- High bar engineering culture without bureaucracy

## Compensation & Practicalities

- £80,000 to £160,000 depending on experience
- Equity included
- In-office role based in London
- No agencies

Salary Range £80,000—£160,000 GBP

## About Reflexivity

## Company Overview
- **One-liner**: Reflexivity is an AI-powered investment analysis platform that provides institutional investors with explainable financial insights through a connected market intelligence knowledge graph.
- **Entity Type**: Private (Series B)
- **Headquarters**: New York, New York, United States
- **Founded**: 2019
- **Founders**: Jan Szilagyi (CEO) and Armenak Mayalian (CTO)

## Core Business
- **Primary industry**: Fintech / Financial Services — AI-powered investment analysis
- **Target customers**: Institutional investors (asset managers, hedge funds, portfolio managers, banks)
- **Mission / Purpose**: To build the market analysis platform that portfolio managers wish they had — delivering faster insights, better analysis, and greater confidence through explainable AI.

## Products & Services
- **Deep Research**: An

## Other roles at Reflexivity

- [Product Manager, Data, London](https://feeny.ai/job/product-manager-data-london-reflexivity-london-t84t8zs1p1z4) — London, United Kingdom
- [Product Manager, Data, New York](https://feeny.ai/job/product-manager-data-new-york-reflexivity-new-york-new-york-hqn4z3gjnsjj) — New York New York, United States
- [Machine Learning and Quant Engineer - London](https://feeny.ai/job/machine-learning-and-quant-engineer-london-reflexivity-london-hgdaz4dq0hyr) — London, United Kingdom
- [Machine Learning and AI Engineer - London](https://feeny.ai/job/machine-learning-and-ai-engineer-london-reflexivity-london-jv9v2kp4827n) — London, United Kingdom
- [Machine Learning and AI Engineer - New York](https://feeny.ai/job/machine-learning-and-ai-engineer-new-york-reflexivity-new-york-c38abfzh7hds) — New York, NY