Senior Software Engineer — Backend

Cari Network; Northern (KY); Hybrid; USD 110,000 - 150,000; Full time

Benefits offered by this job

Equity

Remote-first policy

401(k) matching

Job summary

Cari Network is building a blockchain-based payment system that enables real-time, 24/7 transfer of digital money across traditional finance and digital asset ecosystems. As a pre-launch startup, we’re creating a new category of financial infrastructure that brings cash on chain through tokenization and powers payments for banks, exchanges, and customers.

You will own core transaction processing platform infrastructure, including signing, settlement, ordering, and concurrency-control logic.

Qualifications

• 5–7 years of backend software engineering experience with systems that require ordering guarantees.
• Strong proficiency in TypeScript and functional systems (e.g., Effect.ts) is preferred.
• Experience with durable workflow/orchestration systems (e.g., Temporal) and distributed systems is a plus.
• Solid understanding of concurrency patterns like idempotency, at-least-once delivery, and reconciliation.

Responsibilities

• Own the transaction processing platform infrastructure for signing and settlement flows.
• Own the transaction-ordering and concurrency-control logic at scale.
• Design data models, API contracts, and retry/backoff logic for owned services; write RFCs for integration.
• Define production-readiness criteria: SLOs, alerts, and runbooks.
• Lead incident response and root-cause analysis; drive postmortems.
• Assess consistency models, failure modes, and architectural risk.
• Coordinate with Banking and Blockchain engineers to translate requirements into platform capabilities.

Skills

Backend engineering

TypeScript

Effect.ts

Temporal

Concurrency control

PostgreSQL

Kafka

Tools

Temporal

Job description

The Cari Network is building a blockchain-based payment system powering real-time, 24/7 movement of digital money across the traditional finance and digital asset ecosystems. A pre-launch startup, we’re creating an entirely new category of financial infrastructure that brings cash on chain through tokenization while powering the full spectrum of payments for our network—banks, digital asset exchanges, and, most importantly, the customers they serve.

About the Role

You’ll own core transaction processing platform infrastructure that our banking and blockchain services both build on—the durable workflow and ordering layer that keeps financial operations correct under concurrency.

You’ll be the trusted technical decision-maker for the services you own—defining what production-ready looks like, leading incident response when something breaks, and writing the design docs that other engineers, including ones outside your immediate team, build against.

What You’ll Do

• Own our transaction processing platform infrastructure for signing and settlement flows—service design, correctness guarantees, and operational health
• Own the transaction-ordering and concurrency-control logic that keeps our transaction processing platform correct and consistent at scale
• Design data models, API contracts, and retry/backoff logic for the services you own; write RFCs that Banking and Blockchain engineers rely on when integrating against your services
• Define what "production-ready" means for platform services you own: SLOs, alerting thresholds, and runbooks
• Lead incident response and root-cause analysis for the services in your domain, and drive postmortems that prevent recurrence
• Reason about consistency models, failure modes, and capacity for the systems you own, and flag architectural risk before it becomes an incident
• Coordinate directly with Banking and Blockchain engineers who depend on your services, translating their requirements into platform capabilities

Qualifications

• 5–7 years of backend software engineering experience, ideally including systems with strict correctness or ordering guarantees (financial transactions, ledgers, distributed queues)
• Strong proficiency in TypeScript; experience with Effect (effect.ts) or a comparable functional effect system strongly preferred
• Experience with durable workflow or orchestration systems (e.g. Temporal or similar)—either operating one in production or designing services on top of one
• Solid understanding of concurrency control patterns: partitioned/keyed execution, idempotency, at-least-once delivery, and reconciliation
• Production experience with PostgreSQL and Kafka or equivalent message infrastructure
• Comfortable owning a service independently, including the judgment calls on reliability and design that come with it
• Strong written communication—you’ll be writing RFCs that people outside your immediate team act on

Nice to Haves

• Prior work in fintech, payments, or another regulated financial infrastructure environment
• Experience with blockchain or custody-adjacent systems (transaction signing, nonce management)
• Familiarity with Terraform or infrastructure-as-code for provisioning the services you own
• Experience mentoring engineers or driving cross-team technical alignment

What We Offer

• Competitive compensation: salary, bonus, and equity
• 401(k) with matching program
• Flexible vacation policy (PTO) and remote-first work environment