Senior Software Engineer, Full-Stack

Avantos, Inc

$130K — $180K *
Information Technology
8 - 10 years of experience
Job Overview by Ladders

Qualifications

  • 8+ years of engineering experience building production web applications.
  • Expert-level React and Next.js mastery, including streaming and modern rendering patterns.
  • Proven design capability for high-performance, scalable frontend systems.
  • Solid backend competency, ideally with Golang and strong API design fluency.
  • Deep understanding of performance optimization strategies, including caching and code splitting.
  • Product and architecture mindset with a focus on strategic build decisions.

Responsibilities

  • Lead frontend architecture and design for React/Next.js interfaces with emphasis on performance and UX.
  • Integrate with backend services and contribute to Golang API development.
  • Collaborate closely with product and design teams to inform experience decisions.
  • Influence architectural strategies and engineering standards for reliability and performance.
  • Write high-quality, clean code and enforce coding standards through reviews.
  • Mentor junior engineers and act as a technical force multiplier to elevate team performance.

Benefits

  • Competitive compensation and equity options.
  • Opportunity to shape the technical foundation of a new AI platform.
  • Culture that prioritizes engineering excellence, focus, and ownership over mere task completion.
Full Job Description
About the Role

We're looking for a Senior Full Stack Engineer with a strong frontend core - someone who thinks in React/Next.js first, but is fully capable of contributing at the backend layer using Golang when needed.

Responsibilities
  • Lead frontend architecture and experience design - owning React/Next.js interfaces end-to-end, with a focus on performance, UX, and scalability.
  • Integrate cleanly with backend services and contribute to Golang APIs when needed - not just consume them.
  • Collaborate tightly with product and design on experience decisions - not just implementation.
  • Influence architecture, reliability, performance strategy, and engineering standards.
  • Write high-quality, clean, well-structured code - and enforce that quality in reviews.
  • Act as a technical force multiplier - mentoring, unblocking, and setting the technical bar.

Minimum Qualifications
  • 8+ years of engineering experience building production web applications.
  • Expert-level frontend depth - React + Next.js mastery (streaming, modern rendering patterns, state strategy).
  • Proven ability to design high-performance, scalable, modern frontend systems with clarity and intentionality.
  • Solid backend competency - ideally Golang, but strong API design fluency is required.
  • Deep understanding of performance, caching, hydration, code splitting, bundling, deploy strategy, DX/UX tradeoffs.
  • Product and architecture instincts - you care about what should be built, not just how.


Preferred Qualifications
  • AI, fintech, or data-intensive product experience.
  • Experience shaping design systems, frontend platforms, or reusable architecture patterns.
  • Edge rendering, observability tooling, or event-driven architecture familiarity.
  • Experience with relational databases (Postgres)


What We Offer
  • Competitive compensation + meaningful equity.
  • Opportunity to define the technical foundation of a greenfield AI platform.
  • A culture optimized for engineering excellence, focus, deep work, and ownership - not ticket factories.

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