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Senior Backend Engineer with 9 years of experience designing, scaling, and maintaining high-throughput distributed systems, enterprise SaaS platforms, and event-driven microservices. Specialized in the Node.js/TypeScript ecosystem, NestJS, and scalable monorepo architectures (Nx), with proven ability to lead backend architecture and execute complex third-party integrations. Led security-critical backend architecture for a cryptocurrency financial ecosystem and built B2B SaaS management platforms from scratch. Experienced integrating institutional-grade providers (e.g., Fireblocks and compliance/KYC vendors), optimizing cloud-native data layers, and improving build/deploy pipelines for production efficiency.…Senior Backend Engineer with 9 years of experience designing, scaling, and maintaining high-throughput distributed systems, enterprise SaaS platforms, and event-driven microservices. Specialized in the Node.js/TypeScript ecosystem, NestJS, and scalable monorepo architectures (Nx), with proven ability to lead backend architecture and execute complex third-party integrations. Led security-critical backend architecture for a cryptocurrency financial ecosystem and built B2B SaaS management platforms from scratch. Experienced integrating institutional-grade providers (e.g., Fireblocks and compliance/KYC vendors), optimizing cloud-native data layers, and improving build/deploy pipelines for production efficiency.

Leutrim Osmani

Back-End Developer, Full Stack Developer, Blockchain Developer, +2

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Senior Backend Engineer with 9 years of experience designing, scaling, and maintaining high-throughput distributed systems, enterprise SaaS platforms, and event-driven microservices. Specialized in the Node.js/TypeScript ecosystem, NestJS, and scalable monorepo architectures (Nx), with proven ability to lead backend architecture and execute complex third-party integrations. Led security-critical backend architecture for a cryptocurrency financial ecosystem and built B2B SaaS management platforms from scratch. Experienced integrating institutional-grade providers (e.g., Fireblocks and compliance/KYC vendors), optimizing cloud-native data layers, and improving build/deploy pipelines for production efficiency.…Senior Backend Engineer with 9 years of experience designing, scaling, and maintaining high-throughput distributed systems, enterprise SaaS platforms, and event-driven microservices. Specialized in the Node.js/TypeScript ecosystem, NestJS, and scalable monorepo architectures (Nx), with proven ability to lead backend architecture and execute complex third-party integrations. Led security-critical backend architecture for a cryptocurrency financial ecosystem and built B2B SaaS management platforms from scratch. Experienced integrating institutional-grade providers (e.g., Fireblocks and compliance/KYC vendors), optimizing cloud-native data layers, and improving build/deploy pipelines for production efficiency.

Available to hire

Senior Backend Engineer with 9 years of experience designing, scaling, and maintaining high-throughput distributed systems, enterprise SaaS platforms, and event-driven microservices. Specialized in the Node.js/TypeScript ecosystem, NestJS, and scalable monorepo architectures (Nx), with proven ability to lead backend architecture and execute complex third-party integrations.

Led security-critical backend architecture for a cryptocurrency financial ecosystem and built B2B SaaS management platforms from scratch. Experienced integrating institutional-grade providers (e.g., Fireblocks and compliance/KYC vendors), optimizing cloud-native data layers, and improving build/deploy pipelines for production efficiency.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Albanian

Fluent

Work Experience

Lead Backend Engineer at Webchain

May 1, 2025 - Present

Designed and scaled backend systems for a high-security cryptocurrency financial ecosystem. Architected a multi-tenant B2B SaaS management platform using NestJS, TypeScript, and PostgreSQL. Built a custom crypto-orchestrator pipeline to dynamically calculate, lock, and deduct digital asset balances to settle real-time fiat card processing. Led an Nx monorepo migration across compliance, crypto-orchestrator, and fiat-pay services, improving compilation/test runtime performance using SWC-backed test runs. Streamlined production build pipelines with custom Nx executors to isolate deployable assets and reduce Docker image sizes. Integrated Fireblocks TS SDK for institutional-grade wallet generation, asset synchronization, and multi-party transaction signing workflows. Developed reusable core modules (e.g., OpenPayd, pubsub, redis, SumSub) to standardize banking rails, KYC/AML checks, and decouple pub/sub messaging across the monorepo.

