FluidLabs

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