PreSales Engineer - UK in London

Justt helps many of the world’s largest and most recognizable brands turn chargebacks from a constant headache into a managed, predictable part of doing business.

Our AI-driven platform powers chargeback operations at scale, automating disputes end to end, recovering revenue that would otherwise be lost, and removing a major operational burden from finance, risk, and operations teams across multiple regions and verticals.

Our culture is built on clear thinking, collaboration, and a strong sense of ownership.

At Justt, you’ll partner with product, engineering, data, success and go-to-market teams to build technology that sits at the core of modern payments, and has a direct, measurable impact on the bottom line for some of the biggest companies in the marketplace.

Role Overview

The Pre‑Sale Solution Engineer is Justt's technical co‑pilot in the sales process: present from the first meaningful discovery call and fully accountable for all technical workstreams until the contract is signed.

This is a pure pre‑sale role: you do not own onboarding or post‑launch support.

Your focus is singular: help Sales win technically complex, high‑value deals.

You will work closely with Account Executives across the AMER region, engaging on strategic accounts and deals above the defined threshold ($30K+ CARR/ARR).

You bring equal measures of technical depth and commercial instinct: you know how to run a rigorous scoping session and how to read a room.

This role sits within the Commercial Operations department and reports to the Director of Solutions.

• Technical Discovery & Scoping
• Lead technical discovery on qualified prospects: understand their payment stack, PSP(s), data architecture, chargeback volume, and existing dispute processes.
• Define and scope the integration approach: API connectivity, PSP evidence retrieval, data enrichment options, and any custom requirements.
• Identify gaps, risks, and blockers early and surface them clearly to Sales and internal stakeholders.
• Act as the internal relay between Sales and Product/Engineering when non‑standard requirements surface during the sales cycle.
• Demo & Proof of Concept
• Deliver compelling, tailored technical demonstrations and adapt to the prospect's actual environment, stack, and use case.
• Build and run proof‑of‑concept (POC) sessions that prove Justt's fit technically and commercially.
• Handle technical objections confidently and independently turning blockers into reasons to move forward.
• Statement of Work (SOW)
• Translate scoping outputs into a precise, commercially sound SOW: integration approach, timelines, data requirements, and acceptance criteria.
• Own the SOW as a living document through the sales cycle and update it as requirements evolve.
• Hand off a clean, complete SOW to the onboarding SE team at contract signature.
• Sales Partnership
• Operate as a true partner to the Account Executive, not a support function. You co‑own deal progression on the technical track.
• Know when to go deep and when to keep it simple. Prospects should leave every call feeling confident, not confused.
• Represent Justt's technical credibility across the US market: in enterprise and fintech environments where the bar is high.
• Maintain a clean Jira board for all active pre‑sale engagements; flag capacity and prioritization issues early.

Requirements

• Must‑Have
• 5+ years in a Solutions Engineer, Pre‑Sales Engineer, or Technical Account Executive role in B2B Saa S, fintech, or payments.
• Demonstrated track record selling to or supporting enterprise and mid‑market clients in a technical capacity.
• Hands‑on experience with REST APIs: reading documentation, testing endpoints, debugging payloads independently.
• Experience working directly with PSPs or payment gateways (e. g., Stripe, Adyen, Braintree, Checkout. com).
• Native or near‑native English as you will lead technical conversations with senior stakeholders at enterprise prospects.
• Strong commercial instinct: you understand that your technical work is in service of winning the deal.
• Ability to simplify complex technical concepts for non‑technical audiences such as merchants, finance teams, legal, C‑suite.
• Strong Advantage
• Background in the chargeback, dispute management, or payments fraud domain — you already speak the language.
• Experience in fintech or payments infrastructure companies (acquirers, PSPs, gateways, fraud/risk platforms).
• Experience authoring Statements of Work or complex technical scoping documents.
• Exposure to data enrichment pipelines or event‑driven data flows.
• Experience selling into US enterprise retail, travel, or marketplace verticals.
• What This Role Is Not
• You do not own onboarding or implementation as that transitions to the onboarding SE at contract signature.
• You do not provide post‑launch technical support as that is the domain of the full‑cycle SE team.
• You are not a demo operator or slide deck builder. You are a technical partner who co‑owns deal progression.
• You are not pulled into every discovery call. You engage on qualified deals above the defined threshold.
• Cross‑Functional Interfaces
• Account Executives (AEs): primary partner; you co‑own the technical track of every deal you join.
• Director of Solutions: your manager; owns your capacity, prioritization, and development.
• Onboarding SE team: your handoff recipients; a clean SOW and complete discovery is your primary output to them.
• Product & Engineering: relay for non‑standard requirements and feasibility questions that arise during scoping.
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