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Senior Software Engineer, Full-Stack

at Avantos

New York City, remote, senior, full time, 8+ years

posted 27 May 2026

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  • Golang
  • Next.js
  • Postgres
  • React

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.

What you would do

- 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.

What they are looking for

- 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.

- 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 comes with it

- 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.

Read from jobs.ashbyhq.com, last seen 3d ago.