Senior Staff Full Stack Engineer

Overview

Job Description

Responsibilities

• - Drive Technical Leadership through Execution: Alongside Principal Engineers, you will lead and ship high-impact improvements across Rosso workflows, improving correctness, operability and scalability as volume and complexity grow.
• - Drive Multi-Team Initiatives: Lead complex, cross-functional efforts across teams and systems - aligning stakeholders and delivering high-leverage outcomes.
• - Build & Ship: Continue being deeply hands-on in designing, coding, and reviewing critical components across stateful backend services, APIs, and infrastructure.
• - Strengthen Foundations: Improve reliability and operability, observability, testing strategy, and deployment practices - driving monitoring of service objectives, incident reduction, and operational excellence.
• - Integrate machine learning models into production: Partner with ML/Data teams to productionise a range of models (including forecasting, optimisation and pricing) safely and effectively within core Rosso workflows.
• - Design for correctness in complex workflows: Build and evolve pricing and deal-flow workflows where consistency and failure handling are first-class concerns.
• - Prevent domain drift: Create and maintain clear domain boundaries, shared language, and reduce compounding complexity over time.
• - Multiply Impact: Mentor Staff and Senior Engineers, raise engineering standards, and act as a trusted technical advisor to leadership.
• - Plan for Scale: Architect systems to handle high-volume quoting/pricing activity and large customer counts, anticipating bottlenecks before they emerge.

Required Skills

• - Exceptional technical leadership experience: Experience operating at Staff+ or Senior Staff level, with clear evidence of organisation-wide impact at a high-growth startup.
• - Architectural depth: Proven ability to design and evolve complex, stateful distributed systems spanning APIs, event-driven architectures, data systems, and front-end applications - where domain logic is the primary source of complexity.
• - Proven patterns for high-throughput performance and scaling architecture to support hundreds of thousands of customers, while preventing domain drift.
• - Multi-team influence: Experience leading cross-team initiatives that directly impact revenue across engineering, product, data, machine learning, commercial and ops stakeholders.
• - Modern tech expertise: Deep experience with: Python, AWS serverless architecture (Lambda, API Gateway, DynamoDB), Event-driven systems and asynchronous workflows.
• - Data + domain modelling strength: Strong ability in data modelling for complex, interdependent business rules, including correctness, consistency, and designing for failure modes.
• - Product & business alignment: Demonstrated ability to connect technical decisions to business outcomes and customer experience.
• - First-principles problem solving: Ability to reason from fundamentals (constraints, incentives, data and system behaviour) to design solutions in complex, high-stakes domains.
• - Navigating ambiguity: Comfort operating in evolving environments, defining direction where it doesn’t yet exist.

Benefits

• - Competitive salary - our current band for this role is £129,500 or equivalent in local currency. We review salaries twice a year using real-time market data, with transparent, consistent pay for the same role and level.
• - Stock Options - everyone on the team has ownership in our mission.
• - 25 days holiday + public holidays - Swap public holidays for ones that matter most to you. Plus, get an extra day off for your birthday 🎉.
• - Remote & flexible working - We’re fully remote with clear core hours, and no internal meetings on Friday afternoons.
• - Home working & wellbeing budgets: Up to £1,200 / €1,200 annually to upgrade your remote setup (co-working passes, equipment, etc.). Up to £150 / €150 monthly on anything that supports your wellbeing - from therapy to gym memberships to meditation apps.