Application Developer

J5 Consulting Cybersecurity Position J5 Consulting is a Maryland based company established in 2006 to provide computing and consulting services for government and commercial entities. Our services improve Information System networking performance and compliance and protect electronic assets from loss and compromise. The Sponsor applies technical resources to accelerate the timely, reliable, and secure delivery of open source data, information, and insights. The Sponsor requires application development support to maintain and enhance an existing social media data exploitation platform. The Contractor will work within an existing team environment. Work will include developing enhancements to an existing service-based Java web application. Required Skills and Demonstrated Experience: Demonstrated experience building and maintaining scalable front-end applications using React and TypeScript, with a solid understanding of component-based architecture, state management, and hooks. Demonstrated experience managing application state using MobX or other state management libraries or solutions within a TypeScript/React environment. Demonstrated experience understanding Node.js; to include competency in developing backend services and APIs using Node.js, with the ability to switch to backend work and integrate front-end with server-side code as required. Demonstrated experience with Elasticsearch; to include designing search functionalities, analytics, including querying, indexing, mappings, analyzers, tokenization, bulk indexing, search DSL, aggregations, reindexing, snapshots, ILM, performance tuning, working with large datasets. Managing at scale: cluster topology, shard sizing, replica strategy, resource limits, JVM tuning, recovery practices. Shard sizing strategy, reallocation, recovery tuning, snapshot impact, and performing rolling upgrades. Demonstrated experience with Database Management with RDS (Relational Database Service); to include proficiency in working with relational databases, specifically with Amazon RDS or similar services, including writing SQL queries, optimizing performance, and integrating with backend applications. Demonstrated experience with version control systems (such as Git) and familiarity with continuous integration/continuous deployment (CI/CD) pipelines to efficiently manage codebase and deployments. Demonstrated experience building and operating ETL (extract, transform, load) pipelines for very large datasets (terabytes to petabytes), with production-grade reliability. Demonstrated experience in TypeScript/JavaScript for backend development (Node.js frameworks like Express, async/await, Promises) and familiarity with the Elasticsearch JS/TS client. Demonstrated experience scripting and programming, with strong skills in Python, Bash, or Go for automation, tooling, data processing and runbook scripting. Demonstrated experience with SQL and experience optimizing complex queries where relevant to upstream data modeling. Demonstrated experience with the ability to evaluate trade-offs between latency, throughput and infrastructure cost, including index retention and storage tiers (Cost-aware mindset). Demonstrated experience with extensive Terraform experience; authoring modules, composition patterns, managing remote state backends and locks (S3), workspaces, provider/version locking, and writing idempotent infrastructure. Demonstrated experience with AWS (Amazon Web Service) networking mastery; to include VPC design, subnets, route tables, IGW, NAT, Transit Gateway, VPC Peering, PrivateLink, VPC endpoints, security groups, NACLs, Direct Connect, VPN and load balancers (NLB/ALB) Demonstrated experience with CI/CD and automation: Git-based workflows, Terraform pipelines (GitHub Actions, GitLab CI, Jenkins). Demonstrated experience with TLS, encryption at rest, IAM (identity and access management) policies or roles, secrets management (Vault, AWS Secrets Manager), network segmentation, audit logging and compliance controls. Demonstrated experience with performance tuning: JVM heap sizing, GC tuning, descriptors/ulimits, OS settings (vm.max_map_count), thread pools, merge and refresh tuning, and bulk/ingest optimizations. Demonstrated experience with disaster recovery and capacity planning for large data sets, including tested backup/restore procedures and runbooks. Demonstrated experience with problem-solving, performance tuning capabilities for ETL jobs, Node.js backends, collaboration skills, with the ability to work across all layers of the stack, collaborate effectively with cross-functional teams, analytics and SRE teams, ability to adapt to evolving project requirements. Demonstrated experience with security and cost optimization patterns (right-sizing, reserved instances/savings plans, tiered storage). Demonstrated experience with strong troubleshooting skills using ES APIs (_cluster/health, _cat, _nodes, _segments, _recovery, _stats), logs, JVM GC analysis, thread-pool diagnostics, and OS-level metrics. Highly Desired Skills and Demonstrated Experience: Demonstrated experience with Apache NiFi for flow-based ingestion and provenance-driven data movement. Demonstrated experience with schema evolution strategies, mapping conflicts, versioning, and automated reindex pipelines. Demonstrated experience with data modeling, metadata management and catalog tools Demonstrated experience with strong communication skills and working cross-functionally with product, analytics and SRE teams. Demonstrated experience working across all layers of the stack when needed, demonstrate problem-solving skills, collaborate effectively with cross-functional teams, and adapt to evolving project requirements. Demonstrated experience running production-critical distributed systems. This position requires US Citizenship. Verification of US Citizenship to meet federal government security requirements will be confirmed. The successful candidate must have an active U.S. Government Top Secret Security Clearance with a Full Scope Polygraph. Clearance Verification: This position requires successful verification of the stated security clearance to meet federal government customer requirements. You will be asked to provide clearance verification information prior to an offer of employment. This position is expected to be onsite. The position will be located within the Washington Metropolitan Area (WMA). Local travel/POV will be on an as needed basis, within the local place of performance. Join J5 Consulting and Grow Your Cybersecurity Career At J5, we're a team of innovators protecting organizations from evolving cyber threats. With 18+ years of success in government and commercial sectors, we offer meaningful opportunities to grow your career. Enjoy comprehensive benefits, including: 100% employer-paid health coverage a 6% 401(k) match PTO tuition reimbursement bonuses professional development, and more. Ready to make an impact? Explore our open positions and apply today.