Site Reliability Engineer, Gizmo

Salary not provided

+ Equity

Kubernetes

Redis

Postgres

MySQL

Prometheus

Grafana

Senior and Expert level

London

More information about location

4+ days a week in office

Educational software utilising AI

Be an early applicant

Educational software utilising AI

1-20 employees

B2CArtificial IntelligenceEducationGamingLearningSaaS

Be an early applicant

Salary not provided

+ Equity

Kubernetes

Redis

Postgres

MySQL

Prometheus

Grafana

Senior and Expert level

London

More information about location

4+ days a week in office

1-20 employees

B2CArtificial IntelligenceEducationGamingLearningSaaS

Company mission

To help students remember everything they learn in a simple and fun way.

Job

Company

Role

Who you are

Hands-on scale experience: you have run relational stores at 100 k+ TPS or 1 M+ concurrent users (e.g., multi-tenant PostgreSQL, sharded MySQL)
Strong backend fundamentals around concurrency, caching, indexing and distributed systems trade-offs
Proven track record of setting SLOs, building dashboards (Prometheus/Grafana, OpenTelemetry, etc.) and tuning alerts
Comfort with Kubernetes, IaC and cloud-native patterns; can debug from network to application layer
Start-up bias for action: you prioritise high-leverage fixes, ship iteratively and own outcomes end-to-end
Collaborative and feedback-driven; you welcome post-mortem culture and continuous improvement
Driven by impact - you prioritise work that moves the needle!
Nice-to-haves: experience with Hasura internals, Cloudflare Workers edge optimisation, or operating OpenSearch at scale

What the job involves

Reporting to the CTO, you will own capacity, performance and reliability for Gizmo’s full-stack platform as daily traffic climbs from hundreds of thousands to millions of users
You’ll write code across the stack, but your charter is classic SRE: defend SLOs, eliminate toil, and raise the ceiling on scale before it becomes a hard limit
Define SLIs/SLOs for latency, availability and error rate; codify error budgets and partner with product teams on trade-offs
Perform load-testing, capacity modelling and up-front scalability design for PostgreSQL, OpenSearch, Redis, Hasura and CF Workers; produce data-driven scaling plans
Extend metrics, structured logging and tracing; establish alert rules that page only on user-visible impact; build actionable runbooks
Join the on-call rotation, lead blameless post-mortems, drive remediation work to closure and track MTTR/MTBF improvements
Automate repetitive ops on Kubernetes and CI/CD; keep “toil” <50 % of your time by pushing fixes into code
Coach full-stack engineers on query optimisation, schema design and back-pressure techniques; document patterns and anti-patterns by creating an SRE playbook

Salary benchmarks

Our take

Gizmo is an ambitious startup dedicated to revolutionising learning through innovative technology. Drawing inspiration from successful platforms like Duolingo, Gizmo applies gamification and AI to create engaging quizzes that enhance retention based on cognitive science principles.

By simplifying the learning process into short daily quizzes, Gizmo aims to help users remember everything they study, making education not only effective but fun. Already the platform has been enthusiastically adopted by teachers and students worldwide, positioning Gizmo for continued growth.

Freddie

Company Specialist at Welcome to the Jungle

Company

Funding (1 round)

Sep 2023

$3.5m

SEED

Total funding: $3.5m

Company benefits

Meaningful equity

Company HQ

Old Street, London

Leadership

Petros Christodoulou

(Co-Founder & CEO)

Previously a Machine Learning Scientist at Amazon. Also worked as a YouTube Marketer at Google and as an Analyst at Zopa and Europe Economics.

Paul Evangelou

(Co-Founder)

Began their career as a History Teacher at Teach First. They also worked as a Senior Associate at PwC, a Senior Consultant at ReD Associates and a Senior Product Manager at Touch Surgery.

Robin Jack

(Co-Founder)

Previously a Senior Product Manager at Skimlinks and a Research Analyst at QuBit Group.

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