Role fit
Lead Frontend Engineer, Frontend Architect or Staff-level product engineer.
Available for a senior / lead frontend role
Frontend architect & product-minded engineer
Rajat Malik
I am Developer
I turn complex enterprise problems into fast, accessible products people actually enjoy using — and I lead the teams that ship them.
- Email mr.rajatmalik@gmail.com
- Phone +91 800-387-4742
- LinkedIn in/errajatmalik
- GitHub malikrajat
- WhatsApp +91 800-387-4742
- Resume PDF download
Core stack
- Angular
- React
- TypeScript
- JavaScript (ES6+)
- RxJS & NgRx
- Redux
- Micro-Frontends
- Next.js
- Node.js
- Nx
- Design Systems
- Jest / Playwright
- Core Web Vitals
- WCAG 2.2 / ARIA
- Docker & CI/CD
- AI-assisted delivery
6+years at
Siemens
Siemens
15+years shipping
digital products
digital products
47%performance
improvement
improvement
30+open-source
projects
projects
About
Senior Lead Software Engineer at Siemens | Frontend Architect & Engineering Lead | Angular, React & Micro-Frontends | Creator of 30+ Open-Source Libraries & ToolsI am a frontend architect and lead engineer with 15+ years of building large-scale web products for enterprise, energy, telecom and fintech teams — the last 6+ years at Siemens, and before that at HCL and Siemens Energy. I own the technical direction — architecture, performance, accessibility, testing and release quality — and I stay hands-on in the code that delivers it. My work tends to land in three places: modernising legacy Angular and React platforms without stalling delivery, setting up design systems and micro-frontend boundaries so teams can ship independently, and lifting Core Web Vitals on products where speed directly affects revenue and retention.
Frontend Architect & Engineering Lead
I lead frontend delivery end to end: architecture and technical direction, mentoring and code review, performance and accessibility standards, and the testing discipline that keeps releases predictable. At Siemens I led the redesign of a major energy automation platform, delivering a 47% boost in performance and a 32% increase in customer acquisition, and I have since applied the same approach across eCommerce, telecom and finance products — modernising interfaces, removing runtime bottlenecks, and raising release quality without slowing the roadmap.
- Current role: Senior Lead Software Engineer
- Current Company: Siemens (2020 – Present)
- Experience: 15+ years total
- Phone: +91 80-0387-4742
- WhatsApp: Chat on WhatsApp
- Subscribe to The Angular Insider
- Degree: B.Tech in Computer Science Engineering
- Email: mr.rajatmalik@gmail.com
- LinkedIn: in/errajatmalik
- GitHub: github.com/malikrajat
- City: Gurgaon, IN
- Status: Open to a senior / lead frontend role
- Newsletter: The Angular Insider
What I am looking for next: a senior or lead frontend role at a new company, where engineering quality
and delivery speed genuinely matter and the team values clear technical direction. I am happy to talk
to any company hiring for that — and to be straightforward about fit on both sides.
If that sounds like the kind of problem you are sitting on, send me the short version and I will tell
you how I would approach it.
Companies & Clients
The organisations behind the work — currently Siemens, with earlier roles across Siemens Energy, Siemens Mobility and HCL, and client programmes including AT&T, Airtel, GIPL, RMG Worldwide and AllCAD Services — spanning energy automation, energy transmission, mobility, telecom, courier, cargo and engineering software.
Company names and marks belong to their respective owners and are shown here only to identify the organisations I have worked with.
Recruiter brief
Senior frontend leadership, with product outcomes to prove it.
I help teams that need a stronger, faster, more maintainable web product — owning the technical direction and staying hands-on through production delivery. I am currently at Siemens and open to the right role at any company.
Core stack
Angular, React, TypeScript, design systems and micro-frontends.
Currently at
Senior Lead Software Engineer at Siemens for 6+ years — previously Siemens Energy and HCL.
Open to
Full-time senior and lead frontend roles at any company — remote, hybrid or on-site.
Skills
Angular and React at depth, TypeScript everywhere, and the engineering practices that keep large codebases healthy: architecture and module boundaries, design systems, performance budgets, accessibility, testing and release quality. I am equally comfortable setting technical direction, reviewing and mentoring, and shipping the critical path myself.
