Principal Software Engineer

Join a dynamic team at the pulse of global markets, where we deliver innovative software and service solutions for essential financial reporting and capital markets transactions. At DFIN, we are a values-driven organization that empowers you to build a fulfilling career while bringing your authentic self to work every day. Our "Win as One" mentality ensures that our team's success is directly linked to Client, Shareholder and Employee Satisfaction.
In 2026, DFIN was named #1 on the 2026 Top 100 Global Most Loved Workplaces® by Best Practice Institute. We have also been recognized as one of America's Most Loved Workplaces® for five consecutive years and a Built In Best Place to Work for six years, reflecting our continued commitment to supporting employees' total well-being. Enjoy competitive compensation, a flexible workplace, comprehensive benefits, and opportunities for professional growth. Bring your passion and talents to DFIN - because being YOU thrives here.
Summary:
We are looking for technical team members at all levels who want to push themselves to deliver best in market SaaS solutions. We offer a challenging environment where you will have to grow, adapt, and use your skills consistently. Our customers rely on us in the moments that matter. Engineering delivers on that promise.
As a Principal Frontend Engineer, you will be part of key engineering team within our engineering organization, responsible for the architectural vision, design, and implementation of our frontend systems. You will work closely with cross-functional teams, engineers at all levels, product managers, and UX designers, to deliver a world-class user experience for our SaaS platform. This role requires deep engineering skills in modern front-end technologies, strong collaboration skills, and a strategic mindset to drive the evolution of our systems in alignment with business goals.
This isn't your typical, boring, web application, but a highly sophisticated, modern, SPA plus Node JS BFF, that pushes the boundaries of memory and computation in a browser requiring many components to be meticulously engineered for optimal performance. Challenges include the use of web workers, algorithmic design/optimization, replication patterns, caching, async design, and the successful management of complexity. The system involves real-time collaborative document editing, requiring concurrency and distributed systems thinking. This role focuses on the most advanced and challenging aspects of this system in an environment of innovation and technical excellence.
Responsibilities:
• Complex web frontend SPA development and architecture.
• Design and implement concise, modular, cohesive, frontend and backend services in a distributed system context that are resilient, efficient, and reliable.
• Ensure automated tests are highly effective in terms of software quality, refactor flexibility, and integration/delivery/build speed.
• Design, refactor, implement, or work within micro-frontend SPA(s).
• Optimize builds for speed and deterministic dependency management.
• Concurrent and asynchronous software design/development.
• Advanced asynchronous and resilient network communications design and implementation.
• Software development on complex, but potentially irreducible algorithms or combinatorials.
• Understand the basics of determinism, complexity classes, and resource constraints.
• Find ways to reduce/decompose complex software components along appropriate boundaries.
• When apparently irreducible problems are encountered and they resist beneficial decomposition (np-ness), find ways to simplify through approximation theory and quantization.
• Extensive usage of all aspects of observability systems from experienced instrumentation of code to well-designed queries, dashboards, and alerts.
Additional Responsibilities
• Data driven optimization of latency, compute, memory, storage, and network traffic.
• Maintain awareness of production system performance, errors, and code usage.
• Communicate with clarity with diagrams, documentation, and presentations to other developers, dev teams, SREs, and management.
• Optimize build, deployment, and IaC provisioning pipelines.
• Rigorous analysis of escaped defects to determine corrective actions with depth of insight.
• Communicate clearly via software architecture, embedded docs, or o11y.
• Design and develop defensively to maintain or increase security going beyond OWASP and zero trust patterns by truly understanding the area of the system being worked on.
• Rigorous and proficient review and clear feedback on pull requests by team members.
• Keep up with relevant technologies, techniques, tools, and patterns.
• Ensure the software is as simple as possible, but not simpler.
• Build software with people. Product managers, other developers, SREs, junior engineers, senior engineers, and offshore. Construct software that matters!
• Constantly address technical debt. Shine a light on it, even when it hurts.
• Participate in the planning of technical engineering and product roadmaps.
• Plan, lead, or manage projects when called upon to do so while remaining hands on.
Qualifications:

• • 6-15+ years of experience designing and building frontend software applications
  • Experience with secure coding standards and participation in systems security practices.
  • Ability to explain complex topics to managers/directors, program/product managers
  • Non-negotiables
  o Strong Typescript/JavaScript/ECMAScript
  o REACT (preferred), Angular, or other SPA frontend development tech stack
  • Roughly 50% or more of the following
  o Experience with heavy, complex frontend software.
  o Redux/Redux-Saga
  o Browser APIs
  o JS immutable data structures
  o In depth REST, gRPC, graphQL, or other API experience
  o Frontend test frameworks
  o Concurrency and/or asynchronous operations
  o Algorithm and combinatorial design and optimization
  o Performance and memory profiling/optimization including binary/byte level techniques
  o Javascript V8 Engine knowledge/experience
  o C# .NET or Java Spring boot backend service experience
  o Node JS
  o Micro-frontends
  o WebSockets or other push technologies like Signal R or long polling
  o Browser Canvas
  o Advanced HTTP protocol/Networking
  o RDMS/database design and development experience PostgreSQL, SQL Server
  o Docker, AKS/Kubernetes
  o Distributed systems backend or P2P systems experience
  Education
  • BS in Computer Science or equivalent work experience.

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