Available for opportunities

SUMANTH
PAVULURI

Jul 2024 — Present| Texas Capital| Open to Senior Roles

Backend engineer focused on payments and billing platforms in regulated environments. Currently own the FedNow integration at Texas Capital, handling ~300K daily transactions. Previously shipped GraphQL and Java services for subscription billing across 200+ markets at PayPal.

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SENIOR
About
Backend engineer focused on payments
and billing in regulated environments

I currently own the FedNow integration at Texas Capital, where I built the settlement concurrency model that handles around 300K daily transactions across 8 client banks. End-to-end — technical design, message sequencing, retry semantics, reconciliation.

Earlier at PayPal, I worked on GraphQL and Java services for subscriptions billing across 200+ markets — BFF aggregation, dunning systems, webhook delivery, FX caching. Before that, I ran the on-call for BCBS claims pipelines at Anthem/Elevance.

I enjoy the deep parts of systems work, but I also care about shipping clean code, being useful on-call, and helping the people around me get better.

300K
Daily Txns Handled
8
Banks Onboarded
200+
Markets Served
5+
Years Experience

Professional Experience

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01
Texas Capital
Software Developer
Jul 2024 — Present
98% MatchDallas, TX
  • Owned FedNow instant-payments end to end — onboarded 8 client banks in six months
  • Idempotent settlement: Kafka + Redis dedup + PostgreSQL advisory locks at 300K daily txns
  • Cut p95 latency 340ms → 220ms by diagnosing HikariCP pool saturation
JavaSpring BootKafkaPostgreSQLRedisAWSFedNow
02
PayPal
Software Engineer
Jul 2020 — Jul 2022
96% MatchChennai, India
  • GraphQL BFF aggregation — cut client round trips from 5 to 1 across 200+ markets
  • Kafka-driven dunning scheduler decoupling retry logic from the payment flow
  • Redis FX cache (90%+ hit rate) cut currency conversion from ~200ms to single-digit ms
Node.jsGraphQLApolloKafkaJavaRedisHystrix
03
Anthem
Software Engineer
Feb 2019 — Jun 2020
94% MatchChennai, India
  • Java/Spring Boot enrollment & eligibility APIs handling 15K+ daily calls
  • Composite indexing initiative: 6s slowest query → under 400ms; batch runtime -40%
  • On-call lead: Splunk triage runbook eliminated ~30% of recurring tickets
JavaSpring BootSQLSplunkJenkins

Impact & Results

Numbers don't lie — here's the measurable impact across production systems.

0K
Daily Transactions, Zero Duplicates
Idempotent settlement concurrency — Kafka consumer groups, Redis dedup keys, PostgreSQL advisory locks.
Texas Capital
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TRIPLE-LOCK IDEMPOTENCY
Race risk
Naive setup
→
0
Duplicate postings
Kafka partition key = txn_id ensures duplicate retries land on the same consumer. Redis SETNX provides sub-1ms atomic dedup. PostgreSQL advisory locks prevent concurrent account writes. Protects against duplicate fund movement in a regulated payment environment.
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0
Client Banks Onboarded
Owned FedNow instant-payments integration end to end. Shipped and onboarded within six months.
Texas Capital
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FEDNOW OWNERSHIP
0
Month 0
→
8
Month 6
Authored the technical design: message sequencing, retry semantics, reconciliation. Shipped the service and drove onboarding of 8 commercial banking clients in six months.
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0%
P95 Latency Reduction
Diagnosed HikariCP pool saturation at 200–300 req/s peak. Set pool-tuning standards across 3 services.
Texas Capital
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HIKARICP TUNING
340ms
P95 Before
→
220ms
P95 After
Profiled the regression, identified connection pool saturation as the culprit, tuned pool sizing. Presented findings in a cross-team tech talk that became the standard for pool tuning across three payment services.
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0→1
Round Trips Eliminated
BFF GraphQL aggregation consolidating 5 service calls into one. Co-defined the schema contract with frontend and SDK teams.
PayPal
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BFF AGGREGATION
5 calls
Per render
→
1 call
Per render
Built a Node.js + Apollo Server BFF that consolidated five downstream service calls behind a single GraphQL endpoint. Designed the schema contract jointly with frontend and SDK teams to ensure stable, versioned API surface.
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0s→400ms
Slowest Query Fixed
Systematic indexing initiative across the claims pipeline. Replaced full-table scans with composite indexes.
Anthem / Elevance
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INDEX STRATEGY
6s
Slowest query
→
400ms
Slowest query
Drove a systematic indexing initiative across the claims pipeline, replacing full table scans with composite indexes. Reduced the nightly batch runtime by ~40% and dramatically improved API responsiveness for Blue Cross member enrollment and eligibility queries.
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0%+
FX Cache Hit Rate
Redis-cached FX rates — cut currency conversion latency from ~200ms to single-digit ms.
PayPal
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FX CACHING
~200ms
Conversion lookup
→
<10ms
Conversion lookup
Implemented multi-currency pricing with Redis-cached FX rates backing subscription billing. 90%+ cache hit rate at steady state. Led capacity planning at 2× peak for SE Asia expansion with Hystrix circuit breakers and bulkhead isolation.
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Skill Constellation

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Exploring Kafka ecosystem...
↑ Click any skill to explore its connections
A SUMANTH ORIGINAL PRODUCTION

Featured Projects

Shipped systems, not just side projects. Each one solves a real problem in production — click any card for the full story.

    Tech Stack
    CURRENTLY SHIPPING

    Code, Committed Daily

    Live contribution heatmap from my GitHub. Not claims — real commits, real days.

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    Education

    MASTER OF SCIENCE
    University of Texas at Arlington
    Computer Science
    Aug 2022 — May 2024
    BACHELOR OF TECHNOLOGY
    Jawaharlal Nehru Technological University
    Electronics & Communication Engineering
    India

    READY TO CONNECT?

    Whether it's a challenging backend problem, a cloud migration, or distributed systems — let's talk.

    Email Me LinkedIn Call LeetCode GitHub
    SYSTEM DESIGN · TEXAS CAPITAL BANK

    FedNow Instant Payments Integration

    End-to-end ownership. 300K+ daily transactions. Zero duplicate postings across 8 client banks.

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