Languages & Fundamentals
TypeScript 95%
JavaScript (ES6+) 95%
HTML5 & semantic markup 95%
CSS3, Sass, Tailwind & Bootstrap 92%
RxJS & reactive programming 90%
Web APIs (IndexedDB, Storage, Workers) 88%
Frameworks & UI
Angular (v2 to latest, incl. signals) 95%
React (16 to 19, hooks & concurrent) 92%
Next.js & SSR / SSG 82%
React Native 80%
Vue.js 75%
Angular Material, Bootstrap & PrimeNG 90%
Design systems & component libraries 90%
Architecture & Quality
Micro-frontends & module federation 92%
State management (NgRx, Redux, Signals) 92%
Web performance & Core Web Vitals 92%
Accessibility (WCAG 2.2, ARIA) 88%
Unit testing (Jest, Jasmine, Vitest) 90%
E2E testing (Playwright, Cypress) 85%
Web security (OWASP, CSP, XSS) 85%
Delivery, Tooling & AI
Technical leadership & mentoring 92%
CI/CD (GitHub Actions, Jenkins) 85%
Build tooling (Nx, Vite, Webpack) 88%
Git workflows & code review 92%
Docker & cloud-native delivery 82%
NPM package authoring & publishing 92%
AI-assisted development (Copilot, LLM APIs) 90%
Technical credibility
Engineering systems, not just screens.
Senior-level frontend decisions that improve product quality, team velocity and long-term maintainability — the work behind the numbers on this page.
Scalable architecture
Micro-frontends, modular boundaries, and backend-driven patterns built for independent delivery.
Web performance
Core Web Vitals, profiling, lazy loading, and rendering strategy that make products feel fast.
Accessible by design
Inclusive, responsive interfaces with accessibility considered from component design through release.
Quality engineering
Pragmatic unit, integration, and end-to-end testing strategies that reduce release risk.
Design systems
Reusable UI foundations that bring visual consistency, accessibility, and speed to product teams.
AI-enabled delivery
Thoughtful use of AI tools to prototype, automate repetitive work, and accelerate well-engineered outcomes.
Resume
15+ years of frontend engineering, the last 6+ of them at Siemens leading delivery and architecture on enterprise energy automation products, and before that at Siemens Energy and HCL across telecom, eCommerce and finance. Recent highlights include migrating legacy Angular codebases to modern Angular and React for up to 40% better performance and developer productivity, lifting a production Lighthouse score from 20 to 97, and building the testing and review practices that cut release-time defects. The full timeline is below, and the PDF resume is available to download.
Summary
Rajat Malik
Senior Lead Software Engineer at Siemens | Frontend Architect & Engineering Lead | Angular,
React & Micro-Frontends | Creator of 30+ Open-Source Libraries, Extensions & Tools
Frontend architect and lead engineer with 15+ years building large-scale web products for enterprise,
energy, telecom and fintech teams — the last 6+ years at Siemens, following earlier roles at
Siemens Energy and HCL. I set the technical direction — architecture, performance,
accessibility, testing and release quality — and stay hands-on in the code that delivers it.
Recent work includes migrating legacy Angular codebases to modern Angular and React for up to 40%
better performance and developer productivity, lifting a production Lighthouse score from 20 to 97,
and introducing the review and testing practices that measurably cut release-time defects.
I also use AI tooling such as GitHub Copilot deliberately, to prototype faster and remove repetitive
work without lowering engineering standards.
- A808 M3M Golf Estate, Gurgaon, Haryana 122102
- +91-80-0387-4742
- mr.rajatmalik@gmail.com
- linkedin.com/in/errajatmalik
- github.com/malikrajat
Education
Bachelor of Engineering & Computer Science and Engineering
2007 - 2012
Ajmer Institute of Technology, Rajasthan, India
During my undergraduate studies, I developed a strong foundation in computer science and engineering principles. I gained practical experience in programming, algorithms, and system design, which shaped my problem-solving abilities and analytical thinking. These years were instrumental in fostering my passion for technology and laying the groundwork for a successful career in software development.
Professional Experience
Senior Lead Software Engineer — Siemens
2020 - Present (6+ years)
Siemens · Energy automation & enterprise platforms · Gurgaon, Haryana, India
Current employer. I lead frontend architecture and delivery for enterprise energy automation products, owning technical direction while staying hands-on in the critical path.
- Spearheaded the migration of Angular legacy codebases to modern Angular and React, resulting in up to 40% improvement in performance and developer productivity and scalability.
- Raised the production Lighthouse performance score from 20 to 97 through rendering, bundle and asset-delivery optimisation.
