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Senior front-end engineer with 16+ years across fintech, healthcare, and government-facing SaaS. Proven measurable impact: 13.5% faster page loads, 16.7% smaller bundles, and closing critical payment/XSS vulnerabilities before production. Owns a customer-facing portal for Maryland’s tolling authority (2.44M registered accounts, 140.3M annual toll transactions), driving modernization (RxJS → Signals) and AI-augmented workflows. Previously led performance, security, and platform migrations across large UK/IE networks and production systems. Strong expertise in React/Angular, SSR/hydration, state management (RxJS/NgRx), and secure API-driven platforms, with a focus on measurable outcomes and stable releases.…Senior front-end engineer with 16+ years across fintech, healthcare, and government-facing SaaS. Proven measurable impact: 13.5% faster page loads, 16.7% smaller bundles, and closing critical payment/XSS vulnerabilities before production. Owns a customer-facing portal for Maryland’s tolling authority (2.44M registered accounts, 140.3M annual toll transactions), driving modernization (RxJS → Signals) and AI-augmented workflows. Previously led performance, security, and platform migrations across large UK/IE networks and production systems. Strong expertise in React/Angular, SSR/hydration, state management (RxJS/NgRx), and secure API-driven platforms, with a focus on measurable outcomes and stable releases.

Kirill Nikiforov

Front-End Developer, Web Developer, Software Engineer, +2

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Senior front-end engineer with 16+ years across fintech, healthcare, and government-facing SaaS. Proven measurable impact: 13.5% faster page loads, 16.7% smaller bundles, and closing critical payment/XSS vulnerabilities before production. Owns a customer-facing portal for Maryland’s tolling authority (2.44M registered accounts, 140.3M annual toll transactions), driving modernization (RxJS → Signals) and AI-augmented workflows. Previously led performance, security, and platform migrations across large UK/IE networks and production systems. Strong expertise in React/Angular, SSR/hydration, state management (RxJS/NgRx), and secure API-driven platforms, with a focus on measurable outcomes and stable releases.…Senior front-end engineer with 16+ years across fintech, healthcare, and government-facing SaaS. Proven measurable impact: 13.5% faster page loads, 16.7% smaller bundles, and closing critical payment/XSS vulnerabilities before production. Owns a customer-facing portal for Maryland’s tolling authority (2.44M registered accounts, 140.3M annual toll transactions), driving modernization (RxJS → Signals) and AI-augmented workflows. Previously led performance, security, and platform migrations across large UK/IE networks and production systems. Strong expertise in React/Angular, SSR/hydration, state management (RxJS/NgRx), and secure API-driven platforms, with a focus on measurable outcomes and stable releases.

Available to hire

Senior front-end engineer with 16+ years across fintech, healthcare, and government-facing SaaS. Proven measurable impact: 13.5% faster page loads, 16.7% smaller bundles, and closing critical payment/XSS vulnerabilities before production. Owns a customer-facing portal for Maryland’s tolling authority (2.44M registered accounts, 140.3M annual toll transactions), driving modernization (RxJS → Signals) and AI-augmented workflows.

Previously led performance, security, and platform migrations across large UK/IE networks and production systems. Strong expertise in React/Angular, SSR/hydration, state management (RxJS/NgRx), and secure API-driven platforms, with a focus on measurable outcomes and stable releases.

Skills

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Expert

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Intermediate

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Intermediate

Work Experience

Senior Frontend Engineer / Architect at TransCore Inc.

September 1, 2024 - Present

Owned the customer-facing portal (B2C + B2B) for Maryland’s tolling authority (MDTA): account management, toll payments, transactions, and vehicle/transponder management. Architected a fail-fast fraud-prevention pipeline (IP → email → phone) integrating TransUnion risk APIs and 24/7 2-hour velocity checks, reducing fraudulent accounts by ~2,900. Shipped Google Pay and Apple Pay web-based flows across desktop/tablet/mobile browsers via the Card Connect gateway (QR fallback for non-Apple devices), adopted by 11,000+ users. Led staging performance remediation (HTTP/2, compression, minification), then directed a phase-2 RxJS → Angular Signals migration to reduce change-detection overhead and improve page-load speed by 13.5%. Introduced AI-assisted code review via CodeRabbit to reduce PR review time for large PRs across multiple engineers. Guided release architecture decisions with MDTA stakeholders, blocking unstable requirements before release.

Senior Frontend Engineer at Veterinary Pathology Group PLC

August 1, 2021 - September 1, 2024

Delivered an online diagnostic ordering and results portal for veterinary clinicians: test ordering, sample submission management, live lab status tracking, and patient results history. Reduced production JavaScript bundle size by 16.7% across the UK & Ireland’s largest veterinary lab network through bundle analysis and code-splitting. Migrated ASP.NET Core service/runtime from .NET Core 2.1 (EOL) to .NET 6 (LTS) across 30+ files without breaking API contracts. Prototyped and pitched a React Native mobile app end-to-end proof of concept to obtain stakeholder buy-in. Built an interaction-heavy clinical UI (animated result timelines and real-time lab status updates) on Angular Universal with SSR and hydration.

Senior Frontend Engineer / Team Lead at SmartLinx Inc.

July 1, 2017 - June 30, 2021

Worked on cloud workforce management and HR platform used by 5,000+ senior-care and post-acute healthcare facilities: scheduling, time & attendance, payroll, analytics, and compliance. Diagnosed and fixed a critical memory leak in the scheduling grid affecting 800+ facilities, preventing browser crashes on high-volume shifts. Resolved infinite-scroll performance failures freezing the browser past ~15 pages by building a custom virtual scroll; later migrated to Angular CDK’s virtual scroll viewport. Led a team for ~1 year, mentoring and onboarding 8 engineers through structured code review practices.

Senior Frontend Developer at Ingram Micro Cloud Inc.

November 1, 2016 - July 1, 2017

Contributed to a cloud marketplace connecting buyers and sellers through a single portal for 1,700+ global software vendors, supporting reseller purchasing, provisioning, management, and invoicing of cloud solutions. Improved main-page load speed by 15% and reduced render time by 1.9s on a high-traffic commercial portal. Detected and patched an XSS vulnerability in the HTML editor to remove a live security risk. Built a custom UI test-report generator for a 12-developer team, replacing manual report compilation.

Frontend Developer at COX Inc.

September 1, 2013 - November 1, 2016

Developed an early-stage fintech social network built on mutual investment funds (PIFs), where users deposit funds, buy fund units, become unit-holders, trade units with peers, and message each other. Designed a Storybook-documented component library adopted by 25+ engineers to standardize UI across the product. Built a reusable application-wide audio/video player component used throughout the product.