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Added 2 months ago
PI
Java Engineer (Architect / Technical Lead) - Agentic AI
Princeton IT Services, Inc
Toronto, ON
- Full-time
Senior Java Engineer (Architect / Technical Lead) Agentic AI
Added 1 month ago
F
Senior Software Engineer (AI & Full Stack)
Fable
Remote, Canada
- Full-time
- Remote
Fable is looking for a highly motivated Senior Software Engineer with deep backend expertise, strong full-stack development skills, and hands-on experience building AI-powered applications…
Added 26 days ago
Principal Developer Support Engineer - Builder Experience (BX)
Okta
Toronto, ON
This is not primarily a queue role. You will mostly engage on cases that exceed senior engineer scope, the ones that need architecture judgment, not triage.
Added 1 month ago
CI
Senior Engineer, TFM, Risk & Total Fund Management Technology
CPP Investments | Investissements RPC
Toronto, ON
- Full-time
As Senior Engineer, Total Fund Management Technology, you will design, build, test, and support technology solutions that enable portfolio construction, monitoring, analytics, and Total…
Added 29 days ago
Senior Software Engineer, Full-Stack Applications - Ratings Technology
Fitch Group
Toronto, ON
Fitch Ratings is seeking a Senior Software Engineer to join our organization. This role is about leading the development of what comes next: intelligent applications, full-stack platforms…
Added 2 months ago
P
Senior Application Security Engineer
Paymentus
Richmond Hill, ON
- $110,000 to $150,000 USD / year
- Full-time
The Senior Application Security Engineer is responsible for helping secure the Paymentus SaaS platform by partnering directly with software engineering, product, cloud infrastructure,…
Added 2 months ago
JG
Senior QA API Tester - (API testing using Ready API , Katalon)
J&M Group
Toronto, ON
- Full-time
…programming languages such as such as ReadyAPI (SoapUI Pro),Git, Java, Groovy Script ,Selenium, Jenkins, SQL Developer, JIRA and Confluence,Responsible for QA testing of RESTful…
Added 2 months ago
A
Senior Solutions Consultant - Open Data Platform
Acceldata
Kitchener, ON
- Full-time
Comfortable writing code in either Java, Python or Scala.
Added 2 months ago
AC
Product Engineering (Integration Java Developer)
Allstate Canada
Toronto, ON
- Full-time
We are looking for an experienced Product Engineering (Integration Java Developer) to play a key role within this global team which will comprise members from ACG, Allstate Northern Ireland…
Added 1 month ago
M
Senior Platform Engineer
Midnite
Remote, Canada
- Full-time
- Remote
We're looking for a Senior Platform Engineer to help evolve the systems that power Midnite as we scale across markets, starting with our Canada launch.
Added 29 days ago
Senior SDET
Tigera
Vancouver, BC
Tigera is hiring a Senior SDET to own quality for Calico’s converged networking, the capability that lets enterprises run virtual machines and containers side by side on Kubernetes.…
Added 1 month ago
P
Senior Software Engineer C# .NET
Prophix
Remote, Canada
- Full-time
- Remote
As a Senior Software Engineer at Prophix, you'll play a central role in shaping the product that over 2,500 finance teams around the world rely on every day for budgeting, reporting, and…
Added 2 months ago
C
Senior Java Backend Developer (Open Liberty)
CGI
Toronto, ON
- Full-time
Good hands-on development experience in Java for 5yrs +
Added 2 months ago
C
Senior Full Stack Developer (contract)
Capgemini
Toronto, ON
- Contract
6 to 8+ experience in developing application using both Front end and Back end like Angular, Node Js, Core Java, Spring, Spring boot, REST API etc.
Added 2 months ago
GL
Senior IT Security Advisor (Application Security)
goeasy Ltd.
Mississauga, ON
- Full-time
The Senior IT Security Advisor, Application Security plays a critical role in protecting and enabling goeasy's technology landscape. As a senior security expert, you'll lead security…
Added 2 months ago
C
Sr Director, App Delivery
CIBC
Toronto, ON · Greater Toronto Area, Canada
- Full-time
As the Senior Director of Application Delivery, you will oversee the strategy, execution, and delivery of large-scale technology initiatives across the Commercial and Corporate Banking…
Added 1 month ago
T
Senior Android Developer
Taiv
Winnipeg, MB
- Full-time
We are looking for a Senior Android Developer to join our growing team!
Added 1 month ago
P
Senior Back End Engineer Java/OLAP
Prophix
Remote, Canada
- Full-time
- Remote
…possible for more than 3,000 finance teams worldwide. As a Senior Back-End Engineer specializing in Java and OLAP, you will own the Java side of that engine - designing, optimizing, and…
Added 1 month ago
BC
Sr. Software Engineer (AI/ML)
Blackpoint Cyber
Remote, Canada
- $150,000 to $180,000 CAD / year
- Full-time
- Remote
…AI/ML to accelerate Blackpoint Cyber's ML/AI capability. As a Senior Software Engineer on this team, you'll own back-end systems and data/ML pipelines end-to-end, work cross-functionally…
Added 1 month ago
Senior Software Engineer, Wallet
Robinhood
Toronto, ON
As a Senior Software Developer, you’ll build and own the backend services, infrastructure, and data systems that support Robinhood Wallet products. You will develop reliable and secure…
Added 1 month ago
IF
Senior FullStack Developer - Java/Angular
Intact FC
Montreal, QC
- Full-time
Web Dev: Angular – JAVA – Spring Boot + Spring Cloud - MongoDB / Oracle / SOAP
Added 1 month ago
O
Software Developer
OceanMD
Toronto, ON
- Full-time
Reporting to the Vice President, Research and Development, we are hiring a Software Developer. As our new Software Developer, you will build and enhance the health technology that helps…
Added 2 months ago
KS
Senior Infrastructure Consultant
Kumaran Systems
Toronto, ON
- Full-time
Deploy and troubleshoot Java/J2EE applications on Oracle WebLogic Server.
Added 2 months ago
GD
Senior Engineer I
Groupe Dynamite
Mont-Royal, Quebec
- Full-time
…a modern E-commerce mobile app ecosystem. As an experienced Senior Engineer, you will lead feature development, mentor junior engineers, and influence architecture for mission-critical…
Added 3 months ago
TS
Sr. Software Developer - Hybrid/Secret Cleared
The Source Staffing
ON · Ottawa West, Ontario
- Full-time
Senior Software Developer - Hybrid/Secret Cleared 90-110k

