Senior Infrastructure Engineer

We are looking for a Senior Infrastructure Engineer (SFIA Level 7 aligned), operating as an autonomous expert on complex, high-impact systems, to scale, harden and operate an AWS platform supporting high-traffic event and webinar workloads.

This role requires strong ownership, the ability to work across high-context architectures, and to safely deliver changes impacting multiple systems in production-critical environments.

Overview

A senior infrastructure engineer to scale, harden and operate the AWS platform behind high-traffic event/webinar workloads, ECS/Fargate services, lambdas, Aurora, Redis and CI/CD.

Platform context

Event and webinar platform: React web app, React Native mobile app, Express/Node API,

Socket.IO/websocket service, async worker services, AWS-hosted micro-lambdas for bulk email, file conversion,

sync, upload/export and integrations, Puppeteer-based video playback services, Redis caching, Jenkins builds,

ECS/Fargate workloads, VPC-managed infrastructure, and MySQL Aurora.

Why this role needs a high-skill operator

• The platform is live-event critical: defects can affect attendee access, sponsor/exhibitor value, webinar delivery,

registration, meetings or event-day operations.

• Many changes cross old and new architecture boundaries, including web/mobile clients, Express API modules,

database state, Redis caches, websocket events, lambdas and deployment infrastructure.

• The role requires judgement, domain understanding and safe refactoring discipline rather than narrow ticket execution.

Role purpose

• Own production infrastructure reliability, scalability, security and deployment safety across the event platform.

• Make ECS/Fargate, Lambda, VPC, Aurora, Redis and CI/CD operations predictable before and during major event peaks.

Key responsibilities

• Design and maintain AWS infrastructure for Node/Express APIs, websocket services, async workers, Puppeteer video playback services and supporting lambdas.

• Own ECS cluster and Fargate task definitions, service discovery, autoscaling policies, health checks, blue/green or rolling deployment strategy and capacity planning.

• Manage grouped infrastructure and VPC concerns including subnets, NAT, security groups, IAM boundaries, secrets, private connectivity and allowlisted egress.

• Operate Aurora MySQL, Redis/Upstash or equivalent cache layers, S3, CloudFront, SQS, DynamoDB, API Gateway, MediaConvert and Secrets Manager integrations.

• Improve Jenkins/CI build and deploy pipelines, environment promotion, image builds, config management and rollback paths.

• Implement observability for API latency, websocket stability, queue depth, Lambda errors, ECS saturation, DB load, cache behaviour and video playback service capacity.

• Create runbooks, dashboards, alarms and incident response workflows suitable for live event support.

• Partner with backend, frontend, mobile and support leads to remove operational bottlenecks and reduce recurring incidents.

Required skills and experience

• Expert AWS operations across ECS/Fargate, Lambda, API Gateway, SQS, S3, DynamoDB, CloudFront, IAM, VPC and Secrets Manager.

• Strong Docker/container operations, autoscaling, health checks, capacity planning and production deployment patterns.

• Aurora MySQL operational knowledge: connections, pooling, indexes, replication/backups, slow query analysis and failover considerations.

• Redis/cache operations, observability and failure-mode planning.

• Jenkins or equivalent CI/CD experience, plus IaC using Serverless Framework, Pulumi, Terraform, CDK or similar.

• Comfort supporting Node.js, Socket.IO/websocket and Puppeteer/headless browser workloads in production.

Expected deliverables / outcomes

• Documented ECS/Fargate scale policies and capacity baselines for peak event/webinar periods.

• Improved CI/CD deployment safety, rollback and environment consistency.

• Production dashboards and alerts linked to actionable runbooks.

• Reduced infrastructure-related incidents, cold-start bottlenecks, queue backlogs and DB/cache saturation.

SFIA Level 7 aligned expectations

• Operate with high autonomy, making sound technical decisions where requirements are incomplete or cross multiple systems.

• Influence architecture, delivery approach, quality standards and production readiness across squads or vendors.

• Handle high complexity and high business impact, especially during event build-up, release windows and live event support.

• Communicate clearly with engineering, QA, product, support and leadership, including trade-offs, risk, mitigation and sequencing.

• Leave systems more understandable through documentation, runbooks, tests, observability and maintainable implementation patterns.

Relevant platform complexity to understand

• Monorepo split across web, API, websocket, worker, shared API Gateway packages, lambdas, docs portals and deployment tooling.

• API bootstrap combines Express, LaunchDarkly, Firebase Admin, Sentry, request-scoped Context, legacy auth flows, route groups and global error handling.

• Backend actions use getter/processor/setter conventions, yup validation, GlobalError handling, Sequelize models, raw SQL paths, transactions and event/user context checks.

• Web state is highly coordinated through Recoil atoms, atomFamily/selectorFamily, derived selectors, callback hooks, Redux models, route gates, sockets, meeting popups, chat and stage state.

• Stage/webinar flows include publisher registries, local device state, presenter state, archiving/composite flags, media files, projector/poll surfaces and socket-driven route behaviour.

• Serverless processing spans SQS, DynamoDB, S3, MySQL, Secrets Manager, MediaConvert, API Gateway, scheduled syncs, file conversion, bulk export, media upload and third-party integration handlers.

• Mobile app is a multi-brand React Native shell with native iOS/Android bridges, APNs/FCM, deep links, Fastlane, Detox/Jest, Stallion bundle resolution, CrowdConnected/ExpoFP floorplan integrations and flavor-specific resources.

• Operational stack includes Redis-backed token/cache usage, Jenkins/CI build steps, ECS/Fargate scale policies, VPC/NAT concerns, Aurora query performance and production incident support.

What do we offer?

• 1066 RON monthly budget in Benefit Online Platform
• 25 vacation days/year.
• Life Insurance cover.
• The employees working on bank holidays will benefit either a paid day off in the next 30 days + 100% of the hourly base salary for that specific day OR 200% of the hourly base salary for that specific day.
• Childbirth allowance of 7000 RON after 1 year in HCLTech.
• In the first 8 weeks, the company will pay the difference of up to 100% for the parental leave granted to pregnant employees.
• Unfortunate events allowance of 7000 RON for first degree relative granted from day 1 in HCLTech.
• Internal trainings and certifications.

HCLTech is a global technology company, home to 219,000+ people across 60 countries, delivering industry-leading capabilities centered around digital, engineering, cloud and AI powered by a broad portfolio of technology services and products. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Our purpose is to bring together the best of technology and our people to supercharge progress. We’re supercharging progress for everyone, everywhere – our clients, partners and their stakeholders, our people, communities, and the planet.

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