FluidLabs

At FluidLabs, we are launching a new direction in collaboration with DocuSign — one of the world’s leading players in digital signatures and contract management.
This is a rare opportunity to join a large-scale project and become a top-tier expert across the entire DocuSign product ecosystem, building unique expertise with true global value.


Key responsibilities:

• Design, develop, and maintain back-end services using Node.js and TypeScript
• Build and optimize serverless applications on AWS 
• Work with DynamoDB (data modeling, performance tuning, query optimization)
• Set up monitoring, logging, and alerting via AWS CloudWatch
• Implement and maintain secure authentication/authorization flows with OAuth2/OIDC
• Collaborate with front-end engineers, architects, and product managers to deliver scalable solutions
• Write clean, maintainable, and well-tested code (TDD when possible)
• Participate in code reviews, provide feedback, and ensure high code quality
• Contribute to technical discussions, propose solutions, and share knowledge with the team

• Troubleshoot production issues, optimize performance, and ensure system reliability

   

Must-have technical skills:

• Strong proficiency in TypeScript
• Hands-on experience with Node.js (building and maintaining production-grade applications)
• Proven experience with AWS 

• Solid understanding and implementation of OAuth2 / OIDC (authentication & authorization flows)

   

Nice to have:

• Experience working with DocuSign products and building integrations on top of them
• Hands-on experience with event-driven architectures (SQS, SNS, Kinesis, RabbitMQ, WebSockets)
• Familiarity with broader AWS ecosystem (API Gateway, S3, Step Functions, IAM policies)
• Solid grasp of CI/CD workflows (GitLab CI, GitHub Actions, or similar)
• Knowledge of software design principles (SOLID, DDD, TDD)

• Some exposure to frontend frameworks (React, Next.js) for seamless integration

   

What we offer:

• Long-term collaboration on meaningful projects
• A passionate team with a healthy, positive culture
• Enterprise-level projects with real technical challenges
• Room to grow — both professionally and personally
• Partial tax compensation
• Referral bonuses for successful candidate recommendations
• Paid holidays and time off
   

Work terms:

• Working hours: 11:00–20:00 (Kyiv time)
• Vacation: 24 paid days per year
• Trial period: 3 months
  
   

FluidLabs is building production-grade AI systems and is looking for an engineer experienced in designing and operating LLM-based architectures.

The role requires practical experience with Claude (Opus / Sonnet), prompt architecture, context management strategies, and structured LLM workflows integrated into backend services.

Key responsibilities:

• Design and implement production-grade LLM workflows using Claude (Opus / Sonnet)
• Architect structured prompt systems (system/user/tool separation, multi-step flows)
• Design context management strategies (long-context handling, memory layering)
• Reduce hallucinations through prompt strategy, evaluation loops, and guardrails
• Integrate Claude via API into backend services (Node.js / TypeScript or Python)
• Build RAG pipelines (embeddings, vector search, context injection)
• Design LLM-driven automation (agents, tool calling, workflow orchestration)
• Evaluate and improve response quality through structured testing
• Optimize performance, latency, and cost efficiency
• Collaborate with backend and architecture teams to embed AI into real systems
   

Must-have technical skills:

• 4–5 years of backend engineering experience (Node.js or Python)
• Hands-on production experience with Claude (Anthropic API)
• Strong understanding of:
  • Prompt architecture
  • Context construction and management
  • Multi-step reasoning flows
  • LLM limitations and hallucination patterns
     
• Experience integrating LLM APIs into backend systems
• Understanding of RAG concepts and embeddings
• Experience working with structured JSON outputs and tool-calling patterns
• Ability to explain architectural trade-offs clearly
   

Nice to have:

• Experience building AI agents or autonomous workflows
• Familiarity with vector databases (pgvector, Pinecone, Weaviate)
• Experience with AWS (Lambda, API Gateway)
• Experience in multi-tenant SaaS systems
• Understanding of AI safety and PII handling

What we offer:

• Opportunity to shape a new DocuSign-focused platform from the ground up
• High level of technical ownership and architectural influence
• Enterprise-level projects with real architectural and scalability challenges
• Long-term collaboration on meaningful projects
• A passionate team with a healthy, positive culture
• Enterprise-level projects with real technical challenges
• Room to grow — both professionally and personally
• Referral bonuses for successful candidate recommendations
• Paid holidays and time off
   

Work terms:

• Working hours: 11:00–20:00 (Kyiv time)
• Vacation: 24 paid days per year
• Trial period: 3 months

At FluidLabs, we are launching a new strategic direction in close collaboration with DocuSign - one of the world’s leading platforms for digital signatures and contract lifecycle management.

This role goes beyond pure implementation. You will own backend architecture, drive technical decisions, and help shape a scalable, secure DocuSign-based platform with global impact.

It is a rare opportunity to become a deep domain expert across the DocuSign ecosystem while working on enterprise-grade, real-world systems.


Key responsibilities:

• Own and design the overall backend architecture for DocuSign-based integrations and services
• Define architectural standards, patterns, and best practices across Node.js / TypeScript services
• Design and evolve serverless architectures on AWS (Lambda-first approach)
• Make high-level technical decisions around:
  • service boundaries and APIs
  • data modeling and access patterns (DynamoDB)
  • synchronous vs asynchronous communication
• Design secure, scalable OAuth2 / OIDC authentication and authorization flows
• Develop integration strategy with DocuSign APIs, webhooks, and third-party systems
• Ensure system scalability, reliability, security, and cost efficiency
• Set up and improve observability: logging, metrics, alerts (AWS CloudWatch)
• Review code and architecture decisions, provide technical guidance and mentorship
• Collaborate closely with frontend engineers, product managers, and stakeholders
• Proactively identify technical risks and drive long-term system improvements
• Troubleshoot complex production issues and guide root-cause analysis
   

Must-have technical skills:

• Strong proficiency in TypeScript and backend application design
• Extensive experience with Node.js in production environments
• Proven experience designing and running serverless architectures on AWS Lambda
• Deep understanding of AWS DynamoDB (NoSQL data modeling, performance tuning, scaling strategies)
• Solid experience with AWS CloudWatch (logs, metrics, alarms, observability)
• Strong understanding and hands-on implementation of OAuth2 / OIDC
• Ability to design secure, fault-tolerant, and maintainable backend systems
• Experience making architectural trade-offs and explaining them clearly
   

Nice to have:

• Hands-on experience with DocuSign APIs and enterprise integrations
• Experience with event-driven architectures (SQS, SNS, Kinesis, RabbitMQ, WebSockets)
• Broad AWS knowledge (API Gateway, S3, Step Functions, IAM, ECR/EKS is a plus)
• Experience designing multi-tenant SaaS platforms
• Strong understanding of security best practices for cloud-native systems
• Solid CI/CD experience (GitHub Actions, GitLab CI, or similar)
• Knowledge of software design principles (SOLID, DDD, TDD)
• Ability to mentor engineers and raise overall technical quality
• Some exposure to frontend frameworks (React, Next.js) for end-to-end thinking
  
   

What we offer:

• Opportunity to shape a new DocuSign-focused platform from the ground up
• High level of technical ownership and architectural influence
• Enterprise-level projects with real architectural and scalability challenges
• Long-term collaboration on meaningful projects
• A passionate team with a healthy, positive culture
• Enterprise-level projects with real technical challenges
• Room to grow — both professionally and personally
• Referral bonuses for successful candidate recommendations
• Paid holidays and time off
   

Work terms:

• Working hours: 11:00–20:00 (Kyiv time)
• Vacation: 24 paid days per year
• Trial period: 3 months