Senior Software Engineer, Full-Stack
at Avantos
New York City, remote, senior, full time, 8+ years
posted 27 May 2026
- 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.