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Software Architect
Engineering Tech Lead – Node.js Architect
Role
Engineering Tech Lead – Node.js Architect (Contract, 3 Days/Week On-Site)
Job Location
Sheffield, UK – Inside IR35
Job Summary
We are seeking a highly skilled Engineering Tech Lead – Node.js to lead the design, development, and evolution of scalable, high-performance backend systems. The ideal candidate should possess:
- Deep technical expertise in the Node.js ecosystem
- Strong architectural and system design capabilities
- Proven experience leading engineering teams through complex challenges
This role requires a hands-on leader who can:
- Drive technical strategy
- Mentor engineers
- Establish best practices
- Architect distributed systems capable of handling enterprise-scale workloads
Experience & Eligibility
10–15+ years of software development experience, including:
- At least 5+ years of hands-on Node.js expertise
- Experience leading engineering teams
- Proven track record in large-scale backend platforms
Key Responsibilities
Technical Leadership & Architecture
- Lead the architecture, design, and development of mission-critical backend applications using Node.js.
- Design scalable, secure, and highly available distributed systems and microservices.
- Define engineering standards across projects and drive technical decision-making.
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Team & Process Management
- Collaborate with Product Managers, Architects, DevOps, QA, and cross-functional teams.
- Mentor and guide engineers through technical challenges and career growth.
- Enforce code review best practices and ensure maintainability and performance.
System Optimisation & Security
- Optimise application performance, scalability, reliability, and observability.
- Implement system security, compliance, and data privacy standards.
- Design APIs and integration patterns for internal/external systems.
Operations & Technical Excellence
- Establish CI/CD pipelines and promote DevSecOps practices.
- Participate in production support, incident management, and root cause analysis.
- Lead technical discussions on architecture, system trade-offs, and technology adoption.
Required Technical Skills
Node.js Expertise
- Advanced JavaScript (ES6+) and TypeScript mastery.
- Deep knowledge of:
- Event Loop
- libuv
- Worker Threads
- Cluster Module
- Streams & Buffers
- Memory Management & GC
- Hands-on experience with:
- Express.js
- NestJS
- Fastify
- Koa
Software Architecture & Design
- Microservices architecture
- Event-driven systems
- Domain-Driven Design (DDD)
- Hexagonal/Clean Architecture
- CQRS & Saga pattern
- API Gateway patterns
- Experience in high-throughput, low-latency systems
- Scalability techniques (horizontal scaling, load balancing, auto-scaling)
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API & Integration
- RESTful API design
- GraphQL & gRPC
- WebSockets
- OpenAPI/Swagger
- Third-party system integrations
Databases
SQL
- PostgreSQL
- MySQL
NoSQL
- MongoDB
- Redis
- Elasticsearch
Core Concepts
- Data modeling
- Indexing & query optimization
- Transactions
- Replication & sharding
Messaging & Distributed Systems
- Apache Kafka
- RabbitMQ
- AWS SQS/SNS
- NATS
- Event sourcing
- Idempotency & retry strategies
- Dead-letter queues
- Eventual consistency
Cloud & Infrastructure
- AWS, Azure, Google Cloud Platform
- Docker & Kubernetes
- Helm & Terraform
- CI/CD & Infrastructure as Code (IaC)
Observability & Performance
- Centralised logging
- Distributed tracing
- Metrics collection
- Monitoring dashboards (Prometheus, Grafana)
- OpenTelemetry
- ELK Stack
Security
- OAuth 2.0 & OpenID Connect (OIDC)
- JWT authentication
- RBAC/ABAC
- OWASP Top 10
- Secure API development
- Secrets management & encryption best practices
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