Principal Software Engineer

Alto

. Lead Alto's migration to its next-generation platform, designed for people and AI agents .

Posted 11/7/2026full-timeLondon • United KingdomLead💰 £120,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in leading platform migrations, particularly in .NET and TypeScript, while ensuring data safety and compliance. Capable of guiding teams through technical decisions and fostering clear communication of design and strategy.

Highest-signal resume keywords

Platform Migration LeadershipEnd-To-End Workflow DevelopmentAI-Agent Capability DesignData Ownership ImplementationTechnical Strategy Influence

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

.NETTypeScriptReact Micro-FrontendsAWSDatabase ServicesTechnical Debt ManagementAI-Agent CapabilitiesData ProtectionAudit TrailsDesign Reviews

Soft Skills

Clear CommunicationTeam GuidanceConfidence in Prototyping

Industry Keywords

Platform ArchitectureSystem BoundariesEngineering StandardsData SeparationHuman Approvals

Tech Stack

Tools & technologies

AWSReactTypeScript.NET

About the role

Key responsibilities & impact

Lead Alto's migration to its next-generation platform, designed for people and AI agents
Own target architecture, key design decisions, system boundaries, and engineering standards
Build platform foundations and move real features onto the new platform
Extract core business capabilities from the existing monolith into .NET
Build end-to-end Jobs of Work workflows in TypeScript with React micro-frontends on AWS
Move key production data to modern database services while maintaining data separation and safety
Design AI-agent capabilities with permissions, safe retries, audit trails, and human approvals
Guide teams through design reviews, technical decisions, and pairing
Own design, implementation, rollout to real customers, and recovery plans
Develop proofs of concept and challenge the existing direction
Enable a second team to migrate independently using the established platform blueprint
Improve platform performance and scale
Help engineers across Alto understand how the platform works and why

Requirements

What you’ll need

Experience moving a live system, with old and new systems running side by side for real customers
Understanding of technical debt in long-lived codebases and business logic embedded in data layers
Experience or interest in building safe AI-agent capabilities for real business systems
Ability to define data ownership boundaries and implement them in code
Ability to set technical strategy and influence teams through written decisions, design reviews, and pairing
Confidence sharing proofs of concept and using early feedback
Clear communication of technical designs, trade-offs, and business updates
Experience with .NET and TypeScript
Experience with React micro-frontends
Experience with AWS
Experience moving production data to modern database services while live
Understanding of permissions, retry-safe actions, audit trails, data protection, and human sign-off for money or legal actions

Benefits

Comp & perks

Everyday Flex - greater flexibility over where and when you work
25 days annual leave + extra days for years of service
Day off for volunteering & Digital detox day
Festive Closure - business closed for period between Christmas and New Year
Cycle to work and electric car schemes
Free Calm App membership
Enhanced Parental leave
Fertility Treatment Financial Support
Group Income Protection and private medical insurance
Gym on-site in London
7.5% pension contribution by the company
Discretionary annual bonus up to 10% of base salary
Talent referral bonus up to £5K