Presales Engineer in City of London, 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. We’re a global company with teams across markets and disciplines, working closely with leading players in the payments ecosystem. Our culture is built on clear thinking, collaboration, and a strong sense of ownership.

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.

Key Responsibility:

• 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 updating 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.

Requirement:

• Must-Have 5 years in a Solutions Engineer, Pre-Sales Engineer, or Technical Account Executive role in B2B SaaS, 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:

• This is a focused, pre-sale-only role. To be clear about scope: 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.