Senior Software Engineer

Job description

Join KYXStart — the trust infrastructure for a world where humans, AI agents, and businesses transact continuously, autonomously, and globally. KYXStart provides a unified, Real-time Identity \& Payments Verification Platform helping banks, fintechs, and merchants verify consumers and businesses instantly. We’re growing fast and looking for a Senior Software Engineer who excels in fast-moving, mission-driven environments and enjoys shaping both architecture and scale platform to products globally. As an early member of our core team, you’ll work closely with the CTO, product, and engineering leadership .

**Location:** Remote (US or Canada).

What You’ll Do in this Role

In this role, you’ll own major parts of our platform—designing secure systems, building scalable services, and setting engineering standards across the stack.

You’ll work closely with product, design, DevOps, and ML teams as you contribute to a high-impact, security-focused platform trusted by businesses and biggest brands worldwide.

This position is ideal for someone who combines deep technical ability with strong product intuition, a security-first mindset, and a passion for building reliable systems end-to-end.

What You'll Do

Platform \& Full-Stack Engineering

Architect, build, and scale secure backend services using NestJS, TypeScript, and Prisma

Develop highly performant, resilient UIs with React

Design and maintain secure, well-structured APIs and data access layers for sensitive PII/PHI

Work with PostgreSQL (Aurora), JSONB, and hybrid relational models

Leverage Redis and OpenSearch for caching, search, and analytics workloads

Lead efforts to improve performance, reliability, and observability across the system

Security, Privacy \& Compliance Mindset

Champion secure coding and least-privilege design across services and infrastructure

Proactively monitor CVEs, manage dependencies, and strengthen infrastructure posture

Participate in and help lead threat modeling, risk assessments, and incident response readiness

Contribute to compliance-oriented engineering practices (SOC 2, HIPAA, PCI, etc.)

Hand-on and drive architectural discussions and influence long-term technical direction

Conduct thoughtful code reviews and mentor other engineers

Partner closely with product, design, and ML teams to define scope, deliverables, and tradeoffs

Build internal tools, automation, CI/CD workflows, and developer experience improvements

Help evolve engineering best practices, documentation, and operational maturity

Who You Are

5+ years of professional experience in full-stack or backend engineering

Strong expertise with JavaScript/TypeScript, NestJS, React, and API development

Deep understanding of PostgreSQL, JSONB, indexing, and performance tuning

Experience working with AWS, ideally EKS, Aurora, Lambda, IAM, and cloud networking

Familiar with Python for scripting or machine learning integration

Strong appreciation for application and cloud security—you think like an attacker and build like a guardian

Experience working in identity, fintech, healthtech, or regulated environments is a plus

Comfortable owning large features independently and influencing architecture-level decisions

What Excites You

Solving high impact business and complex engineering challenges involving identity, PII protection, and hyper-scalable distributed systems

Writing code that stands up under real-world usage, audits, and compliance requirements

Working in a high-trust, high-velocity environment where your contributions matter

Collaborating with cross-functional teams—product, design, ML, and security

Leading and owning products end-to-end, from design to deployment to monitoring

Eligiblity

Applicants must be authorized to work for ANY employer in the U.S or Canada. We are unable to sponsor or take over sponsorship of an employment Visa at this time.

This role is not eligible for visa sponsorship or relocation assistance.

Position requires valid work authorization that does not require sponsorship of a visa for employment authorization in the U.S.

Compensation

Competitive compensation including salary+ equity participation and benefits.

Why KYXStart

- Join early and be part of an exciting high-growth global company redefining how identity and payments verification works across markets as we get into a world instant payments, agentic commerce and programmable finance.

- Collaborate directly with successful entrepreneurial leadership on high-impact initiatives and with a collaborative, high performance and chill team environment. Flexibility to work remotely or form home.

- Gain financial upside and ownership through equity.

- Enjoy mission-driven product solving high impact customer problems in identity, agentic commerce and compliance.

- High visibility and autonomy—your decisions will directly shape our platform

- Remote-first team with flexibility across US and Canada

- Sense of ownership, self-accountability and enjoy working in a high growth startup

- Ability to influence product, culture, and processes

- Ample opportunity to professional grow in engineering, architecture, infrastructure, security engineering, data systems, or ML

Benefits:

Health insurance

Paid time off

Work from home

Education:

Bachelor's (Required)

Location:

United States (Preferred)

Work Location: Remote