Build and maintain production Golang backend services and data pipelines for an AI-driven investment platform. Design APIs, improve performance, reliability, and observability, debug production issues, and collaborate with AI and product teams to ship scalable, low-latency systems.
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.
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.
- 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
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.
- 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
- Experience supporting ML or LLM systems
- Distributed systems or low-latency data pipelines
- Engineers own systems end to end
- Clear accountability and direct feedback
- In-office team with high trust and high ownership
- Work on systems that directly affect investor outcomes
- Strong technical ownership
- High bar engineering culture without bureaucracy
- £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
Toggle AI London, England Office
8-12 Broadwick St, London, United Kingdom, W1F 8HN
Similar Jobs
Blockchain • eCommerce • Fintech • Payments • Software • Financial Services • Cryptocurrency
Own the full outbound B2B sales cycle for SMB and mid-market merchants, from prospecting and pipeline development through multi-product discovery, negotiation, and close. Build net-new business through cold outreach and strategic campaigns, manage complex multi-stakeholder deals, maintain accurate Salesforce forecasts, collaborate cross-functionally, and consistently achieve revenue targets.
Top Skills:
Salesforce
Blockchain • eCommerce • Fintech • Payments • Software • Financial Services • Cryptocurrency
Own the full outbound sales cycle for SMB and mid-market merchants, from prospecting through negotiation and close. Build pipeline through cold outreach and targeted campaigns, develop tailored multi-product solutions, conduct discovery and demos, manage complex deals, forecast accurately in Salesforce, and consistently exceed revenue targets. The role requires consultative B2B selling, net-new business development, strong negotiation skills, and experience with SaaS or fintech sales.
Top Skills:
Salesforce
Cloud • Computer Vision • Information Technology • Sales • Security • Cybersecurity
Provide incident handling, malware analysis, forensic investigation, remediation, detection engineering, and security automation across Windows, macOS, and Linux environments. Configure and optimize CrowdStrike Falcon modules, develop security content and automations, advise customers during incidents, produce technical findings, and support platform onboarding. The role also involves customer communication, thought leadership, operational improvement, and mentoring.
Top Skills:
.NetAi TechnologiesCC#Crowdstrike FalconDlpEdrFirewallsLinuxmacOSPerlPowershellPythonRuby On RailsSIEMVisual BasicWindows
What you need to know about the London Tech Scene
London isn't just a hub for established businesses; it's also a nursery for innovation. Boasting one of the most recognized fintech ecosystems in Europe, attracting billions in investments each year, London's success has made it a go-to destination for startups looking to make their mark. Top U.K. companies like Hoptin, Moneybox and Marshmallow have already made the city their base — yet fintech is just the beginning. From healthtech to renewable energy to cybersecurity and beyond, the city's startups are breaking new ground across a range of industries.
