Senior/Staff Fullstack Software Engineer

Location: Fitzrovia, London (Hybrid – 4 days in office, 1 day remote)

About the Company: Wizeline is a global AI-native technology solutions provider that develops cutting‑edge AI‑powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a global community of innovators, we foster a culture of growth, collaboration and impact.

Role Summary: We are looking for a Senior or Staff Fullstack Software Engineer to work with one of our most important clients in London. In this role you will build scalable, high‑performance services that power the company’s next‑generation financial platform – including applications for deal execution, invoicing, payment distribution and financial reporting. You’ll play a critical role in architecting backend systems, integrating with external platforms and delivering features that support complex revenue and transaction workflows across the business.

Key Responsibilities:

• Design and implement services that support revenue workflows, payment logic and invoicing pipelines.
• Build robust APIs and full‑stack features, leveraging type‑safe ORM tooling for schema management and query composition.
• Own integration with internal systems (e.g., Salesforce, NetSuite) and external providers (e.g., banks, payment processors).
• Implement structured financial logic such as contingent payments, commission calculations and milestone‑based billing.
• Integrate AI/LLM capabilities using Claude (Anthropic) and leverage Cursor as a core development tool to accelerate delivery.
• Build and deploy infrastructure in AWS.
• Translate complex business rules into deterministic backend logic: commissions, milestones, payee splits and contingent payments.
• Implement robust data flows between Client Processing, Deal Management and Authoritative Data domains.
• Work closely with product managers, architects and finance stakeholders to deliver end‑to‑end features.

Must-have Skills:

• 7+ years of software engineering experience with a focus on backend/full‑stack development.
• Experience with a TypeScript‑native ORM in production (Drizzle or Prisma strongly preferred); comfort owning schema migrations, relations and query optimisation.
• Deep experience with Node.js, GraphQL and PostgreSQL in production environments.
• Hands‑on expertise with AWS services: EC2, Lambda, RDS, S3, IAM.
• Familiarity with event‑driven systems (Kafka, SQS or similar), API integrations and micro‑service patterns.
• Strong understanding of data modelling, transaction workflows and secure service architecture.
• Comfortable working across systems where compliance, auditability and financial accuracy are critical.

Nice-to-Have:

• Experience with financial systems (payments, trust accounting, GL integration, revenue recognition).
• Familiarity with Salesforce, NetSuite, Concur or related business platforms.
• Experience with serverless architecture and FaaS patterns.
• Understanding of multi‑party payments, invoicing workflows or tax handling (e.g., 1099s, VAT).
• Familiarity with Anthropic’s Claude API and AI‑assisted development tools like Cursor; experience integrating LLM capabilities or shipping AI‑powered features.
• AI Tooling proficiency: ability to leverage one or more AI tools to optimise and augment day‑to‑day work, including drafting, analysis, research or process automation; provide recommendations on effective AI use and identify opportunities to streamline workflows.

What We Offer:

• A high‑impact environment.
• Commitment to professional development.
• Flexible and collaborative culture.
• Global opportunities.
• Vibrant community.
• Total rewards.

Benefits are determined by employment type and location.