Full-Time

Senior Full Stack Developer

Posted on 10/31/2025

Walrus

Walrus

11-50 employees

Secures push payments via authentication

Compensation Overview

$160k - $225k/yr

+ Equity + Relocation Assistance

No H1B Sponsorship

Remote in USA + 1 more

More locations: New York, NY, USA

Remote

Relocation assistance available for NYC on-site option.

Category
Software Engineering (1)
Requirements
  • 5+ years of experience designing, building, and deploying sophisticated web applications.
  • Experience with tools for testing.
  • Curiosity, and an interest in teaching and learning from your colleagues.
  • Strong written communication skills.
Responsibilities
  • Design, build, and own exciting new modules for the flagship product, including payments, reputation, and new kinds of authentication.
  • Design software in a thoughtful way that takes into account bug prevention, testability, and maintainability.
  • Contribute to product design decisions with data-driven evidence; collaborate with the team to deliver software.
  • Write a lot of code and influence ways of approaching software development within an early-stage company.
Desired Qualifications
  • Experience with modern UI frameworks, web standards, and web development best practices.
  • Detailed understanding of the design of data models for use in relational databases.
  • Experience using cloud infrastructure to deploy reliable and scalable web applications.
  • Built authentication flows and/or implemented secure APIs.
  • Built or used tools for data analysis, performance profiling, and debugging.

Walrus Security provides a B2B fintech platform that secures push payments through authentication technology. Its main product, DoubleCheck, helps financial-sector clients securely collect payment details for transactions involving wires and stock, aiming to reduce electronic impersonation fraud while keeping the process smooth for users. The company serves funds, fund administrators, fundraising platforms, and exchanges, and has processed over $6 billion in transaction volume, signaling trust and adoption in its niche. Unlike broader payment-security tools, Walrus Security concentrates on preventing impersonation fraud in payment details and frictionless collection for high-risk payment workflows. The goal is to minimize fraud risk and operational friction for institutions handling sensitive payment data.

Company Size

11-50

Company Stage

Seed

Total Funding

$4.5M

Headquarters

New York City, New York

Founded

2019

Simplify Jobs

Simplify's Take

What believers are saying

  • Processed over $6 billion in transactions with $1 trillion AUM clients.
  • Integrates seamlessly with treasury, bank, and ERP workflows.
  • Outperforms email and callbacks using multiple identity signals.

What critics are saying

  • Deepfake voice cloning bypasses out-of-band calls in 6-12 months.
  • Plaid and Stripe integrations capture market share immediately.
  • FedNow's fraud detection obsoletes DoubleCheck in 18-24 months.

What makes Walrus unique

  • DoubleCheck authenticates counterparties before accepting payment details.
  • Nacha Preferred Partner for ACH fraud prevention since April 8, 2026.
  • Transaction guarantee protects against BEC and impersonation fraud.

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Benefits

Health Insurance

Dental Insurance

Vision Insurance

Parental Leave

401(k) Retirement Plan

401(k) Company Match

Relocation Assistance

Unlimited Paid Time Off

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

-6%

1 year growth

-6%

2 year growth

0%
WalrusFi
Apr 8th, 2026
Walrus Security is now a Nacha Preferred Partner.

Walrus Security is now a Nacha Preferred Partner. Michael Walfish April 8, 2026 Walrus Security, Inc. is excited to be a Nacha Preferred Partnerfor Account Validation, Fraud Monitoring, and Risk and Fraud Prevention. Nacha governs the ACH Network, setting standards and rules for the payment system that facilitated over 35 billion payments in 2025. Payment fraud starts before a transaction reaches the ACH Network. Attackers manipulate payment instructions upstream, when account details are being exchanged. DoubleCheck helps organizations authenticate their counterparties before accepting payment details, stopping fraud where it starts and maintaining the integrity of the ACH Network. Read the full article from Nacha: Nacha Announces Walrus Security as a Preferred Partner for Account Validation, Fraud Monitoring, and Risk and Fraud Prevention

DealStreetAsia
Jul 15th, 2020
India Deal Monitor: Better Capital invests in neobank Walrus and more updates

The startup said, it plans to utilise the funding to expand its team and enhance product features.

INACTIVE