lago - Solutions Engineer
Requirements
• A strong technical generalist who can read API documentation, write a curl command, debug a webhook, and explain the result to a VP of Finance in the same afternoon • A natural deal-shaper — you understand commercial dynamics and help AEs close by removing technical blockers, not by just answering questions • Someone who writes thorough, clear post-call debriefs without being asked: every prospect interaction generates signal for the team • Comfortable with ambiguity: you don't have a perfect answer for every gap, but you're good at finding one that keeps the deal alive and serves the customer well • Genuinely curious about how billing and pricing systems work — the nuances of metering, aggregation, invoice generation, and revenue recognition interest you • Proactive about internal tooling and process: if you can script or automate something that saves the team time, you do it • You're not someone who reads from a slide deck and escalates anything technical to engineering • You're not indifferent to whether a deal closes or a customer goes live — you feel ownership over both outcomes • You're not a siloed individual contributor — you share context freely, write things down, and loop in the right people early • You're not passive in post-sales: a customer who's stuck is a customer who churns, and you move quickly to prevent that • 5+ years in a Solutions Engineering, Sales Engineering, or technical pre-sales role — ideally in a developer tools, API-first, or infrastructure SaaS company • Strong technical foundation: comfortable with REST APIs, JSON, SQL, and working through integration architectures • Demonstrated experience running complex evaluations and POCs with enterprise or mid-market prospects • Excellent written and verbal communication skills; fluent in English (French is a significant plus for European accounts) • Track record of collaborating closely with AEs and founders in a fast-moving sales environment • Ability to manage multiple active deals and customer implementations simultaneously without dropping the ball • Experience with billing, usage-based pricing, fintech, or revenue infrastructure • Familiarity with scripting (Python, bash, JS) for demo environment setup or automation • Background in post-sales implementation or customer success engineering • Exposure to open-source products or developer communities • Experience presenting to both engineering and finance/executive audiences • Written, async-friendly culture • Direct access to Product and Engineering teams • Transparent, user-driven roadmap • Autonomy and ownership from Day 1
Responsibilities
• Pre-sales (primary focus) • Run technical discovery calls to understand prospects' pricing models, billing infrastructure, and integration requirements • Lead and own product demos — building bespoke demo environments tailored to each prospect's use cases, not off-the-shelf scripts • Manage technical evaluations and cloud trials end-to-end: configure demo data, set up trial environments, run technical workshops, and stay close to the prospect throughout • Write clear, honest deal debriefs that capture what landed, what's at risk, and what actions are needed — shared with the AE and founder team • Surface and work through product gaps creatively: propose API-level workarounds, validate feasibility with engineering, and frame limitations transparently without losing deals • Produce competitive technical analysis and maintain battle cards as Lago's market position evolves • Partner with AEs on commercial strategy: know when to push for a close, when to escalate to a founder, and how to sequence the conversation • Lead onboarding for new customers — both their engineering teams (API integration, event schema, webhooks) and their finance and ops teams (plan configuration, invoice flows, reporting) • Serve as the primary technical point of contact through the implementation phase, owning the customer relationship until they go live • Conduct proactive check-ins and syncs throughout implementation to unblock customers and prevent issues before they escalate • Identify expansion and optimisation opportunities within existing accounts as usage matures • Partner with Customer Success and Support to ensure a clean handoff after go-live • Feed recurring implementation pain points back to Product and Engineering to inform roadmap prioritisation
Benefits
• Work with top-tier talent: Join a team that values excellence, ambition, and accountability • Shape the future of fintech: Be part of a fast-growing company building the best open-source billing platform • Remote-first in Europe: Work from anywhere in Europe • Competitive package: Competitive salary and stock options • Make an impact: Your work will directly influence deals and customers at companies like PayPal, CoreWeave, Synthesia, and Mistral.ai http://Mistral.ai • Ready to Build with Us? • If you're excited about joining a high-talent team to solve meaningful problems and help businesses thrive, we'd love to hear from you. Apply today and let's build something remarkable—together. • Location type: Remote • Primary Location: Remote Europe • Work Type: Full Time/Permanent Contract • (Applicants must be based in Europe. Applications from other locations will not be considered.)
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