Cyber Sphere · 7 hours ago
Java Backend Engineer (Java 17 + ADX/KQL + Event Hub + Search/Retrieval APIs)-Location-Hybrid @ Dayton, OH
Dayton, OH
Contract
Hybrid
Senior LevelCyber Sphere is seeking a Senior Backend Contractor to build and operate a Java 17, event-driven service in Azure AKS. The role involves owning the end-to-end process from requirements to implementation while ensuring performance and reliability of the service.
Business IntelligenceInformation ServicesInformation TechnologyProject ManagementStaffing Agency
Hiring Manager
Sai srikar
Responsibilities
Implement Event Hub consumption patterns: consumer groups, partition awareness, batching, checkpointing strategy, retries/DLQ, idempotency
Design and tune thread pools and scheduled work (e.g., backfills/replays/retries) with safe operational controls
Build robust JSON parsing/validation, schema evolution handling, and error routing
Write KQL queries for search/filter use cases and operational diagnostics
Profile and tune ADX queries (query plan/diagnostics), reducing p95 latency and cost for hot queries
Create clear query patterns and guardrails (parameterization, paging strategy, consistent query shapes)
Define clean API contracts for search results: returned fields, filters, pagination semantics, error handling
Implement retrieval “views” carefully (versioned, testable, limited scope) to avoid a server-side dumping ground
Apply JWT authentication patterns and integrate with internal auth requirements
Make safe updates to Helm chart values
Use ArgoCD workflows to deploy and understand diffs/sync/rollback
Troubleshoot common AKS runtime issues: CrashLoopBackOff, OOMKilled, probe failures, CPU throttling, config/secrets/Managed Identity failures
Write strong unit tests (JUnit; mock only boundaries) and integration tests against key dependencies (ADX/ADLS/Event Hub) or realistic test doubles
Create repeatable performance tests and publish results/thresholds
Qualification
Required
Senior-level experience shipping and operating production backend services
Java 17: concurrency/thread pools, scheduled work, resilience patterns, profiling (CPU/GC/threading)
Event-driven systems (Event Hub/Kafka equivalents): idempotency, retries/DLQ, replay/backfill safety
ADX / KQL: proven ability to write and tune/profile queries (not just run them)
API design: production experience building search/filter endpoints and retrieval endpoints with stable contracts
AKS/Kubernetes literacy: can deploy and debug your service (pods, logs, resources, probes, HPA basics)
Security basics: JWT validation/claims awareness; practical Managed Identity understanding for accessing Azure services
Demonstrated history of becoming the 'go-to' engineer/SME for a service or subsystem
Proven ability to drive initiatives: propose roadmap items, shape scope, and deliver with minimal oversight
Strong written communication: can produce clear design notes/runbooks and explain complex issues to other teams
Preferred
Direct hands-on experience with Azure Event Hubs, ADLS Gen2, AKS, and ADX in the same system
HashiCorp Vault and/or Akeyless integrations and secret management patterns
Helm chart authoring (not just values editing) and ArgoCD operational experience
API 'views' / projection patterns, versioning strategies, and backward compatibility discipline
Broader 'search architecture' experience (facets/filter UX, result shaping, pagination edge cases, indexing strategy)
Observability maturity
Company
Cyber Sphere
Cyber Sphere is an IT consulting firm that offers business intelligence, application development, business analysis, and quality assurance.
Founded in 2004
51-200 employees
H1B Sponsorship
Cyber Sphere has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
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Trends of Total Sponsorships
2025 (12)
2024 (14)
2023 (18)
2022 (13)
2021 (13)
2020 (13)
Funding
Current Stage
Growth StageCompany data provided by crunchbase