![Nikola Milic](https://jobicy.com/react/themes/app/images/avatar.jpg) Nikola Milic # Lead Full-Stack Engineer Open to offers · Member since 4 Aug 2026 [Message](https://jobicy.com/enter4715.php.md) ShareLocationBelgrade, SerbiaDesired salaryUnspecifiedWork preferenceRemote OnlyExperience levelLead * [Overview](#overview) * [Portfolio 0](#portfolio) * [Services 0](#services) ## About Professional summaryI am a Lead Full-Stack Engineer with more than eight years of experience building, supporting, and improving production SaaS, cloud, FinTech, Web3, and AI-enabled platforms. I specialize in resolving complex application, integration, deployment, and access issues. I use incident triage, root-cause analysis, clear escalation processes, and preventative engineering improvements to improve service reliability. I have strong experience developing secure customer and internal workflows using React.js, Node.js, TypeScript, PostgreSQL, REST APIs, AWS serverless services, and CI/CD automation. I work extensively with identity and security concepts including OAuth/OIDC, RBAC, permissions, user provisioning, audit logging, least-privilege access, KYC integrations, and secure transaction workflows. I create maintainable technical documentation such as architecture notes, API references, deployment procedures, runbooks, troubleshooting guides, and reusable implementation standards. I also use AI assistants and OpenAI/Anthropic integrations to improve debugging, implementation, documentation, and structured knowledge retrieval while maintaining security and engineering review standards. ## Skills 34 capabilities[Access Control](https://jobicy.com/talent/access-control.md)[API Documentation](https://jobicy.com/talent/api-documentation.md)[Authentication](https://jobicy.com/talent/authentication.md)[Authorization](https://jobicy.com/talent/authorization.md)[AWS Serverless](https://jobicy.com/talent/aws-serverless.md)[Blockchain](https://jobicy.com/talent/blockchain.md)[Change Management](https://jobicy.com/talent/change-management.md)[CI CD](https://jobicy.com/talent/ci-cd.md)[Cloud Support](https://jobicy.com/talent/cloud-support.md)[Code Review](https://jobicy.com/talent/code-review.md)[Database Design](https://jobicy.com/talent/database-design.md)[Fintech](https://jobicy.com/talent/fintech.md)[Identity Verification](https://jobicy.com/talent/identity-verification.md)[KYC](https://jobicy.com/talent/kyc.md)[Mentoring](https://jobicy.com/talent/mentoring.md)[Monitoring](https://jobicy.com/talent/monitoring.md)[NestJS](https://jobicy.com/talent/nestjs.md)[OAuth](https://jobicy.com/talent/oauth.md)[OIDC](https://jobicy.com/talent/oidc.md)[PostgreSQL](https://jobicy.com/talent/postgresql.md)[Prompt Engineering](https://jobicy.com/talent/prompt-engineering.md)[React](https://jobicy.com/talent/react.md)[Responsive Web Design](https://jobicy.com/talent/responsive-web-design.md)[REST APIs](https://jobicy.com/talent/rest-apis.md)[Role Based Access Control](https://jobicy.com/talent/role-based-access-control.md)[Root Cause Analysis](https://jobicy.com/talent/root-cause-analysis.md)[SaaS Administration](https://jobicy.com/talent/saas-administration.md)[Technical Documentation](https://jobicy.com/talent/technical-documentation.md)[Technical Writing](https://jobicy.com/talent/technical-writing.md)[Troubleshooting](https://jobicy.com/talent/troubleshooting.md)[TypeScript](https://jobicy.com/talent/typescript.md)[User Provisioning](https://jobicy.com/talent/user-provisioning.md)[Web3](https://jobicy.com/talent/web3.md)[Workflow Automation](https://jobicy.com/talent/workflow-automation.md) ## Tech stack & tools Working toolkit ### Collaboration [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/confluence/confluence-original.svg) Confluence](https://jobicy.com/talent?tool=confluence.md)[![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/jira/jira-original.svg) Jira](https://jobicy.com/talent?tool=jira.md) ### Communications [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/slack/slack-original.svg) Slack](https://jobicy.com/talent?tool=slack.md) ### Data Stores [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/postgresql/postgresql-original.svg) PostgreSQL](https://jobicy.com/talent?tool=postgresql.md) ### Development [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/github/github-original.svg) GitHub](https://jobicy.com/talent?tool=github.md) ### Languages & Frameworks [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/nestjs/nestjs-original.svg) NestJS](https://jobicy.com/talent?tool=nestjs.md)[![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/typescript/typescript-original.svg) TypeScript](https://jobicy.com/talent?tool=typescript.md) ## Experience Career history ### Lead Full-Stack Engineer · Endava Feb 2022 – PresentI lead development and production support for Fairmint, an AWS-based SaaS and investment platform with secure user, wallet, transaction, and customer-portal workflows. I investigate application, integration, deployment, and access issues, identify root causes, coordinate fixes, and communicate resolution steps to stakeholders. I implement authentication, authorization, role-based access, audit-conscious transaction flows, and secure third-party integrations. I improve CI/CD, monitoring, release processes, and operational reliability while converting recurring production issues into preventative fixes and documented runbooks. I maintain architecture documentation, API references, deployment procedures, troubleshooting guidance, and reusable implementation standards. I mentor engineers, review technical changes, and use AI assistants and integrations to accelerate debugging, documentation, and knowledge retrieval under appropriate security controls. ### Senior Web3 Full-Stack Engineer · Coinbase Mar 2020 – Feb 2022I worked on a regulated crypto staking platform, developing secure customer workflows for staking, rewards, identity verification, account operations, wallet functionality, and transactions. I automated the customer staking lifecycle, including initiation, status tracking, workflow management, rewards calculation, processing, and customer-facing reward visibility. I integrated KYC services to support compliant onboarding and regulated product access. I contributed to platform architecture, production fixes, operational reliability, and maintainability. I partnered with product, compliance, support, and engineering teams to resolve issues and improve the customer experience. ### Full-Stack Engineer · Sunroom Rentals Oct 2017 – Mar 2020I developed and supported a property rental platform using NestJS, React.js, and PostgreSQL. I built responsive interfaces for rental search, property details, and customer application experiences. I created backend services for listings, user workflows, application logic, and database-driven platform functionality. I designed and maintained PostgreSQL structures for rental listings, user data, workflow state, and operational processes. I supported production fixes, investigated user-reported issues, delivered ongoing platform improvements, and maintained technical documentation. ## Education Learning history ### University of Belgrade Oct 2013 – Sep 2017Bachelor's Degree, Computer Science Focused on computer science, software engineering, databases, algorithms, and web application development. 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