Senior Fullstack Developer

EPAM Systems; Argentina; Hybrid; ARS 90,953,000 - 151,589,000; Full time

Benefits offered by this job

Healthcare benefits

Paid time off

Upskilling & certifications

LinkedIn Learning access

Job summary

EPAM Systems is seeking a Senior Fullstack Developer to bridge business priorities with hands-on implementation across a global, multi‑department organization. You will translate use cases into solid architectures, drive API contracts, and deliver enterprise‑grade integrations with tools like Salesforce, ServiceNow, Jira and Oracle HCM, while coordinating with teams in India.

You will lead security, observability, and scalable patterns, delivering production backlogs and prototypes across UI,

Qualifications

• Three-plus years of hands-on full-stack engineering experience with a proven delivery record.
• Strong TS/JavaScript with a modern frontend framework such as React.
• Backend development with Node.js or Python and solid API/integration design.
• Proven track record delivering AI/LLM‑driven solutions including tool calling, RAG or agent frameworks.
• Translate stakeholder findings into functional architecture and actionable backlog.
• AWS delivery experience including Lambda, API Gateway, ECS/EKS, S3, RDS/DynamoDB, IAM, CloudWatch; SSO/Okta and RBAC.
• Ability to lead technical discussions in English with US‑based stakeholders (B2 level+).

Responsibilities

• Work with product owners and stakeholders across IT, Sales, Finance, and HR to align priorities.
• Convert use cases into architecture designs, UX/flow diagrams, API contracts, and a ready backlog for India.
• Develop and integrate workflows across Salesforce, ServiceNow, Jira, Glean, and Oracle HCM.
• Lead demanding integration projects covering authentication setup, data contracts, RBAC, and production launches.
• Coordinate daily with the India team to resolve questions, review PRs, and remove blockers.
• Build prototypes for UI components and MCP/LLM integration, delivering a production backlog to India.
• Incorporate security, observability, and reusability across builds for lasting value.

Skills

TypeScript

JavaScript

React

Node.js

Python

API design

AI/LLM

MCP

RBAC

SSO/Okta

English comms

Tools

AWS

S3

Lambda

API Gateway

Jira

Salesforce

ServiceNow

Glean

Oracle HCM

Job description

We're aiming to bring a Senior Fullstack Developer onto our expanding team. This position connects high-level business priorities with hands‑on technical implementation across a widely distributed, multi‑department organization. You'll infuse structured engineering rigor into fluid, still‑forming problems, all while contributing to how the organization adopts and integrates new technology. It's an opportunity to make a real difference in how enterprise systems scale and connect.

Responsibilities

• Work hand-in-hand with product owners and stakeholders across IT, Sales, Finance, and HR, coordinating schedules to support live, direct collaboration
• Convert vaguely defined internal use cases into robust architecture designs, UX/flow diagrams, API contracts, and a development‑ready backlog for the team in India
• Develop and interconnect agentic workflows spanning enterprise systems such as Salesforce, ServiceNow, Jira, Glean, and Oracle HCM
• Take charge of demanding integration projects, covering authentication setup, MCP tool access, data contract design, RBAC configuration, error handling, and production launch
• Sync up daily with the India‑based team to resolve outstanding questions, review pull requests, eliminate integration hurdles, and maintain quality standards ahead of release
• Build out prototypes when needed, spanning UI components, agent flow design, or MCP/LLM integration work, then deliver a production‑ready backlog to the India team
• Incorporate security, observability, and reusability principles into every build so agents deliver lasting value rather than functioning as one‑time demos

Requirements

• Three-plus years of hands‑on, relevant full‑stack engineering experience, supported by a current and active delivery record
• Strong expertise in TypeScript/JavaScript paired with a modern frontend framework such as React or an equivalent tool
• Solid backend development background using Node.js or Python, combined with strong API and integration design capabilities
• Established track record delivering AI/LLM‑driven solutions, including tool calling, RAG, agent frameworks, MCP, prompt workflows, or similar practical delivery
• Demonstrated ability to translate stakeholder workshop findings into functional architecture and a practical, actionable backlog
• Hands‑on AWS delivery experience covering Lambda, API Gateway, ECS/EKS, S3, RDS/DynamoDB, IAM, and CloudWatch, plus enterprise authentication approaches such as SSO/Okta and RBAC
• Capable communicator who can lead technical discussions in English with US‑based stakeholders, holding working fluency at B2 level or higher, converting business needs into agentic architecture

Nice to have

• Understanding of MCP gateways, LLM gateways, model routing approaches, policy/audit tooling, and cost/usage monitoring systems
• Background implementing OpenTelemetry or similar observability tools to monitor agent traces, tool call behavior, latency, and failure patterns
• Practical exposure to platforms such as Salesforce, Gong, Clari, Glean, ServiceNow, Oracle HCM, Concur, or similar HR/IT tools
• Experience transforming internal platforms or early prototypes into reliable, enterprise‑grade production solutions

We offer

• International projects with top brands
• Work with global teams of highly skilled, diverse peers
• Healthcare benefits
• Employee financial programs
• Paid time off and sick leave
• Upskilling, reskilling and certification courses
• Unlimited access to the LinkedIn Learning library and 22,000+ courses
• Global career opportunities
• Volunteer and community involvement opportunities
• EPAM Employee Groups
• Award‑winning culture recognized by Glassdoor, Newsweek and LinkedIn