Paymentus

Senior Application Security Engineer

Richmond Hill, ON, Canada

$110,000 to $150,000 USD / year · Full-time

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Applications open in a new tab.

Job details

Pay: $110,000 to $150,000 USD / year
Job type: Full-time
Experience: 6+ years of experience in software engineering, application security, product security, platform security, security engineering, or a closely related technical role.
Posting language: English
Posted: Jul 20, 2026

Original job description

Summary/Objective

The Senior Application Security Engineer is responsible for helping secure the Paymentus SaaS platform by partnering directly with software engineering, product, cloud infrastructure, DevOps, and security teams to identify, assess, and remediate application security risks across web applications, RESTful APIs, microservices, cloud-native services, and AI-enabled application components.

This is a hands-on technical role reporting to the Manager of Platform Security. The Senior Application Security Engineer will perform secure design reviews, threat modeling, source code review, API security assessments, application security testing, vulnerability validation, and remediation guidance for applications and services that support Paymentus’ payment technology platform.

The successful candidate must have strong hands-on software development experience, deep knowledge of modern application security, and the ability to work effectively with engineering teams to improve security without unnecessarily slowing product delivery. This role requires practical expertise in SaaS application security, RESTful API security, cloud-native application patterns, secure coding, software supply chain risk, and emerging AI/LLM application security risks.

Supervisory Responsibility

This role does not have direct supervisory responsibility.

The Senior Application Security Engineer is expected to provide technical leadership, mentorship, and guidance to software engineers, security engineers, and other technical stakeholders. This includes helping engineering teams understand security risks, adopt secure coding practices, and remediate application security issues effectively.

