Senior Software Engineer

AWS Engineer Our client, a technology company providing marketing, sales, and customer support services ranging from consumer goods to the rapidly changing print media space, is looking for an AWS Engineer. This position is remote and is a contract-to-hire opportunity starting ASAP. The compensation range is $70-75/hr W2, and the benefits include eligibility for health, dental, vision, and 401K. Must be authorized to work in the U.S. This position is not eligible for sponsorship. Responsibilities: Architect solutions that scale horizontally and handle heavy traffic without manual intervention; real-time paths like click tracking and lead validation are where latency and correctness both count. Build and operate serverless backends on AWS Lambda behind API Gateway, event-driven flows over EventBridge and SQS, DynamoDB, and Step Functions for orchestration. Write and deploy the infrastructure yourself; every stack we run is AWS CDK v2 in TypeScript. Plan out and execute a path for iteratively migrating legacy applications to newer solutions reading the existing C#, PHP, and SQL Server systems well enough to establish what they really do, then designing and shipping the replacement in sequenced waves alongside a running business. Build and maintain the data pipelines behind partner and internal reporting DynamoDB streams into Aurora PostgreSQL, S3 through Glue into Redshift Serverless, and the materialized views on top. Work with product owners to understand feature needs and integrate them into existing products. Assist our partner companies with integrating to our APIs, and build custom integrations with theirs. Debug applications across the full stack, diving into services and logs to help diagnose issues and replicating customer scenarios. Help define test strategy and triage alongside our QA engineer, and keep quality consistent across the release cycle. Requirements: Substantial experience building and running production software for seven years or more. Production experience with AWS, particularly Lambda, API Gateway, DynamoDB, SQS or EventBridge, S3, IAM, and CloudWatch services you've run and debugged, not only configured. Strong working knowledge of TypeScript and Node.js; you should be productive in it from the start. Production experience with both SQL and NoSQL data stores PostgreSQL, MySQL or SQL Server for relational work, including query tuning and indexing, and DynamoDB or similar for key-value and single-table design. Most of our systems use both. Understanding of infrastructure as code, and experience implementing it yourself with CDK, the Serverless framework, Terraform, CloudFormation or similar. Proven experience working in scalable, high-traffic application platforms Comfortable inheriting systems you did not build, working out what an unfamiliar system actually does and deciding whether to extend it, replace it, or leave it alone. Knowledge of CI/CD workflows and unit testing best practices; we use GitHub Actions across every repository. Strong history of observing best practices with Git and task management. Excellent written communication, and comfort working asynchronously with a small distributed team. Functional knowledge of HTML, CSS, and a modern front-end framework, and comfort maintaining UIs. This is a primarily-backend role, but our team is full-stack in some capacity. Our Stack: Languages: TypeScript and Node.js across every new service and front end; Python for ETL and data tooling; C#, PHP, and T-SQL in the legacy estate being replaced. Compute and APIs: Lambda, ECS behind an ALB, Docker, API Gateway, EventBridge, SQS, Step Functions, DynamoDB Streams. Data: DynamoDB, Aurora PostgreSQL, MySQL, SQL Server, Redshift Serverless, AWS Glue, dbt, Snowflake. Infrastructure: AWS CDK v2 in TypeScript and Serverless Framework Front end: React 18, Vite, TanStack Query, Remix, Shopify Polaris and App Bridge Delivery and quality: GitHub Actions, multi-stage dev / test / prod, Jest, Vitest, ESLint, Prettier, SES, and Postmark Tooling: Enterprise AI coding assistants, in-repo project context, agent-assisted code audits Preferred Qualifications: Previous experience scaling a legacy.NET, PHP, or Java application into modern best-practice standards, and enough C# or PHP to understand what you're replacing Deep experience with AWS's serverless technology offerings Python, particularly for ETL and data work Day-to-day use of AI coding assistants in a real engineering workflow, and the judgment to tell when a confident answer is wrong Transactional email and deliverability at scale SES, Postmark, SPF/DKIM/DMARC, bounce and complaint handling Ad tech experience lead generation, tracking, or attribution Analytics tooling Redshift, AWS Glue, dbt, or Snowflake Consumer privacy and data compliance work, particularly CCPA and DSAR workflows Ecommerce platform integrations; we run a multi-merchant Shopify platform, though prior Shopify experience is not expected Mondo