React Front End Developer

Satalia

. Build the Solve shared visual workspace and real-time collaborative canvas .

Posted 9/30/2026contractRemote • United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in Senior Frontend Engineering, particularly with Deep React and real-time event handling. Capable of building complex interactive products while ensuring performance, accessibility, and effective collaboration with backend teams.

Highest-signal resume keywords

Deep React ExpertiseReal-Time Event HandlingFrontend State ManagementCollaborative Software AuthorityPerformance Optimization

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Frontend EngineeringState OwnershipComponent DecompositionEvent OrderingOptimistic ConcurrencyConflict HandlingAPI DesignInteractive Product DevelopmentBrowser PerformanceCoding Agents

Tools & Technologies

WebSocketsServer-Sent EventsMonoreposCIQuality GatesFeature FlagsDesign Systems

Industry Keywords

Collaborative AppCanvasEditorMapDesign ToolWhiteboardReal-Time CollaborationMissed-Event RecoveryTransient InteractionPersistent Product State

Tech Stack

Tools & technologies

React

About the role

Key responsibilities & impact

Build the Solve shared visual workspace and real-time collaborative canvas
Ship frontend code in the canvas and collaboration layer
Work closely with the technical lead, architect, and QA
Implement canvas interactions including pan, zoom, drag, selection, spatial layout, and rich interactive cards
Keep the canvas performant with hundreds of live cards
Manage frontend state across transient interaction, persistent product state, and server-authoritative data
Implement real-time collaboration features including presence, optimistic updates, reconnects, missed-event recovery, and conflict handling
Own client-side Server-Sent Events handling, including EventSource, heartbeats, token-authenticated streams, and backoff reconnects
Help determine where WebSockets should be used
Build AI-facing surfaces for streaming output, agent status, partial results, approvals, and recovery
Ensure performance, accessibility, and testing strategy
Implement the per-entity patch wire over SSE
Add optimistic apply with resync on missed events
Build a pending-edits queue that survives reloads
Resolve data-loss defects across load, save-conflict, and live-update paths
Prototype, simplify, and maintain legible systems with specs, designs, and tests

Requirements

What you’ll need

Senior frontend engineering experience
Deep React (or equivalent) expertise
Strong browser-state expertise
Experience building complex interactive products such as a canvas, editor, map, design tool, whiteboard, or collaborative app
Understanding of state ownership, rendering, browser performance, component decomposition, and failure-prone interactions
Experience with collaborative software authority and conflict rules
Experience shipping real-time event handling over WebSockets or Server-Sent Events
Understanding of event ordering, reconnects, and missed-event recovery on unreliable connections
Familiarity with coding agents and AI-native frontend problems
Ability to design API request and response shapes with backend teams
Understanding of idempotency and optimistic concurrency
Ability to decide which side owns a given piece of state
Technical familiarity with monorepos, CI, quality gates, feature flags, and design systems is useful
Ability to work in the UK
Contract availability for 3 months

Benefits

Comp & perks

Truly flexible working
Wellbeing and inclusivity focus
Safe and inviting work environment
Autonomy and freedom
Warm, inclusive culture
Diverse and challenging projects
Technical skills development through hands-on work
Employees' opinions valued and achievements celebrated