Education and Experience

Bachelor’s Degree in Engineering, Computer Science, Software Engineering, Information Security, or a related technical field, or equivalent practical experience.
6+ years of experience in software engineering, application security, product security, platform security, security engineering, or a closely related technical role.
Extensive hands-on development experience in one or more of the following languages: Java, NodeJS, Python, Golang.
Strong understanding of modern SaaS application architecture, web applications, microservices, distributed systems, RESTful APIs, authentication, authorization, session management, secure data handling, and service-to-service communication.
Deep knowledge of application security vulnerabilities and secure remediation patterns.
Strong knowledge of API security risks, including broken object-level authorization, broken function-level authorization, excessive data exposure, mass assignment, unrestricted resource consumption, improper inventory management, and unsafe third-party API consumption.
Strong understanding of modern application security guidelines, including OWASP Top 10, OWASP API Security Top 10, and OWASP Top 10 for Large Language Model Applications.
Practical knowledge of AI and LLM application security risks, including prompt injection, insecure output handling, sensitive data exposure, insecure plugin/tool usage, model misuse, excessive agency, and AI supply chain concerns.
Hands-on experience performing secure code review, threat modeling, architecture review, vulnerability validation, and security testing.
Experience using and tuning application security tools such as SAST, DAST, SCA, container scanning, IaC scanning, secrets scanning, and API security testing tools.
Experience securing applications deployed in one or more public cloud environments, including AWS, GCP, or Azure.
Knowledge of Kubernetes, containerization, container registries, container image hardening, workload identity, secrets management, network policies, and runtime security concepts.
Knowledge of serverless application security, including function permissions, event validation, input handling, logging, dependency control, and abuse prevention.
Familiarity with application servers, web servers, and reverse proxy technologies such as Tomcat, JBoss, nginx, or similar platforms.
Familiarity with CDN, WAF, bot mitigation, rate limiting, and edge security controls using platforms such as Cloudflare and Fastly.
Experience working with CI/CD pipelines, source control systems, artifact repositories, build systems, infrastructure as code, and developer workflow automation.
Ability to analyze security findings, determine exploitability, identify root cause, and recommend practical remediation steps.
Ability to work independently, manage multiple priorities, and deliver high-quality results in a fast-paced engineering environment.
Strong written and verbal communication skills, including the ability to explain security issues clearly to technical and non-technical stakeholders.
Strong collaboration skills and the ability to build trusted working relationships with engineering, product, DevOps, cloud infrastructure, compliance, and security teams.

Preferred Qualifications

Experience working in fintech, payments, banking, financial services, or another highly regulated SaaS environment.
Experience with payment processing, cardholder data environments, tokenization, fraud controls, transaction platforms, or payment APIs.
Experience supporting PCI DSS, SOC 2, SOX technology controls, NIST CSF, ISO 27001, or similar security and compliance frameworks.
Experience with Spring Security, Java security libraries, OAuth 2.0, OIDC, SAML, JWT, mTLS, API gateways, and service-to-service authentication patterns.
Experience with Kubernetes admission controls, service mesh security, policy-as-code, runtime detection, and cloud workload protection platforms.
Experience building secure shared libraries, developer security tooling, reusable security controls, or paved-road security patterns.
Experience with bug bounty programs, red team engagements, penetration testing, or exploit development.
Relevant certifications such as CSSLP, CISSP, CCSP, GWAPT, GWEB, OSWE, AWS Security Specialty, Google Professional Cloud Security Engineer, Azure Security Engineer, CKS, CKAD, or equivalent practical experience.

EEO Statement

Paymentus is an equal opportunity employer. We enthusiastically accept our responsibility to make employment decisions without regard to race, religious creed, color, age, sex, sexual orientation, national origin, ancestry, citizenship status, religion, marital status, disability, military service or veteran status, genetic information, medical condition including medical characteristics, or any other classification protected by applicable federal, state, provincial, and local laws and ordinances. Our management is dedicated to ensuring the fulfillment of this policy with respect to hiring, placement, promotion, transfer, demotion, layoff, termination, recruitment advertising, pay, and other forms of compensation, training, and general treatment during employment.

Reasonable Accommodation

Paymentus recognizes and supports its obligation to endeavor to accommodate job applicants and employees with known physical or mental disabilities who are able to perform the essential functions of the position, with or without reasonable accommodation. Paymentus will endeavor to provide reasonable accommodations to otherwise qualified job applicants and employees with known physical or mental disabilities, unless doing so would impose an undue hardship on the Company or pose a direct threat of substantial harm to the employee or others.

An applicant or employee who believes he or she needs a reasonable accommodation of a disability should discuss the need for possible accommodation with the Human Resources Department, or his or her direct supervisor.

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More about this job

Responsibilities

The Senior Application Security Engineer is responsible for securing the Paymentus SaaS platform by identifying and remediating risks across web applications, APIs, and AI components. This role involves performing secure design reviews, threat modeling, and providing technical leadership to engineering teams.

Requirements

Candidates must have a Bachelor's degree in a technical field and over 6 years of experience in software engineering or application security. Deep expertise in modern SaaS architecture, cloud-native patterns, and multiple programming languages like Java or Python is required.

Skills

Application Security
Secure Code Review
Threat Modeling
API Security
Cloud Security
Java
NodeJS
Python
Golang
OWASP Top 10
Kubernetes
SAST
DAST
SCA
CI/CD
AI/LLM Security

Visa sponsorship

Not detected in the job text

Keywords

SaaS
RESTful APIs
Microservices
Cloud-native
AI
LLM
OWASP
SAST
DAST
SCA
AWS
GCP
Azure
Kubernetes
Docker
CI/CD
Infrastructure as Code
PCI DSS
SOC 2
OAuth 2.0
OIDC
JWT
mTLS
Nginx
Cloudflare
Fastly
CSSLP
CISSP
CCSP
Fintech

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