Fullstack Engineer, Investigator Tools

Sardine

. Bridge complex technical backend systems and user-friendly interfaces to help stop fraud .

Posted 10/14/2026full-timeRemote • United KingdomMid-LevelSenior💰 €112,000 - €128,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in backend and frontend development, particularly in building data-intensive applications and optimizing graph systems for fraud detection. Proven ability to translate complex technical systems into user-friendly interfaces while collaborating effectively across teams.

Highest-signal resume keywords

TypeScript DevelopmentNode.js ProgrammingReact Application DevelopmentData ModelingProduction Data Pipeline Development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentFrontend DevelopmentEfficient Code WritingData-Intensive ApplicationsGraph Systems OptimizationSearch Tool DevelopmentBug Diagnosis and ResolutionTechnical Modeling

Soft Skills

OwnershipProblem-SolvingCollaborationAdaptability

Industry Keywords

Fraud DetectionBig DataHigh-Growth Startup EnvironmentUser Experience (UX)

Tech Stack

Tools & technologies

JavaScriptNode.jsReactTypeScriptGo

About the role

Key responsibilities & impact

Bridge complex technical backend systems and user-friendly interfaces to help stop fraud
Work approximately 60% on backend development and 40% on frontend development
Build data-intensive applications, including advanced graph systems used to uncover complex fraud rings
Own features end-to-end, from defining the problem space and user needs through technical modeling, UX execution, and iterative improvements
Translate complex technical systems into intuitive, user-friendly interfaces
Develop and optimize graph systems to visualize fraud rings
Build performant search tools to help analysts identify suspicious transactions
Collaborate with Design, Data, Product, and Account Management teams
Diagnose, triage, and resolve bugs while writing efficient, performant code

Requirements

What you’ll need

Extensive experience writing efficient, production-ready code in TypeScript, Node.js, React, Go and other server programming languages
Proven experience working with data-intensive applications, complex workflows, and big data at scale
Deep background in technical data modeling and building robust production data pipelines
Ability to thrive, execute, and deliver consistently in a fast-paced, high-growth startup environment
Proven track record of taking extreme ownership of ambiguous problems and independently turning them into polished, scalable features
Must keep a home base in the country hired in
Must currently reside in the hiring location

Benefits

Comp & perks

Generous compensation in cash and equity
Early exercise for all options, including pre-vested
Work from anywhere: Remote-first Culture
Flexible paid time off and Year-end break
Health insurance, dental, and vision coverage for employees and dependents - US and Canada specific
4% matching in 401k / RRSP - US and Canada specific
MacBook Pro delivered to your door
One-time stipend to set up a home office — desk, chair, screen, etc.
Monthly meal stipend
Monthly social meet-up stipend
Annual health and wellness stipend
Annual Learning stipend