Senior Full-Stack Technical Lead (React/Next.js, Java/Spring Boot & Agentic AI) - 0596

S.I. Systems Ltd.; Toronto; Hybrid; CAD 185,000 - 271,000; Full time

Job summary

S.I. Systems Ltd. seeks a hands‑on Senior Full‑Stack Technical Lead to drive enterprise digital products using React/Next.js, Java/Spring Boot and AI‑enabled features.

You will guide end‑to‑end delivery, build reusable components, and establish cloud, CI/CD and testing pipelines while remaining engaged in coding and production support. The position requires 8+ years in complex enterprise projects, strong TypeScript/React/Next.js and Java/Spring Boot skills, and experience with API contracts,

Qualifications

• 8+ years building and operating complex enterprise digital products as a Technical Lead or senior full‑stack developer.
• Strong TypeScript, React and Next.js expertise covering component architecture, SSR, accessibility and performance.
• Strong Java and Spring Boot experience with REST APIs, microservices and production troubleshooting.
• Experience with REST, GraphQL, event‑driven services, API contracts and auth.
• Cloud infrastructure, containers, Terraform, CI/CD pipelines and source‑control workflows.

Responsibilities

• Design, develop, test and deploy end‑to‑end solutions using TypeScript, React, Next.js, Java and Spring Boot.
• Build reusable UI components, design‑system patterns and orchestration services for personalized journeys.
• Implement REST and GraphQL integrations, APIs through Apigee, and event‑driven integration with Kafka.
• Establish cloud infrastructure, Terraform configurations and CI/CD pipelines with enterprise platform teams.
• Develop AI‑enabled features with retrieval/RAG, prompts, tool integration and production monitoring.
• Define engineering standards, lead code reviews and document designs with UML.

Job description

Senior Full-Stack Technical Lead (React/Next.js, Java/Spring Boot & Agentic AI) - 0596

Senior Full-Stack Technical Lead (React/Next.js, Java/Spring Boot & Agentic AI) - 0596

Duration: 12 Months

Location: Toronto or London (Hybrid, 3x/week)

Overview

Our Insurance Client's Enterprise Digital Strategy and Delivery team is seeking a hands‑on Technical Lead to build enterprise digital products across front‑end applications, backend services, integrations and AI‑enabled features. This role will establish reusable engineering capabilities, cloud infrastructure, delivery pipelines and automated quality controls while remaining directly involved in coding and production troubleshooting.

Responsibilities

• Design, develop, test and deploy end‑to‑end solutions using TypeScript, React, Next.js, Java and Spring Boot, including APIs, event‑driven services and supporting data stores.
• Build reusable UI components, design‑system patterns and orchestration services that connect content, customer context, data and actions into personalized digital journeys.
• Implement REST and GraphQL integrations, APIs through Apigee, and event‑driven integration using Kafka or comparable platforms.
• Establish cloud infrastructure, container environments, Terraform configurations and CI/CD pipelines, working with enterprise platform teams on shared services and controls.
• Develop AI‑enabled and agentic features using retrieval/RAG, prompt engineering, structured outputs, MCP‑based tool integration and agent interactions, with evaluation, guardrails, human oversight and production monitoring.
• Embed automated unit, component, contract, API, integration, end‑to‑end, accessibility, performance and security testing into delivery pipelines.
• Apply approved AI engineering tools to development, refactoring, testing, debugging and documentation while maintaining human review and secure‑development controls.
• Define engineering standards, lead design and code reviews, document designs using UML, and work with Solution Architects on build, buy and reuse decisions.
• Instrument applications and services, troubleshoot issues across the stack, and improve production reliability, performance and operational readiness.

Must‑Have Requirements

• 8+ years building and operating complex enterprise digital products, including experience as a Technical Lead, Staff Engineer or senior full‑stack developer, with recent hands‑on delivery across both front‑end and backend layers.
• Strong TypeScript, React and Next.js experience covering component architecture, state management, server‑side rendering, accessibility, responsive design and front‑end performance.
• Strong Java and Spring Boot experience covering REST APIs, microservices, asynchronous processing, data access, automated testing and production troubleshooting.
• Experience designing and integrating REST, GraphQL and event‑driven services, including API contracts, authentication, resiliency and graceful failure handling.
• Hands‑on implementation of cloud infrastructure, containers, Terraform, source‑control workflows and CI/CD pipelines.
• Strong test‑driven development and quality automation experience across functional, integration and non‑functional testing, with automated quality gates.
• Practical use of AI‑assisted engineering tools, such as Claude Code or GitHub Copilot, within approved security and code‑review controls.
• Hands‑on delivery of AI/ML‑enabled product features, including retrieval/RAG, prompts, structured outputs, tool integration, evaluation, guardrails and production monitoring, with agent frameworks such as LangGraph, CrewAI or Microsoft Agent Framework.
• Experience building reusable platform capabilities or modernizing fragmented applications, including shared components, service templates and integration patterns.
• Enterprise integration experience spanning API gateways, Kafka or comparable event platforms, headless content, personalization, feature flags, experimentation, analytics, caching, and relational or document databases.
• Ability to implement CIAM using Okta Auth0, entitlements, consent, privacy, security and audit controls within end‑to‑end solutions.
• Strong observability practices using logs, metrics, distributed tracing and alerting, with OpenTelemetry, Azure Monitor/Application Insights or comparable tooling.
• Working knowledge of secure software supply chains, dependency management, secrets management and controls for AI‑assisted development.

Nice‑to‑Have Requirements

• Kubernetes and AWS experience.
• Microsoft Azure experience.
• Financial services, insurance or comparable regulated‑industry experience.

Disclaimer: AI may be used in evaluating candidates. This posting is for an existing vacancy.