We're placing a Senior Backend & Infrastructure Engineer with a confidential AI-powered FinTech client approaching enterprise rollout. This is a pure infrastructure and security role - you own the architecture that keeps sensitive financial data secure, the systems that stay up when enterprise clients depend on them, and the integrations that connect LLM pipelines to ERP data without leaking either. The platform is past the prototype stage. They need someone who's built production-grade backend systems at scale, not someone who will learn on the job. Responsibilities • Define and own the high-level infrastructure strategy on AWS - uptime, scalability, and performance are your metrics • Architect secure, resilient backend workflows capable of supporting enterprise-level client deployments on a platform handling sensitive financial data • Implement and enforce security frameworks across all system layers - encryption, network isolation, access controls, compliance boundaries • Design and lock down secure data flows between MCP servers and third-party ERP integrations • Own the Postgres infrastructure - schema design, query optimization, scaling strategy, and backup integrity • Integrate directly into the client engineering team with full support from Bolder's design, DevOps, and QA network Requirements Senior backend track record. You've architected distributed, enterprise-grade backend systems in production - not prototypes, not internal tools. You can point to something that ran at scale, stayed up, and handled real data without incident. Deep AWS expertise. You provision, scale, and secure infrastructure in AWS hands-on. VPCs, IAM, ECS or EKS, RDS, Secrets Manager, CloudWatch - you've used them in anger, not just in tutorials. You know what the AWS Well-Architected Framework says and where to deviate from it. PostgreSQL at scale. Expert-level fluency with Postgres - schema design, indexing strategy, query optimization, migrations, connection pooling, replication. You don't write queries you haven't profiled. Security specialist. Secure communication protocols, data encryption at rest and in transit, network isolation, multi-server environment management. In a FinTech context, you treat security as architecture, not an afterthought bolted on before launch. MCP and integration security. You understand how Model Context Protocol servers communicate and where the attack surface lives. You've thought about securing LLM-to-system boundaries, not just API-to-API ones. AI and data integration fluency. Exposure to LLM orchestration pipelines, automated code generation systems, or ERP data sync tooling. You don't need to have built a custom LLM harness, but you need to understand what's happening inside one well enough to secure it. Proactive communicator. You flag infrastructure risks before they become incidents. You document decisions. You don't go quiet between check-ins and resurface with surprises. Benefits • Fully remote • Target start date of early August 2026 - defined scope, no ambiguity on timing • Direct access to engineering leadership with no PM layers between you and the decisions • Tooling budget for infrastructure, security tooling, and monitoring • A peer network of senior engineers and agentic builders across Bolder's client portfolio