Senior Staff Engineer - Transaction Platform

Overview

Job Description

Responsibilities

• - Own and ship complex deliveries.
• - Lead high-impact improvements across Rosso's pricing and deal-flow workflows — improving correctness, operability, and scalability as volume and complexity grow.
• - Make architectural decisions that stick.
• - Design and evolve a stateful, event-driven system where domain logic is the primary source of complexity.
• - Create clear domain boundaries and prevent the kind of drift that compounds over time.
• - Partner with ML and Data Science.
• - Work closely with our ML and Data Science teams on integrating forecasting, optimisation, and pricing models into Rosso's core workflows.
• - Lead across teams.
• - Drive cross-functional initiatives spanning engineering, product, data, and commercial stakeholders.
• - Raise the bar.
• - Mentor Staff and Senior Engineers, strengthen observability and testing practices, and act as a trusted technical voice to engineering leadership.
• - Plan for scale.

Required Skills

• - You operate at Staff+ level with a track record of organisation-wide impact.
• - You've owned major technical initiatives at a high-growth startup and can point to what changed because of it.
• - You have deep application architecture experience in complex domains.
• - You've designed and evolved stateful distributed systems — APIs, event-driven architectures, data systems — where business logic is the hard part.
• - You're comfortable working in Python.
• - You're strong with AWS serverless architecture.
• - You can drive to a concrete decision under ambiguity.
• - You connect technical decisions to business outcomes.
• - You lead cross-team work.

Benefits

• - Competitive salary - 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.