Senior Software Engineer, Web Performance

About AlphaSense: 

The world’s most sophisticated companies rely on AlphaSense to remove uncertainty from decision-making. With market intelligence and search built on proven AI, AlphaSense delivers insights that matter from content you can trust. Our universe of public and private content includes equity research, company filings, event transcripts, expert calls, news, trade journals, and clients’ own research content.

The acquisition of Tegus by AlphaSense in 2024 advances our shared mission to empower professionals to make smarter decisions through AI-driven market intelligence. Together, AlphaSense and Tegus will accelerate growth, innovation, and content expansion, with complementary product and content capabilities that enable users to unearth even more comprehensive insights from thousands of content sets. Our platform is trusted by over 4,000 enterprise customers, including a majority of the S&P 500. Founded in 2011, AlphaSense is headquartered in New York City with more than 2,000 employees across the globe and offices in the U.S., U.K., Finland, India, Singapore, Canada, and Ireland. Come join us!

The Role

We're looking for a Senior/Staff Software Engineer to join our Web Infra team and lead efforts to improve the performance, scalability, and reliability of our frontend platform. Our product is built on React with a microfrontend architecture, and this role will focus on evolving the performance posture of an existing production codebase.

You’ll collaborate closely with product teams to proactively identify performance bottlenecks, guide teams through technical tradeoffs, and implement strategies that result in faster, more resilient user experiences across our application.

What you’ll do

• Own and improve performance across the existing React based microfrontend architecture and product features
• Identify and codify React performance best practices, architectural trade offs, and code level improvements in the existing codebase.
• Establish and enforce performance targets for LCP, INP, FCP etc. and integrate tools like Lighthouse CI, Sentry Performance into CI/CD pipelines.
• Collaborate with product teams to analyze the performance patterns and practices impact of new features and help define fast-by-default development patterns.
• Partner with designers and product managers to define performance SLAs and ensure UX remains performant under real world conditions.
• Profile and diagnose runtime issues (e.g. slow interactions, re-renders, memory leaks) using Chrome DevTools, React Profiler, and telemetry.
• Work across teams to reduce bundle sizes, optimize resource loading (code splitting, preloading, lazy loading), and optimize caching strategy.

Required Skills & Experience

• Advanced knowledge of React performance tuning: avoiding unnecessary re-renders, memoization etc.
• Hands-on experience working with large scale frontend codebases, microfrontend architecture, and Webpack module federation.
• Deep understanding of the browser rendering lifecycle, JavaScript execution, layout/paint/composite phases, and async scheduling.
• Strong background in profiling, debugging, and optimizing existing codebases at scale.
• Proficiency in modern JavaScript, TypeScript, and modern build tools like Webpack, Rollup, Vite, etc.
• Familiarity with monitoring and observability stacks like Sentry, or custom telemetry pipelines.
• Experience identifying performance regressions early and building guardrails via CI, testing, and automation.

Nice to Have

• Experience with SSR/CSR, related performance optimizations, streaming rendering, and hydration techniques.
• Familiarity with PWAs, service workers, and advanced caching/CDN strategies.
• Prior involvement in performance-focused technical initiatives across multiple teams and experience working in a platform team

What we Offer

• Playing a part in the story of a fast growing company
• Interesting career opportunities and training
• Relocation support for single employees, couples and families
• While we do have an office in Helsinki, we’re a distributed company. We value outcomes over time, and offer flexible working arrangements. We usually meet at the office once a week.

You can apply by sending your cover letter and resume through the application form.

AlphaSense is an equal-opportunity employer. We are committed to a work environment that supports, inspires, and respects all individuals. All employees share in the responsibility for fulfilling AlphaSense’s commitment to equal employment opportunity. AlphaSense does not discriminate against any employee or applicant on the basis of race, color, sex (including pregnancy), national origin, age, religion, marital status, sexual orientation, gender identity, gender expression, military or veteran status, disability, or any other non-merit factor. This policy applies to every aspect of employment at AlphaSense, including recruitment, hiring, training, advancement, and termination.

In addition, it is the policy of AlphaSense to provide reasonable accommodation to qualified employees who have protected disabilities to the extent required by applicable laws, regulations, and ordinances where a particular employee works.

Recruiting Scams and Fraud

We at AlphaSense have been made aware of fraudulent job postings and individuals impersonating AlphaSense recruiters. These scams may involve fake job offers, requests for sensitive personal information, or demands for payment. Please note:

• AlphaSense never asks candidates to pay for job applications, equipment, or training.
• All official communications will come from an @alpha-sense.com email address.
• If you’re unsure about a job posting or recruiter, verify it on our Careers page.

If you believe you’ve been targeted by a scam or have any doubts regarding the authenticity of any job listing purportedly from or on behalf of AlphaSense please contact us. Your security and trust matter to us.