- Improved Core Web Vitals (LCP, FID, CLS) by 80%, resulting in an improved user experience.
- Reduced runtime performance bottlenecks by 48% via proactive memory leak and security resolution and deep performance profiling.
- Implemented a Backend-Driven Architecture, resulting in a 13% reduction in development effort and improved efficiency in project delivery.
- Achieved 90% unit test coverage using the Jest framework and implemented an automated testing pipeline for early feedback.
- Libraries like Material, Bootstrap, NG Prime, Plotly, chartjs & more for fast, interactive and responsive UI development along with very rich, interactive charts to give secure, fast & better end user experience.
- Contributed in code reviews and suggested ways to improve code quality and performance that reduce bug, development time by 10%.
- Led cross-functional teams to design and implement micro-frontend architectures that reduced deployment overhead and enabled independent module releases.
- Achieved a 63% reduction in release-time bugs by enhancing the robustness of the testing approach.
-
I have earned multiple awards. They are listed below.
- 1. Stellar Award
- 2. Star Performer
Senior Software Engineer — Siemens Energy
Earlier
Siemens Energy · Energy transmission & grid products
- Built and maintained Angular and React frontends for energy transmission and monitoring products, working directly with engineering and domain teams.
- Delivered data-heavy, real-time interfaces for operational users, with a focus on rendering performance, reliability and clarity under load.
- Established component reuse and testing practices that carried forward into later platform work.
Software Engineer — HCL
Earlier
HCL · Enterprise and telecom client programmes
- Delivered frontend features for enterprise and telecom client engagements, from requirement clarification through production release.
- Worked across the JavaScript ecosystem with early Angular versions, building the fundamentals in component design, state handling and cross-browser delivery.
- Collaborated with distributed QA, backend and client stakeholders on release cycles and defect reduction.
Technical Talks
I speak at internal engineering forums, meetups and conferences on frontend architecture, performance and modern web tooling — the same topics I work on day to day, translated into practical takeaways teams can apply the following week.
Modern Web Performance Optimization Techniques
A deep dive into advanced techniques for optimizing web applications, covering lazy loading, code splitting, and modern performance metrics.
Building Scalable Frontend Architectures
Sharing insights on designing and implementing scalable frontend architectures using micro-frontends and modern frameworks.
Angular Performance Mastery
A comprehensive workshop on optimizing Angular applications, covering change detection, lazy loading, and state management.
Interested in having me speak at your event? Contact me for speaking opportunities!
Get in TouchLibraries & Tools
Alongside client work I design, build and publish my own developer tooling — thirty-three open-source projects shipped so far, spanning eighteen npm packages, three Chrome extensions, two VS Code extensions and two cross-platform desktop applications, covering UI components, PDF and export engines, device detection, notifications, layout rendering, dev tooling and personal branding. Every release is engineered with the same standards I apply to production products: zero or minimal dependencies, tree-shakable and SSR-safe APIs, full TypeScript typings, accessibility and performance budgets, and semantic, well-tested release pipelines. The goal is simple — replace repetitive, error-prone work with focused utilities that teams can adopt in minutes and rely on for years. Browse by category below to explore the libraries, extensions and applications.
- All
- Chrome Extension
- VS Code Extension
- Desktop Apps
- NPM Libraries
Portfolio
Selected product work from 15+ years of frontend delivery — enterprise platforms, telecom and energy systems, and the modernization programmes behind them. Each entry lists the problem, what I owned, and the measurable outcome, so you can judge the work rather than the wording.
- All
- Energy
- Partial
- Telecom
- Software
- Mobility
Writing
Writing is how I keep my thinking sharp and give back to the community. I publish 150+ technical articles across twelve platforms — long-form architecture and performance deep dives, plus short-form notes on the tools and patterns I use daily. Follow whichever channel suits you.
Articles On Medium
Long-form articles, deep-dives and technical write-ups on frontend engineering.
Articles On Substack
Weekly frontend stories and curated resources, straight to your inbox.
Articles On Dev.to
Free long-form content and deep-dives for the developer community.
Articles On Hashnode
Developer blog posts and technical discussions on modern web development.
Articles On LinkedIn
Let us connect professionally and follow my latest posts and articles.
Newsletter On LinkedIn
The Angular Insider — subscribe for weekly Angular and frontend engineering insights.
Articles On Threads
Short-form frontend insights, tips and quick experiments.
Articles On X (Twitter)
Developer banter, code snippets and day-to-day engineering notes.
