Senior Engineer, Security

Taptap Send; New York (NY); On-site; USD 170,000 - 235,000; Full time

Job summary

Taptap Send is seeking a Senior Engineer, Security to join our Platform Engineering team. This is a find-and-fix role handling vulnerabilities, writing Terraform or code fixes, and driving remediation with the CISO.

You will own AWS security, threat modelling, penetration testing, and incident response, collaborating with security and engineering teams to raise the bar for cloud and application security.

Qualifications

• Five or more years in hands‑on security engineering with production systems.
• You write and ship code. Terraform and Python, and enough application fluency to fix what you find rather than hand it off.
• Deep AWS security experience, including IAM and least privilege at organization scale, and container workloads in ECS or EKS.
• Application security, including threat modelling and hands‑on offensive testing against cloud and application targets.
• Security incident response, including forensic investigation.
• You have run vulnerability management and driven fixes through teams you do not manage; you work the finding queue on your own initiative, without being chased.
• You have worked in a regulated environment and turned ISO 27001, PCI DSS, or SOC 2 requirements into engineering work.
• Detection engineering in Datadog, or a comparable SIEM.
• Securing CI/CD pipelines, particularly GitHub Actions.
• Cryptography and secrets management in practice, including key rotation and certificate lifecycle.
• Using AI coding tools to remediate at scale, and reviewing AI-generated code with a security eye
• Experience with payments, cards, or digital assets.

Responsibilities

• Remediate security findings across infrastructure, writing Terraform and application changes that close them.
• Own AWS security: IAM, least privilege, network boundaries, secrets management, and logging coverage; define baselines and enforce as code.
• Find problems before anyone else: perform regular penetration testing and threat modelling for new services early.
• Respond when it matters: act as technical lead for security incidents, including forensic investigation and improving detection in Datadog.

Skills

Security engineering

Terraform

Python

AWS security

Threat modelling

Vulnerability management

Incident response

ISO 27001/PCI DSS/SOC 2

Datadog/SIEM

CI/CD security (GitHub Actions)

Cryptography & secrets

AI-assisted remediation

Payments/digital assets

Tools

Datadog

GitHub Actions

Snyk

Prowler

ASV

Job description

The Role

We're looking for a Senior Engineer, Security to join our Platform Engineering team. This is a find-and-fix role. When you find a vulnerability in our infrastructure, you write the Terraform or the application change that closes it. Where the fix belongs to another team, you drive it to completion, with the CISO supporting you.

You will report into Platform Engineering and work closely with our CISO, who sets the security agenda and is your escalation route when remediation stalls elsewhere.

Responsibilities

• Fix it, don't just find it: Remediate security findings across our infrastructure, writing the Terraform and application changes that close them. Where the fix belongs to another team, drive it to completion. Run vulnerability management from Snyk, Prowler, and ASV findings through to verified fixes.

• Own AWS security: Cloud posture across IAM and least privilege, network boundaries, secrets management, and logging coverage. Define the technical security baselines new services are built to, covering host hardening, WAF configuration and deployment patterns, and enforce them as code.

• Find problems before anyone else does: Regular penetration testing against our own environment, ahead of the formal annual assessment carried out by our external testers. Threat modelling and security review for new services early enough to change the design, including our integrations with payment and custody providers.

• Respond when it matters: Serve as technical lead for security incidents, including forensic investigation. Own and improve detection coverage in Datadog, tuning alerts for signals.

What you need

• Five or more years in hands‑on security engineering, with responsibility for production systems.

• You write and ship code. Terraform and Python, and enough application fluency to fix what you find rather than hand it off.

• Deep AWS security experience, including IAM and least privilege at organization scale, and container workloads in ECS or EKS.

• Application security, including threat modelling and hands‑on offensive testing against cloud and application targets.

• Security incident response, including forensic investigation.

• You have run vulnerability management and driven fixes through teams you do not manage; you work the finding queue on your own initiative, without being chased.

• You have worked in a regulated environment and turned ISO 27001, PCI DSS, or SOC 2 requirements into engineering work.

• Detection engineering in Datadog, or a comparable SIEM.

• Securing CI/CD pipelines, particularly GitHub Actions.

• Cryptography and secrets management in practice, including key rotation and certificate lifecycle.

• Using AI coding tools to remediate at scale, and reviewing AI-generated code with a security eye

• Experience with payments, cards, or digital assets.

About Us

We're building the world's leading cross‑border fintech for emerging markets - empowering families, fuelling local economies, and changing how millions access financial services.

Since our launch in 2019, we have transformed how money moves across borders with our operations spanning 6 out of 7 continents and covering both the busiest and most underserved (remittance) corridors. We tapped into a massive shift - from banks to phones - bringing digital finance to places where traditional systems never reached. The next stage of growth will fuel a network of services and products especially designed to make money more accessible to diaspora communities including local cards, and additional savings and payments features.

We're growing fast, backed by world‑class investors, and scaling a product that blends real world impact with cutting edge fintech innovation.

Here's a little more:

• Founded by Harvard grads and 3‑time founders who previously built Segovia (acquired) and GiveDirectly (>$300M revenue, fastest‑growing NGO in the world)

• Backed by top investors including Spark Capital, Canaan, Reid Hoffman, Breyer Capital, Unbound, Wamda, and more

• Built by global top performers from Bain, Google, McKinsey, Uber, Checkout, Bolt, and beyond - we move fast, stay humble, and care deeply about our mission

• Truly global team - 250+ people, 50+ nationalities, 50+ languages

• Guided by our values - ownership, impact, humility, and heart - in deed, not just word

Taptap Values

Impact first

Team next

Accept reality

Propose solutions

Win with grit

Be proactively candid, with yourself and others

Love the particular

Own it

Create positive energy

Maybe, even have fun

Taptap Send is an equal opportunity employer dedicated to building an inclusive and diverse workforce. All employment decisions are decided on the basis of qualifications, experience and business need. We strongly encourage applications who are members of underrepresented communities to apply.

If you require reasonable adjustments to be made during the recruitment process, please do not hesitate to let us know. Any information you provide us in this respect will only be used to accommodate your requirements.

Note: we recognize imposter syndrome is real - any candidate that does not perfectly fit every characteristic of this role is still strongly encouraged to apply.