Senior AWS Engineer

Requirements:

• Strong proficiency in Python 3.12+ and experience writing well-structured, testable ETL code.
• Strong proficiency in current LTS Node.js, including ES6+, async/await, and JavaScript or TypeScript for AWS Lambda microservices.
• Experience designing and operating microservice architectures with single-purpose services, loose coupling, independent deployment, event contracts, and idempotency.
• Experience with AWS Glue (PySpark, Glue 4.0, DynamicFrames) and AWS Lambda using Python and Node.js runtimes.
• Experience with AWS Step Functions and Amazon States Language for workflow orchestration.
• Experience with AWS SAM or CloudFormation for infrastructure as code and multi-environment deployment.
• Proficiency in Oracle SQL, including complex joins, DML across transactional schemas, and stored-procedure-like patterns.
• Experience with DynamoDB key design, GSIs, conditional writes, and pagination.
• Experience with S3 event-driven architectures, EventBridge notifications, and data lake patterns such as Parquet.
• Strong testing practices using pytest or unittest, Jest or Mocha, AWS service mocks such as moto and aws-sdk-client-mock, and offline testing of Spark or Glue dependencies.
• Experience working with financial or transactional data where correctness, auditability, and idempotency are critical.
• CI/CD experience, preferably with Jenkins and multi-environment promotion gates.
• Familiarity with CloudWatch metrics and logs, Grafana, and operational dashboards.

Responsibilities:

• Design, build, and maintain independently deployable, single-purpose AWS Lambda microservices within an event-driven architecture.
• Develop Node.js services for transaction-file intake, validation, transformation, submission, and acknowledgement handling across JSON, XLSX, and CSV formats.
• Build services triggered by S3 notifications, EventBridge, SQS, and API Gateway, and define clear contracts between them.
• Integrate AWS services including S3, DynamoDB, SNS/SES, Secrets Manager, and Step Functions using the AWS SDK for Node.js, preferably version 3.
• Manage dependencies, Lambda layers, bundling, and function performance settings such as cold starts, memory, and timeouts.
• Establish service boundaries and event, schema, and S3-format contracts that support independent development and deployment.
• Maintain and extend AWS Glue ETL jobs using PySpark and native Oracle JDBC to ingest, transform, and reconcile transaction history and position snapshot files.
• Build and troubleshoot Step Functions workflows for file validation, ingestion, reconciliation, and alerting.
• Develop and maintain Python and Node.js Lambda functions for orchestration, validation, DynamoDB writes, and SNS/SES alerts.
• Write and optimize Oracle SQL against complex financial schemas.
• Manage DynamoDB models for transaction history, reconciliation status, and fund-level summaries, including GSIs and TTL-based retention.
• Implement robust error handling and transactional integrity, including per-record commit or rollback, idempotency, and duplicate detection.
• Apply retries, dead-letter queues, and idempotency keys to prevent duplicate processing when S3 events are delivered more than once.
• Own and improve unit, integration, and smoke test suites and maintain code coverage.
• Support CI/CD pipelines using Jenkins and AWS SAM or CloudFormation, including builds, tests, linting, and Node.js service packaging.
• Build and maintain observability through structured CloudWatch logs and metrics, Grafana dashboards, and pipeline-health metric registries.
• Participate in security reviews and remediate findings involving SOC 2 alignment, SQL injection safeguards, least-privilege IAM, KMS encryption, and Node.js dependency vulnerabilities.
• Create and maintain architecture references, runbooks, deployment guides, and changelogs.

Technologies:

• API
• AWS
• AWS Glue
• Lambda
• CI/CD
• CloudWatch
• ES6
• ETL
• Grafana
• IAM
• Support
• JSON
• JavaScript
• Jenkins
• Jest
• Mocha
• Oracle
• Python
• PySpark
• SQL
• Security
• Serverless
• Spark
• TypeScript
• microservices
• pytest
• NodeJS
• Cloud
• NPM

More

We are seeking a Senior AWS Engineer to extend an event-driven, serverless financial platform combining Python-based AWS Glue ETL pipelines with Node.js Lambda microservices. The pay range is $55–$60 per hour. We offer medical, dental, and vision insurance; a 401(k); a health savings account; short- and long-term disability coverage; life and AD&D insurance; paid sick leave where required by law; supplemental insurance options; identity theft protection; pet insurance; employee wellness programs; an employee assistance program; and career growth and professional development opportunities. Benefit eligibility and terms may vary by employment status, length of service, and work location, and plans may be changed in accordance with applicable laws. Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc. provides technology staffing and workforce solutions to Fortune 500 companies, government agencies, and enterprise organizations across the United States and Canada. We serve IT, engineering, life sciences, clinical, and professional staffing sectors, with recruitment operations across North America and Asia. We are a certified Minority Business Enterprise and hold ISO 9001, ISO 14001, ISO 27001, and SOC 2 Type II certifications.

last updated 43 week of 2026