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Principal JavaScript/Node.js MCP Engineer (FinTech Project)

Sigma Software · Kraków, Lesser Poland Voivodeship, Poland

LeadExternal listingfull-time7 days ago

About The Role

  • Design and implement core MCP platform capabilities, including MCP clients, servers, tool invocation workflows, and integrations with existing backend services
  • Define reusable reference architectures, engineering standards, and development patterns for MCP-compatible systems
  • Build shared TypeScript/Node.js libraries, SDKs, starter kits, templates, and tooling that accelerate adoption across engineering teams
  • Design scalable approaches for conversation state management, agent orchestration, context handling, authentication, and versioning
  • Establish architectural guidelines for selecting appropriate integration patterns, including MCP, A2A, APIs, and service-to-service communication
  • Collaborate with multiple engineering teams to review technical designs, ensure consistency, and drive platform adoption
  • Create technical documentation, best practices, and onboarding materials for developers working with MCP integrations
  • Mentor engineers and provide technical leadership across platform and backend initiatives
  • Contribute to long-term platform scalability, maintainability, and engineering governance
  • At least 7 years of production experience with JavaScript, TypeScript, and Node.js
  • Extensive experience in Back-End or platform engineering, including technical leadership at Principal or Staff level
  • Proven expertise in designing distributed systems, APIs, SDKs, developer platforms, or Back-End frameworks
  • Deep understanding of scalable architecture design, interface contracts, versioning strategies, and reusable platform components
  • Hands-on experience with MCP clients, servers, resources, tools, and LLM tool invocation patterns
  • Experience building AI-enabled platforms or LLM-based integrations
  • Knowledge of Developer Experience best practices and internal platform engineering
  • Experience driving technical initiatives across multiple engineering teams and stakeholders
  • Experience defining enterprise engineering standards and governance models
  • Ability to balance strategic architectural thinking with hands-on implementation
  • Experience working in cloud-native and microservice-based environments
  • At least an Upper-Intermediate level of English

WILL BE A PLUS

  • Experience with Agent-to-Agent communication and orchestration frameworks
  • Familiarity with FinTech or regulated environments
  • Experience designing reusable SDKs or integration frameworks

PERSONAL PROFILE

  • Strong technical leadership and ownership mindset
  • Excellent collaboration and cross-team communication skills
  • Ability to drive engineering alignment in complex organizations
  • Proactive problem solver with strategic thinking capabilities
  • Passion for platform engineering, developer enablement, and scalable architecture
  • Comfortable operating in fast-paced and evolving technical environments

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