Senior Full Stack Engineer at eSimplicity - Silver Spring, MD, US

eSimplicity is modern digital services company that work across government, partnering with our clients to improve the lives and ensure the security of all Americans—from soldiers and veteran to kids and the elderly, and defend national interests on the battlefield. We are seeking a Senior Full Stack Engineer to join a cross-functional, entrepreneurial, collaborative team dedicated to solving difficult problems for our client. In this role, you will help develop a solution in full, from high-level system design and configuration to application development and data integration.

Designs, creates, and builds web application features; creates back-end code and interfaces for new web platforms; analyzes user needs to implement front-end design, graphics, performance, and capacity; integrates applications with other platforms as needed. Solid understanding of LLM and AI concepts Collaborates with other team members across multiple functional areas (engineering, DevOps, UX, Product, Scrum Master) Experience using modern, open-source software frameworks to prototype and deploy full-stack web applications, including all aspects of server-side processing, data storage, networking, content delivery, and monitoring. API documentation, deployment operations).

Quickly adopts new programming tools, frameworks, and techniques. Understands and accounts for the challenges involved in managing access to and usage of large data sets Translates designs and wireframes into reusable, testable and efficient front-end code Builds, iterates, and tests scalable, back-end APIs for web applications Designs and develops data models to optimize data access for web applications Integrates 2nd and 3rd party platforms and APIs Participates in Agile processes including daily standups, demos, retrospectives, and sprint planning Collaborates with a fully integrated Agile team to deliver continuous improvement to designs, processes, and standards. Expertise with modern web application frameworks such as React.js, Next.js, Node.js, Flask, Playwright, Poetry, OpenAPI, Experience with testing frameworks and tools such as Cucumber, PyTest Experience with AI/Agent Platforms such as LangChain, LangGraph, etc Deep understanding of APIs, and familiarity with JSON, Web APIs, REST APIs, JSON-RPC, XML-RPC, RESTful practices, and GraphQL Experience in implementing, deploying, and maintaining both relational and non-relational databases like SQL, MySQL, PostgreSQL, MongoDB or similar Experience with Vector Databases and Graph Databases, Neo4j, Qdrant, Pinecone Experience with Docker containerization and deployments Extensive experience using Git and CI/CD platforms to deliver safe releases at a rapid rate.

Experience in AWS cloud data architecture Experience working on a fully integrated Agile product team smaller than 10 people. Experience with benchmarking, monitoring, and performance engineering applications with tools such as Grafana, Sentry, and Prometheus A demonstrated preference for the “correct” amount of unit and integration tests, across a variety of platforms. Flexible and willing to accept a change in priorities as necessary.

Excellent command of written and spoken English. Knowledge of AuthN and AuthZ systems, including Okta, OAuth, SAML and AWS IAM Policies/Roles using attribute-based access controls Knowledge of message queues/buses and their associated design patterns (Kinesis, Kafka, RabbitMQ, NATS) eSimplicity supports a remote work environment operating within the Eastern time zone so we can work with and respond to our government clients. Occasional travel for training and project meetings.

It is estimated to be less than 25% per year. All qualified applicants will receive consideration for employment without regard to race, religion, color, national origin, gender, age, status as a protected veteran, sexual orientation, gender identity, or status as a qualified individual with a disability. #