AVAILABLE FOR OPPORTUNITIES
📍 Bengaluru, India · 30-day notice · open to hybrid, on-site and remote
Arun Kumar Kulkarni
Specializing in
4Years Production Stack
4,061Requests, Zero Failures @ 600 RPM
11Locales Shipped
Professional Experience
Work History
Senior Software Engineer
Altimetrik India (Contractor — WEX Health)
Client: Modern Benefits Platform | Claims Web API & Consumer Claims Micro-Frontend | FSA/HSA/HRA Consumer-Directed Accounts
- Designed and shipped a participant-facing claim filing-eligibility API to production spanning controller, CQRS query handler, orchestration service, side-effect-free rules engine, and stored-procedure settings repository with OpenAPI client.
- Implemented five-level configuration resolution with per-setting merge semantics falling back from specific scope to global defaults; scoped 4 of 7 checks out to preserve bounded contexts.
- Diagnosed EF Core DbContext thread-safety failures under parallel execution; fixed 6 behavioral divergences from legacy pre-PR and locked in with regression tests.
- Strengthened multi-tenant query scoping, tenant-isolation boundaries, and hardened database shard resolution across receipt-download and claim-filing paths.
- Authored JMeter load tests at 75 concurrent users and 600 RPM: measured p95 of 3.3s and p99 of 4.2s across 4,061 samples at 0% errors against a 2s QA SLA.
- Delivered Consumer Claims transfer-method MFE (React 19, TypeScript, Vite) replacing wizard step with review dialog across 11 locales with Vitest & RTL test suite.
- Remediated critical XSS vulnerability across 4 legacy WCF services with custom JSON serialization HTML escaping and feature flag rollout.
- Delivered HSA investment onboarding custom text end to end across legacy .NET Framework strangler service and .NET Core BFF fronting it; validated in ReadyAPI.
Project Engineer
Wipro Ltd (Client: FedEx Australia)
Client: Cross-Platform Mobile Engineer | Courier Express Platform
- Developed and maintained cross-platform mobile features for courier and express logistics application using C#, .NET, Xamarin.Forms, and .NET MAUI with MVVM architecture and SQLite local persistence.
- Integrated RESTful APIs over HTTPS and analysed request/response contracts and application flows across the codebase to support feature delivery and defect investigation.
- Wrote and optimized SQL queries for data retrieval and reporting, reducing redundant database calls and improving application responsiveness.
- Performed unit testing and debugging across multiple app modules in an Agile/Scrum environment, resolving defects ahead of release.
- Recognized with the Panache Best Newcomer Award for independently resolving complex design-flow issues within two months of joining.
Production Portfolio
Featured Work & Experience
Real-world distributed systems, offline-first mobile logistics, high-throughput microservices, and full-stack SaaS.
Health Benefits & Claims Platform
Claims Web API
ASP.NET Core · C# · MediatR CQRS · SQL Server · Multi-Tenant
5-Level Config ResolutionPer-Setting Merge
L1Offering / Plan Scope
Highest PriorityL2Employer Settings
Group PolicyL3Administrator Config
Admin LevelL4Business Unit Hierarchy
Org UnitL5Global System Defaults
Base DefaultCaught a p95 latency regression before QAJMeter
75Concurrent Users
600 RPMThroughput
4,061Samples · 0.00% Errors
3.3sp95 (vs 2.0s SLA)
Wipro / FedEx AustraliaPanache Award 2022 🏆
Courier & Logistics Platform
C# · .NET · Xamarin / MAUI · MVVM · SQLite · REST APIs
Mobile Engineering & API SpecsREST Specs
2 TeamsAndroid & iOS Specs
MVVMSQLite Persistence
AwardPanache 2022
Consumer Claims
Micro-Frontend
React 19 · Module Federation · i18n
$1,250.00
✓ ACH Validated
Enterprise Security · Legacy WCF Services
XSS Remediation Layer
C# · WCF / .NET Framework · Newtonsoft HTML Escaping · Feature Flags
4 WCF Services RemediatedFeature-Flagged RolloutCustom MediaTypeFormatter
BEFORE
// Before: Legacy WCF Service – raw unescaped JSON response serializer
[WebGet(ResponseFormat = WebMessageFormat.Json)]
public Stream GetParticipantClaim(string claimId) {
var claim = _claimsRepo.Fetch(claimId);
// Unencoded user-controlled markup returned directly in JSON response
string json = JsonConvert.SerializeObject(claim);
return new MemoryStream(Encoding.UTF8.GetBytes(json));
}
AFTER
// After: WCF Custom JsonMediaTypeFormatter with HTML Escaping & Feature Flag
public class SafeJsonMediaTypeFormatter : JsonMediaTypeFormatter {
public SafeJsonMediaTypeFormatter() {
// StringEscapeHandling.EscapeHtml safely encodes <, >, &, ', " in JSON strings
SerializerSettings.StringEscapeHandling = StringEscapeHandling.EscapeHtml;
}
}
// Scoped strictly to application/json via IDispatchMessageInspector hook
// Shipped behind feature flag for instant zero-downtime rollback capability.
Live Production App
RoutineIQ
Full-stack habit tracker at tryhabitflow.com
RoutineIQ
Build habits that stick
Next.jsConvexThree.jsPWAClerkCloudflareFirebase
Open Source Engineering · github.com/arunkumar-dot
Featured Projects
Open-source local document Q&A and distributed queue-based scrapers.
🤖 AI & Vector Search$0.00
Lumen — Local-First Document Q&A API
Local hybrid RAG pipeline with pgvector semantic retrieval, full-text search, and streamed LLM inference via Ollama
TypeScriptHonoNode.jsSupabase (pgvector)OllamaDocker
⚡ Distributed QueuesBullMQ
Distributed Hacker News Scraper
Queue-driven ingestion pipeline for Hacker News items, built on Hono, BullMQ, Redis and PostgreSQL
TypeScriptNode.jsHonoBullMQRedisPostgreSQLPrisma
Technical Skills
The Stack
Languages
Backend
Frontend
Architecture
Testing
Security
Databases
Cloud & Tooling
Mobile
Practices
Education & Certifications
Credentials & Recognition
B.Tech — Electronics and Communication Engineering
Microsoft Certified: Azure Fundamentals (AZ-900)
Panache Best Newcomer Award
Scouts & Guides Rashtrapati (President's) & Rajyapuraskar (Governor's) Awards
Contact & Open Source
Let's Connect
$ contact --email
arunkulkarni2000@gmail.com
$ contact --location
📍 Bengaluru, Karnataka, India
$ contact --github
Fetching profile…
$ gh repo list --featured
📦 Lumen — Local-First Document Q&A API$0.00
Local hybrid RAG pipeline with pgvector semantic retrieval, full-text search, and streamed LLM inference via Ollama
📦 Distributed Hacker News ScraperBullMQ
Queue-driven ingestion pipeline for Hacker News items, built on Hono, BullMQ, Redis and PostgreSQL
$ download --resume
$ contact --linkedin
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