Articles On BlueSky
Stay up to date on frontend trends and everything happening in the ecosystem.
Articles On GitHub
Explore my open-source projects and see the code in action.
Articles On Reddit
Developer blog posts, discussions and community Q and A.
Articles On Website
Everything in one place — portfolio, libraries, talks and writing.
Articles On Portfolio
Projects, talks and recognitions collected in one portfolio.
Testimonials
Feedback from engineering managers, product owners and clients I have worked with — on technical leadership, delivery reliability and the quality of what actually shipped.
What truly sets Rajat apart is his innovative problem-solving mindset. He fearlessly tackles complex challenges head-on, demonstrating a remarkable ability to devise creative solutions. As an idea-bringer, Rajat consistently injects fresh perspectives into our discussions, leading to the development of outstanding solutions. His entrepreneurial spirit, coupled with a deep understanding of business dynamics and a resolutely customer-centric mindset, has significantly contributed to our team's achievements. Even in challenging circumstances,Rajat remains remarkably calm and dependable.
Thomas Kocher
Product Manager
I had the pleasure of working with Rajat on a UI/UX project at Siemens for three quarters. Rajat's ability to excel in multiple roles (Lead, Architect, Developer) while meeting tight deadlines is truly unmatched. His exceptional leadership significantly boosted the team’s productivity, constantly motivating everyone to deliver even under intense pressure. Rajat consistently tackles complex challenges with unwavering dedication, ensuring the team stays inspired and on track. Not only is he a talented professional but also an exceptional team player. With his belief that "nothing is impossible," Rajat is a unique and invaluable asset to any organization.
Suraj Vernekar
Product Owner
Rajat is one of the most mature and bright team members I have ever come across. His expertise spans frontend development, JavaScript, React, Angular, performance optimization, and micro-frontends. Prioritizing work by assessing business impact and working within a lean product development strategy is something anyone can learn from him. Rajat is kind-hearted, with a pleasant personality and the rare ability to stay focused in every situation. I recall our discussions on advanced web development, application optimization, micro-frontends, and unit testing. Rajat is an outstanding, no-nonsense professional and a valuable colleague.
Pankaj Arora
Product Manager
Rajat was one of my star performers on the project. His agility and speed helped us complete a significant number of deliverables well ahead of time, thus providing ample time for testing and improving the overall quality of the project. He works exceptionally well with the team and brings an immense amount of energy, which fosters a great working environment. Rajat was an invaluable asset, and I hope he continues to shine as a top performer. Thanks, Rajat, for your unwavering dedication and commitment. It was an absolute pleasure managing someone like you. Wishing you all the best in your future endeavors.
Ruchika Mahajan
Project Manager
Selected impact
Work that moves the numbers.
Three engagements that show how I work and what changed: the problem, the approach, and the measured result.
Energy automation
Rebuilt a critical product experience for speed and adoption.
Led a performance-focused redesign that improved the product experience for enterprise users.
- 47% performance improvement
- 32% increase in customer acquisition
Telecom platforms
Scaled frontend delivery across complex, business-critical systems.
Applied modular architecture, performance profiling, and reliable testing practices.
- 48% fewer runtime bottlenecks
- 63% fewer release-time bugs
Product modernization
Modernized legacy interfaces without sacrificing delivery speed.
Guided Angular and React migrations that made products easier to maintain and evolve.
- 40% improvement in delivery performance
- 90% unit-test coverage achieved
Why hire me
The direction, the delivery and the proof behind it.
I am looking for my next role at a company that values engineering quality. This is the work I do best, and the kind of problem I would take on from day one.
Frontend
architecturePlatform and module boundaries that teams can ship independently.Web performanceCore Web Vitals and product
responsiveness, measured before and after.Design systemsScalable,
accessible interface foundations.ModernizationMoving legacy
Angular or React applications forward safely.
Next role
Looking for a senior or lead frontend role.
Tell me about the team and the product. I will come back with a straight answer: whether I am the right fit, how I would approach it, and what it would take.
Contact Me
Hiring for a senior frontend role, or need help with an architecture, performance or modernization problem? Reach me on whichever channel suits you — email, phone, WhatsApp, LinkedIn or GitHub — or send a short brief below and I will reply with a clear next step, usually within one business day.
Address
A808 M3M Golf Estate, Gurgaon, Haryana 122102
Call or WhatsApp
GitHub
Email Me
Response Time
I read every message personally and usually reply within one business day, including a short note on how I would approach your problem.