Senior Backend Developer (Contract) at Fluz

December 1, 2024 - March 1, 2025

Owned a critical high-load backend initiative ahead of a major product release. Built a flexible "Challenges" system for user engagement and progression using optimized relational schemas. Implemented invite-based progression and referral rewards with customizable reward types. Developed REST APIs with scalability under load using Redis caching. Collaborated with frontend and mobile teams to ensure contract alignment and reduced integration friction. Resolved production issues and architectural bottlenecks under strict timelines while enforcing code quality standards via Jest, ESLint, and Prettier.

Senior Backend Developer at Fluz

December 1, 2024 - March 1, 2025

Contract role leading a critical high-load backend initiative ahead of a major product release. Built an engagement-oriented Challenges system using flexible relational schemas. Implemented invite-based progression and referral rewards with customizable reward types. Developed optimized REST APIs with scalability and performance improvements using Redis caching. Coordinated with frontend and mobile teams to minimize API integration friction. Resolved production incidents and architectural bottlenecks under tight timelines.

Senior Backend Developer (Contract) at Proxify

June 1, 2023 - May 1, 2025

Led backend development for a health-focused application (micronutrient diet optimization) with data-driven recommendations. Implemented secure role-based authentication/authorization with Supabase (PostgreSQL) and built low-latency Edge Functions for real-time processing. Integrated enterprise third-party APIs including DHL for real-time package tracking and Open Health for real-time blood test results, ensuring secure synchronization. Delivered backend integration with an external Svelte frontend and mentored engineering team members on system design best practices.

Backend Developer at Clean Cycle (Cause Health, Germany)

June 1, 2023 - May 1, 2025

Led backend development for a health-focused app providing personalized, data-driven micronutrient diet recommendations. Architected and optimized database solutions using Supabase (PostgreSQL). Implemented secure role-based access control. Developed low-latency algorithms using edge functions for real-time processing. Integrated third-party enterprise APIs (DHL tracking and Open Health blood test results) and ensured secure synchronization. Built backend integration with a Svelte frontend and mentored team members on system design.

Senior Backend Developer at Proxify

June 1, 2023 - May 1, 2025

Contract backend development for multiple projects. Delivered secure role-based authentication/authorization and optimized database solutions with Supabase (PostgreSQL). Implemented low-latency edge functions for real-time data processing. Integrated enterprise APIs (e.g., DHL tracking and Open Health blood test results) with secure data synchronization. Mentored engineers on system design best practices.

Backend Developer at Droppie

January 1, 2023 - October 1, 2023

Engineered cloud backend infrastructure for an environmentally focused mobile app incentivizing community waste collection. Built scalable REST APIs with Node.js and optimized complex MongoDB schemas. Managed production deployments on Google Cloud Platform using Cloud Run and Cloud Functions. Implemented telemetry and distributed error tracking orchestration using GCP Cloud Logging.

Backend Developer at Kutia

June 1, 2022 - October 1, 2023

Contributed to backend architecture and API development for an enterprise healthcare app using NestJS and TypeORM. Integrated and optimized compliance-driven third-party APIs (PointClickCare and MediMatrix). Tuned PostgreSQL and SQLite performance to reduce latency. Built cron jobs and background scripts to maintain integrity of synced external datasets. Led complex migrations during project updates with custom scripts to achieve seamless, zero-downtime transitions.

Backend Developer at Butler Hospitality

March 1, 2020 - June 1, 2022

Redesigned a hospitality platform API by migrating from a legacy monolith to a modular Express.js architecture. Implemented event-driven microservices routing production traffic via AWS API Gateway to improve fault tolerance and efficiency. Developed flexible polymorphic database schemas for real-time adjustments to menus and logistics. Secured public endpoints by modernizing authentication workflows with enterprise-grade OAuth2.

Backend Developer at Hybrid Valley

February 1, 2017 - February 1, 2020

Developed scalable backend solutions and REST APIs using Node.js and Express.js. Built serverless infrastructure on AWS with Serverless Framework for decoupled background processing and event workflows. Implemented and optimized relational and NoSQL databases (MySQL, PostgreSQL, MongoDB, DynamoDB). Automated operational workflows with custom scripts. Implemented Kafka-based messaging infrastructure using AWS MSK to enable event-driven communication between Node.js microservices on EC2. Established observability and alerting with AWS CloudWatch for serverless endpoints.