Senior/Staff Software Engineer, Web Performance

AlphaSense Helsinki; Helsinki; Hybrid; EUR 60 000 - 90 000; Full time

Job summary

A global market intelligence company based in Helsinki is seeking a Senior/Staff Software Engineer to enhance their React-based frontend platform. The role involves improving performance and scalability, collaborating with various teams, and implementing best practices. Flexibility in working arrangements is offered, along with competitive benefits and relocation support.

Benefits

Private healthcare services

Gym room and gaming room access

2 weeks of vacation upfront

Flexible working arrangements

Relocation support

Qualifications

• Advanced knowledge in React performance tuning, avoiding unnecessary re-renders.
• Hands-on experience with large scale frontend codebases and microfrontend architecture.
• Strong background in profiling, debugging, and optimizing codebases at scale.

Responsibilities

• Own and improve performance across the existing React based microfrontend architecture.
• Identify and codify React performance best practices.
• Establish and enforce performance targets and integrate tools into CI/CD pipelines.

Skills

React performance tuning

Microfrontend architecture

Profiling and debugging

Performance regression identification

Tools

Webpack

Sentry

Job description

Overview

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 6,000 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.

Responsibilities

• 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.
• Strong background in profiling, debugging, and optimizing existing codebases at scale.
• 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.
• Private healthcare services from Terveystalo
• 2 weeks of vacation granted up front, and possibility to use vacation days as they accrue
• Access to gym room, gaming room, free parking near the office, mobile phone, lunch benefit, mobile plan, home internet, remote work equipment, and many more....

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

Equal Opportunity 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. We also 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.