Ether.fi
Posted 4mo ago

Backend Engineer - Card Transaction Processing

Ether.fi
New York City or Grand Cayman or Denver
$170k-$200k/yrHybridFull Time
Responsibilities
  • Own backend
  • Design services
  • Improve latency
Requirements
  • 5+ years backend software engineering
  • Strong problem solving
  • Experience with high-throughput transaction processing
  • Cloud infra, CI/CD, observability
  • Familiar with card payments
Technical tools mentioned
CloudCI/CDObservabilityPayment processing

Job description

About us:

Ether.fi is one of the largest crypto companies in the world. We have over $10B in assets under management and a team of 30 almost all technical staff. We’ve been profitable day one and are focusing on building real consumer applications.

The future we envisage is true on-chain banking. Our current products; Stake, Liquid, and Cash enable users to earn yield in a variety of DeFi strategies, and spend their assets in the real world with our credit cards. You can view public analytics on Dune for Cash and Stake.

Position overview:

We’re looking for a senior full backend software engineer to own core backend architecture, card transaction processing and high availability. You will belong to a key engineering team focusing on delivering distributed, scalable and robust backend systems. Everything from card transaction processing, low latency apis, microservice architectures and on-chain data indexing. Anything that a neobank would build is on our roadmap.

What you’ll do:

  • Own core areas of our backend systems, and extend current functionality to improve throughout and latency

  • Design, develop, and optimize scalable transaction processing services to support high-throughput, low-latency financial transactions.

  • Tackle the challenges in user frictions for their card transactions being declined

  • Drive improvements in our Cloud Infrastructure, CI/CD pipelines, automation, observability, and monitoring systems.

What we are looking for:

  • Strong fundamentals in software engineering and problem solving

  • You have shipped impressive products with thousands of real users

  • 5+ years of professional coding experience

  • Drive, willingness to work hard and go the extra mile. We are a highly ambitious, driven team with audacious goals, and we work very hard to make them a reality

  • Plus if you are experienced in credit card transaction processor such as Paymentology, Episode 6, etc.

  • Plus if you are experience in card issuing side

Perks and benefits:

  • Competitive salary, performance-based incentives, and token allocation grant

  • Opportunity to work on multi-billion dollar products as part of a small team

  • Health, dental, and vision insurance plans

  • Global team with opportunity for travel and working out of our 3 offices around the world

  • 4 weeks work from anywhere

  • Exciting company events and team-building off-sites

About Ether.fi

Decentralized platform for Ethereum staking and crypto banking services.

Year founded
2022
Employees
41
Organization type
Private
Latest investment
Raised $27.00M Series A (2024) — led by Bullish Capital, CoinFund
Subsidiaries
Headquarters
KY

