Senior/Staff Platform Software Engineer (AI)

Location: Madrid, Spain; hybrid, with remote work up to 3 days per week

Company

Nextlane develops software that simplifies and digitizes the automotive customer journey for manufacturers and dealerships.

What you will do

• Design, build, and operate APIs, gateways, and integration services connecting dealer management systems, OEMs, partners, and cloud products.
• Build and migrate OEM and partner integrations on a standardized integration platform.
• Define versioned entity contracts, API policies, authentication, authorization, and partner access models.
• Improve reliability and security through SLOs, alerts, contract tests, staged releases, rollback, vulnerability management, and incident leadership.
• Develop AI-assisted integration workflows, coding tools, code review, and testing with human approval and governance.
• Set technical direction, lead migrations, review designs and code, coach engineers, and create documentation and runbooks.

Requirements

• 8+ years of software engineering experience at Senior or Staff level.
• Experience building and operating production APIs and integrations relied on by teams or partners.
• Experience modernizing long-lived software while keeping it running.
• Experience using AI coding assistants and agents on large, long-lived codebases beyond demos.
• Fluent English is mandatory; interviews are conducted in English.
• Strong experience with C#/.NET or Java.
• Experience with REST, API versioning, backward compatibility, API gateways, OAuth2, integration patterns, messaging, and events.
• Experience with Azure, AWS, containers, Kubernetes, CI/CD, automated and contract testing, and observability.
• Knowledge of LLM tooling, context engineering, agents, MCP, evaluation, and AI security, including data leakage, prompt injection, and secrets.
• Ability to build trust quickly, communicate clearly in writing, demonstrate solutions, and remain realistic about AI limitations.

Nice to have

• Automotive, DMS, or CRM software experience.
• Experience with software installed at customer sites.
• Experience building developer tools or AI workflows for other teams.
• Retrieval over code and documents.
• Open-source contributions.
• French language skills.

Culture & Benefits

• Growth-oriented, collaborative culture with colleagues worldwide and emphasis on learning, diversity, and meaningful products.
• Hybrid flexibility with up to 3 remote days per week and flexible start and finish times.
• Summer Friday schedule, 23 vacation days, and an intensive schedule in July and August.
• Private Adeslas medical insurance, flexible remuneration through COBEE, and continuous learning access.
• €1500 referral bonus after the referred talent completes 6 months; team-building events and afterwork activities.
• Accessibility support and equal-opportunity hiring.

Hiring process

• 30-minute introductory call with Talent Acquisition, followed by an interview with the VP Engineering - Platform.
• Technical interview with the platform architect involving pairing with AI tools on an unfamiliar codebase and an API design discussion.
• Interview with a product team engineering lead.