Senior Back-End Engineer - Buenos Aires, Argentina

Benchstrength; Buenos Aires; Hybrid; ARS 1,800,000 - 3,000,000; Full time

Job summary

heva is seeking a Senior Back-End Engineer to build the core infrastructure for trusted healthcare, AI, and payment platforms. You will design, develop, and scale backend systems handling medical data, financial transactions, and real-time AI workflows.

You will work with frontend, AI, and product teams to ship secure, compliant, and high-performance services in a regulated environment. The role emphasizes reliability, security, and scalable design.

Qualifications

• 5+ years backend development with Go and PostgreSQL.
• Experience with RESTful and GraphQL APIs.
• Proven ability to design scalable, secure microservices.

Responsibilities

• Develop and maintain high-performance backend services with Go (Gin) and PostgreSQL.
• Design and optimize RESTful and GraphQL APIs powering frontend and AI features.
• Integrate payment systems (Stripe) ensuring secure, compliant transactions.
• Leverage Redis for caching, rate limiting, and distributed task management.
• Architect and maintain microservice-based systems with observability and fault tolerance.
• Collaborate with AI engineers to deploy and serve ML models efficiently.
• Implement secure authentication and RBAC using JWT/OAuth2.
• Drive code quality, reviews, and documentation.

Skills

Golang

PostgreSQL

RESTful API

GraphQL

Security best practices

Team collaboration

Tools

Docker

Kubernetes

Redis

Kafka

NATS

RabbitMQ

Terraform

Stripe API

OAuth2

Job description

As a Senior Back-End Engineer at heva, you will be building the core infrastructure at the intersection of healthcare, crypto, and AI. You’ll design, develop, and scale the backend systems that power our AI-driven care platform, our payments and wallet infrastructure, and our cross-border healthcare operations. You will work closely with front-end engineers, AI/agent engineers, and product leaders to ship secure, compliant, and high-performance systems that handle sensitive medical data, financial transactions, and real-time AI workflows. This role requires deep expertise in Golang, PostgreSQL, and cloud-native architectures, as well as strong experience designing APIs, scaling distributed systems, and optimizing data-intensive workloads. You’ll be building foundational systems that sit in a high-trust, regulated environment, where reliability, security, and correctness matter as much as speed. In short: you’ll be helping build the operating system for Care Without Borders — where modern AI meets healthcare delivery and global payments.

Product Argentina Full Time

Locations

What you'll do

• Develop and maintain high-performance backend services using Golang (Gin) and PostgreSQL.
• Design and optimize RESTful and GraphQL APIs powering front-end and AI-driven features.
• Integrate payment systems (e.g., Stripe) ensuring secure, reliable, and compliant transactions.
• Leverage Redis for caching, rate limiting, and distributed task management.
• Architect and maintain microservice-based systems with strong observability and fault tolerance.
• Collaborate with AI engineers to deploy and serve machine learning models efficiently.
• Implement secure authentication and RBAC using JWT/OAuth2 and best security practices.
• Drive code quality, mentorship, and engineering excellence, including reviews and documentation.

What we're looking for

• 5+ years of backend development experience with a strong command of Golang (Gin) and PostgreSQL.
• Proven expertise in schema design, query optimization, and indexing strategies for large-scale databases.
• Proficiency in RESTful and GraphQL API architecture for scalable, modular backend systems.
• Hands-on experience with Redis, message queues (Kafka, NATS, or RabbitMQ), and distributed systems.
• Deep knowledge of cloud infrastructure and DevOps using Docker, Kubernetes, and CI/CD pipelines (Terraform, Cloud Build, etc.).
• Experience building microservice architectures, including inter-service communication and API gateways.
• Skilled in secure payment integrations, webhook validation, and financial transaction flows.
• Strong understanding of authentication and data protection using JWT, OAuth2, and encryption standards.
• Adept at debugging, profiling, and performance tuning Go services in production environments.
• Excellent collaboration, communication, and ownership mindset, with a focus on reliability and results.