Similar jobs

Backend Engineer roles near New York City, New York
1d
Save
Mark Applied
Hide
Senior Backend Engineer — Data Platform & AI Agents
Paris or New York City or London or Singapore
HybridFull Time
Jus Mundi
Jus Mundi: AI-powered search engine for international law and arbitration.
Requires 5+ years building production backend or data services, strong Python and Postgres expertise, production agentic LLM experience, document processing, DevOps, and fluent written and spoken English.
Python, Postgres, LangGraph, LangChain, LlamaIndex, Kubernetes, Elasticsearch, OpenSearch, TypeScript, React, PDF, HTML, OCR, MCP
2d
Save
Mark Applied
Hide
Senior Backend Engineer - Music Monetization & DRM
Stockholm or London or New York City or Los Angeles or Berlin or Paris or Oslo or Seoul
HybridFull Time
Epidemic Sound
Epidemic Sound: Provides royalty-free music and sound effects for content creators.
Backend development experience, preferably Go; SQL and large-scale data processing; algorithm evaluation; Google Cloud; microservices; Kubernetes, Helm, and Terraform; strong written and verbal English.
Go, SQL, Google Cloud Platform, Kubernetes, Helm, Terraform, Kotlin, Java, Python, TypeScript, React
2d
Save
Mark Applied
Hide
Senior Backend Engineer (Python or PHP) - New York - ONSITE 4X Week
New York City, New York, United States
$148k-$222k/yr OnsiteFull Time
Comcast
ComcastNASDAQ: CMCSA: Provides global telecommunications, media content, and entertainment services.
4+ YOERequires 4+ years with Python and Django, RESTful APIs, PHP, Kubernetes/EKS, AWS, production deployments at scale, and a bachelor's degree or equivalent experience.
Python, Django, PHP, Kubernetes, EKS, AWS
1w
Save
Mark Applied
Hide
Backend Engineer, Markets
New York, New York, United States
OnsiteFull Time
Polymarket
Polymarket: A decentralized platform for trading on real-world event outcomes.
1+ YOE1+ years backend experience, proficiency in TypeScript/Python/Go, third-party API integration, Linux and cloud tooling comfort, experience shipping production code; AI-assisted development familiarity preferred.
TypeScript, Python, Go, Claude Code, Codex, Cursor, Linux, Kafka, RabbitMQ
1w
Save
Mark Applied
Hide
Staff Backend Engineer, Custody Core (Crypto Security)
San Francisco or Seattle or New York City or Frisco or Cottonwood Heights or Helena or Jacksonville
$154k-$264k/yr OnsiteFull Time
SoFi
SoFiNasdaq: SOFI: Mobile-first platform for banking, lending, and investment services.
7+ YOE7+ years backend engineering experience building distributed, highly available services; strong REST, async messaging, cloud (AWS) experience; production debugging and incident response skills.
AWS, PostgreSQL, Redis, Kafka, Fireblocks, BitGo, Anchorage
1w
Save
Mark Applied
Hide
Sr. Backend Engineer – Java/Spring Boot | Onshore
Texas or Chicago or New York City
$40k-$140k/yr OnsiteFull Time, Contract
Photon: A global digital modernization firm delivering enterprise-grade backend and platform engineering services.
7+ YOE7+ years backend development experience with Java and Spring Boot, event-driven systems using Kafka, PostgreSQL, cloud (AWS/GCP/Azure) experience, CI/CD and containerization, strong testing and debugging skills.
Java, Spring Boot, Apache Kafka, PostgreSQL, Redis, AWS, GCP, Azure
1w
Save
Mark Applied
Hide
Backend Engineer_AI Gateway
Englewood Cliffs or Plano
$11k/mo OnsiteContract
SBT Global
SBT Global: Provides integrated IT consulting and global logistics management services.
Deep expertise in async Python and network programming, cloud infrastructure, container orchestration, streaming data, security gateways, IAM/SSO, observability, and CI/CD.
asyncio, aiohttp, anyio, WebSocket, SSE, TLS, HTTP/2, HTTP/3, gRPC, FastAPI, Pydantic, Docker, AKS, EKS, GKE, Istio, Envoy, Redis Streams, RabbitMQ, Kafka, PostgreSQL, PgBouncer, HashiCorp Vault, NGINX, Terraform, GitHub Actions, GitLab CI, CASB, DLP, WSS, Azure AD, Entra ID, Okta, SAML 2.0, OIDC, SCIM, Azure OpenAI, Datadog, Prometheus, Grafana, Azure Monitor
1w
Save
Mark Applied
Hide
Senior Backend Engineer (ML)
New York City, New York, United States
$200k-$230k/yr HybridFull Time
Tennr
Tennr: Automates healthcare referral workflows and patient intake with AI.
4+ YOE4+ years building production distributed systems or data infrastructure; strong backend fundamentals; proficiency in Python and TypeScript; hands-on AWS and PostgreSQL experience; observability and incident response skills.
Python, TypeScript, AWS, PostgreSQL, vLLM, SGLang, TensorRT, k8s