Senior Backend Engineer – Typescript (.Nodejs) / AWS

Role Overview

Varicent is seeking a Senior Software Developer, GenAI to build and scale production-grade AI systems that directly impact customer product experience. You will contribute to the delivery of GenAI-powered features, collaborating with technical leads, and ensuring technical quality, reliability, and scalability within a core product area. This role is ideal for a strong individual contributor focused on hands-on development, learning new technologies, and transforming ideas into high-quality production systems.

What You'll Do

• Build and maintain product features and supporting backend components, including services, integrations, and internal workflows.
• Write production-ready code and lightweight prototypes for rapid idea validation.
• Create automated tests and proactively fix issues to ensure release stability, as engineers own quality without a dedicated QA function.
• Support proof-of-concepts and experiments by setting up test cases, reviewing results, and improving weak areas.
• Document systems and workflows for maintainability and extensibility.

GenAI Competencies You'll Practice

• Translate business problems into clear AI tasks and implement end-to-end solutions with guidance.
• Prepare and maintain data and test cases for output quality measurement.
• Apply common AI application patterns such as prompting, using internal knowledge sources, and calling external tools or APIs.
• Measure quality using repeatable evaluation methods, including automated checks and structured human review.
• Contribute to production readiness through versioning, monitoring, basic performance and cost awareness, and usage tracking.
• Adhere to privacy, security, and compliance requirements in collaboration with Legal and Security teams.

How We Work

• Balance exploration with delivery: test ideas quickly, then productionize successful ones.
• Achieve "done" by meeting quality goals, followed by continuous improvement in accuracy, cost, and performance.
• The team owns systems end-to-end, including build, release, and operational reliability.

What You Bring

• 5+ years of backend or full-stack engineering experience with a strong backend focus.
• 4+ years working with Typescript / Node.js / C#.
• Advanced experience with AWS (EC2, EKS, Lambda, S3, DynamoDB, RDS, Step Functions, etc.).
• Proven experience working with large datasets, distributed computing, and batch or stream processing using Spark, Dask, EMR, Glue, Kafka, etc.
• Solid understanding of system design, distributed systems, scalability patterns, and cloud architecture.
• Strong interest in learning and applying GenAI technologies in practical, production environments.

Nice to Have

• Hands-on experience with GenAI/LLMs, including prompt engineering, retrieval/RAG, embeddings, tool/function calling, fine-tuning, or evaluation pipelines.
• Familiarity with LLMOps practices (experiment tracking, version control for prompts/models, cost/latency optimization).
• Experience with tools like LangChain/LangGraph, OpenAI, Anthropic, Azure OpenAI, and vector databases (Pinecone, FAISS, Milvus).
• Contributions to open source, technical blogs, or conference talks.

Education

• Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.

Important Notes

• This role requires employees to work within Eastern Standard Time (EST) business hours. Candidates outside EST will need to adjust their working hours.
• This position is fully remote.

Benefits

• Market Leading Compensation Package.
• Wellness Programs to Support Health and Wellbeing.
• Working with the latest tools and technologies in a fast-paced environment.
• Remote Work Flexibility.
• Comprehensive Employee Insurance Coverage: Medical, Dental, Vision, Life Insurance.
• Annual Time Off: Provided in accordance with applicable legislative requirements.
• Global Connected Culture: Hubs in Romania, UK, US, Canada.
• Dynamic Work Culture: Innovative and multicultural environment.
• Grow with Us: Continuous development opportunities.