Senior Software Engineer II, Customer Experience

Kard Financial, Inc.; United States; Remote; USD 160,000 - 190,000; Full time

Benefits offered by this job

Flexible PTO

Health, Dental, Vision Insurance

401k with employer match

WFH setup reimbursement

Company offsites

Job summary

Kard Financial, Inc. is seeking a Senior Software Engineer II, Customer Experience, to design and build scalable backend services powering the rewards experience. This remote role centers on transaction matching, offer ingestion, and partner integrations, with leadership through Shape Up cycles and on-call responsibilities.

You will improve issuer APIs and SDKs, mentor engineers, and drive cross-team collaboration in a fast-growing, remote-first environment.

Qualifications

• Expert programming skills in Go and/or TypeScript for backend services.
• Experience with distributed systems and event-driven architectures.
• Proficiency with AWS and IaC (Terraform), containers (Kubernetes/EKS) and serverless (Lambda).
• Experience in transaction-processing or ingestion pipelines where correctness matters.
• Ability to write clear specs and drive cross-team collaboration.

Responsibilities

• Architect and build scalable backend services (Go/TS) for CX.
• Own features end-to-end through the Shape Up process with a written launch/rollback plan.
• Participate in on-call, incident response, and root-cause analysis.
• Improve issuer/client-facing APIs and SDKs for reliability and self-service.
• Lead technical decisions and foster collaboration across Product, Design, and Engineering.
• Enhance security, reliability, and observability through best practices and testing.

Skills

Go programming

TypeScript

Distributed systems

AWS

Terraform

Kubernetes

Postgres

MongoDB

SQS

Temporal

API design

SDKs

On-call

Incident response

Tools

Datadog

Cognito

Envoy

API Gateway

Job description

Senior Software Engineer II, Customer Experience

Remote

Kard is building commerce media infrastructure that connects financial institutions, financial-services platforms, and merchants through data and merchant-funded rewards. As our reach expands, we are building for a step-change in scale, and for opportunities ranging from more relevant rewards and marketer intelligence to new commerce and distribution models.

About the Role

The Customer Experience (CX) team owns the systems that power Kard's end-to-end rewards experience:transaction matching and the cellar pipeline, offer ingestion and delivery (including partner integrations likeRewards Network and SEATED), the cell-based routing architecture, and the Support API that keeps our internaland partner-facing tooling running. As a Senior Software Engineer II, you'll operate at the center of this —designing and building the services that ingest, match, and settle transactions at scale, while helping the teamraise its bar on operational readiness, testing, and documentation.

This role reports into the CX engineering team, with a strong focus on our issuer and partner-facing surface area,working alongside Support, Design, and Product through Kard's Shape Up-based pitch cycle. You'll drive pitchesend-to-end, participate in on-call, and help the team keep pace with a fast-growing transaction volume andissuer surface.

Responsibilities

• Architect and build scalable services across transaction matching, the cellar pipeline, and offer ingestion— new work defaults to Go and Postgres; existing services are a mix of TypeScript and MongoDB.
• Own features end-to-end through Kard's Shape Up cycle: discovery, pitch writing, implementation,testing, and production rollout, including a written launch/rollback plan for anything touching
  transaction or offer data.
• Actively participate in on-call, incident response, and IOC (interrupt/on-call) triage; drive root-cause fixesrather than one-off patches (e.g., ingestion validation gaps, UID/timestamp mismatches, Datadog alert
  coverage).
• Strengthen our issuer/client-facing APIs and SDKs — reliability, clarity, and self-service — so partnersand Support can resolve more issues independently, reducing engineering escalations.
• Lead by example: make decisive technical calls and foster collaboration across Product, Design, andEngineering to keep the team moving toward CX's strategic goals.
• Champion enhancements to our tech stack, methodologies, and standards — authentication, ratelimiting, deployment, observability, error handling, and test coverage (unit, integration, end-to-end) —
  with an eye toward resilience, agility, and quality, not just shipping speed.
• Mentor engineers, contribute to design and architecture discussions, and help the team consolidate ordeprecate legacy/overlapping services rather than letting them accumulate.
• Write clear documentation and playbooks (local dev setup, deployment, troubleshooting) so ownershipdoesn't stay concentrated with one or two people.

Desired Skills

• Expert programming skills in Go and/or TypeScript, with experience building scalable, secure, high-performance backend services.
• Solid experience with distributed systems, event-driven architectures (SQS, Temporal), and bothrelational and document databases (Postgres and MongoDB).
• Proficiency with AWS and Infrastructure-as-Code (Terraform), including container technologies(Kubernetes/EKS) and serverless components (Lambda).
• Experience working on transaction-processing, matching, or ingestion pipelines where correctness andidempotency matter.
• Comfort leading a technical project from discovery through production rollout, including writing clearspecs and driving cross-team collaboration (e.g., with Support, Data, or partner integration teams).
• Skilled with agentic software development — using AI tools (e.g., Claude Code, Codex) to plan andimplement complex features, not just autocomplete — while still owning the design and quality of theresult.
• Commitment to fostering an inclusive, collaborative engineering culture.
• U.S. core business hours availability and willingness to travel for company meetings.

Bonus Points

• Experience with card-linked offers, loyalty, fintech, or another transaction-intensive marketplace.
• Experience with partner data ingestion (file-based or API) and the validation/monitoring needed to runit reliably in production.
• Familiarity with Cognito-based auth, API gateway enforcement (e.g., Envoy), or claims-basedauthorization.
• Experience with Databricks or a similar data platform, and with migrating services from a legacy stack(e.g., Databricks to Postgres/Lakebase) without disrupting production.
• Contributions to the tech community or open-source projects.
• Past success in startup settings, and a track record of empathy, collaboration, and productivity in remotework.

Compensation

• United States: $160,000 - $190,000 USD
• Argentina: $120,000 - $140,000 USD

Why Join:

Kard recognizes the unique value each of us brings to our collective success. As part of our remote-first team, you'll have the autonomy to influence our trajectory, actively contributing to the growth of our business and the evolution of our company culture. By embodying our core values of Initiative, Openness, and Humility, you will not only witness but directly foster an inclusive and dynamic work environment, from the executive level down.

• Flexible PTO, with a minimum requirement to take one day off a quarter, ten days a year, promoting mental well-being
• Observance of 11 Federal Holidays, plus an additional day each for Black Friday and Christmas Eve (US employees only)
• Health, Dental and Vision Insurance
• 401k with employer match (US employees only)
• Coworking space and WFH setup reimbursement
• Company Offsites for planning, team-building, and networking

Kard recognizes the unique value each of us brings to our collective success. As part of our remote-first team, you'll have the autonomy to influence our trajectory, actively contributing to the growth of our business and the evolution of our company culture. By embodying our core values of Initiative, Openness, and Humility, you will not only witness but directly foster an inclusive and dynamic work environment, from the executive level down.

Our competitive benefit plan includes:

• Flexible PTO, with a minimum requirement to take one day off a quarter, ten days a year, promoting mental well-being
• Observance of 11 Federal Holidays, plus an additional day each for Black Friday and Christmas Eve (US employees only)
• Health, Dental and Vision Insurance
• 401k with employer match (US employees only)
• Coworking space and WFH setup reimbursement
• Company Offsites for planning, team-building, and networking

Kard is an equal opportunity employer and we actively encourage applicants of all genders, backgrounds, and experiences to apply. We believe that diverse perspectives enrich our workplace and drive our success.