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Hi, I’m Lucas de Jong, a Senior Full Stack Developer with 10+ years of experience delivering scalable systems across SaaS, e-commerce, and AI-powered platforms. I specialize in Ruby (Rails, Sinatra) and Node.js (Express, NestJS) with a strong backend-first focus, and I enjoy designing cloud-native architectures and distributed systems that perform at scale. I’m motivated by turning complex requirements into robust, high-performance services and mentoring teams to adopt best practices in architecture, CI/CD, and observability. I thrive on building AI-enabled features and seamless frontend experiences that complement solid backend foundations.…Hi, I’m Lucas de Jong, a Senior Full Stack Developer with 10+ years of experience delivering scalable systems across SaaS, e-commerce, and AI-powered platforms. I specialize in Ruby (Rails, Sinatra) and Node.js (Express, NestJS) with a strong backend-first focus, and I enjoy designing cloud-native architectures and distributed systems that perform at scale. I’m motivated by turning complex requirements into robust, high-performance services and mentoring teams to adopt best practices in architecture, CI/CD, and observability. I thrive on building AI-enabled features and seamless frontend experiences that complement solid backend foundations.

Lucas de Jong

Full Stack Developer, Web Developer, Front-End Developer, +2

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Hi, I’m Lucas de Jong, a Senior Full Stack Developer with 10+ years of experience delivering scalable systems across SaaS, e-commerce, and AI-powered platforms. I specialize in Ruby (Rails, Sinatra) and Node.js (Express, NestJS) with a strong backend-first focus, and I enjoy designing cloud-native architectures and distributed systems that perform at scale. I’m motivated by turning complex requirements into robust, high-performance services and mentoring teams to adopt best practices in architecture, CI/CD, and observability. I thrive on building AI-enabled features and seamless frontend experiences that complement solid backend foundations.…Hi, I’m Lucas de Jong, a Senior Full Stack Developer with 10+ years of experience delivering scalable systems across SaaS, e-commerce, and AI-powered platforms. I specialize in Ruby (Rails, Sinatra) and Node.js (Express, NestJS) with a strong backend-first focus, and I enjoy designing cloud-native architectures and distributed systems that perform at scale. I’m motivated by turning complex requirements into robust, high-performance services and mentoring teams to adopt best practices in architecture, CI/CD, and observability. I thrive on building AI-enabled features and seamless frontend experiences that complement solid backend foundations.

Available to hire

Hi, I’m Lucas de Jong, a Senior Full Stack Developer with 10+ years of experience delivering scalable systems across SaaS, e-commerce, and AI-powered platforms. I specialize in Ruby (Rails, Sinatra) and Node.js (Express, NestJS) with a strong backend-first focus, and I enjoy designing cloud-native architectures and distributed systems that perform at scale.

I’m motivated by turning complex requirements into robust, high-performance services and mentoring teams to adopt best practices in architecture, CI/CD, and observability. I thrive on building AI-enabled features and seamless frontend experiences that complement solid backend foundations.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Software Engineer at Photoroom

April 1, 2024 - Present

Architected Rails microservices for image processing pipelines, orchestrated with Sidekiq + Redis, enabling parallel background tasks and cutting processing latency by 22%. Built Node.js services with NestJS to integrate OpenAI Vision API and TensorFlow.js models, powering real-time AI-driven background removal and generative editing. Refactored legacy Rails monolith into event-driven services with Kafka + Protobuf messaging, improving scalability during peak traffic. Implemented image storage strategy with S3 buckets, CloudFront CDN, and signed URLs, reducing bandwidth usage by 18%. Automated infrastructure with Terraform and deployed services on AWS ECS + Fargate, ensuring consistent environment parity across staging/production. Enhanced observability by instrumenting Rails and Node services with Datadog APM + OpenTelemetry traces, cutting average incident resolution time by 35%. Designed and maintained CI/CD pipelines using GitHub Actions, achieving daily production deployments with

Full Stack Engineer at Lokalise

April 1, 2024 - September 19, 2025

Developed Rails modules for translation memory + glossary services, implementing PostgreSQL full-text search and JSONB indexing, improving query speed by 28%. Built Node.js (Express) microservices for real-time event streaming (webhooks + Slack/GitHub/Jira integrations), handling millions of daily events. Re-architected backend to CQRS + event-sourcing pattern using Rails and Kafka, ensuring traceability of translation changes. Designed scalable GraphQL APIs in Node.js for client-facing dashboards, enabling flexible queries with reduced response sizes. Automated deployments with Kubernetes (GKE) + Helm charts, achieving zero-downtime migrations. Integrated AI-based machine translation models (custom TensorFlow services) into Rails backend, boosting translator efficiency by 15%. Created React dashboards for translation project workflows, reusing shared GraphQL queries and Apollo caching. Conducted end-to-end testing with Cypress and backend contract testing using Pact, raising confidenc

Full Stack Developer at Present Connection

July 1, 2020 - September 19, 2025

Engineered Rails SaaS logistics tracking system with geolocation APIs, real-time shipment status updates via WebSockets, reducing support tickets by 20%. Implemented Node.js (Express) APIs for healthcare data exchange with FHIR/HL7 compliance, ensuring HIPAA and GDPR standards. Built Angular and later React frontends consuming Rails APIs, focusing on form-heavy data management interfaces. Containerized all client projects with Docker, introducing GitLab CI/CD pipelines for faster delivery cycles. Designed Azure-based architecture with load-balanced App Services and managed PostgreSQL, scaling to thousands of daily B2B users. Introduced Elasticsearch-backed search into e-commerce projects, cutting product query times by 55%. Automated background processing with Rails ActiveJob + Sidekiq, handling thousands of daily invoicing jobs. Implemented OAuth2 and SAML authentication into B2B solutions, aligning with enterprise integration needs. Optimized Rails ActiveRecord queries and introduced

Front End Developer at Picnic

February 1, 2016 - September 19, 2025

Developed Rails modules for inventory and order lifecycle, including stock validation and route assignment. Built Node.js APIs for real-time delivery tracking, integrating with WebSocket + Redis pub/sub, improving ETA accuracy by 20%. Contributed to internal AngularJS dashboards for operations (delivery monitoring, fleet management). Decomposed Rails monolith into modular services (inventory, delivery, billing), increasing maintainability. Automated deployment pipelines with CircleCI + Docker, enabling feature releases multiple times per week. Designed SQL query optimizations and caching with Redis, reducing DB query times by 25%. Integrated RabbitMQ-based queues for delivery scheduling, smoothing out high-volume order spikes. Collaborated with data team to expose APIs for demand prediction models, improving stock forecasting. Documented scaling strategy with database sharding and service boundaries as user base grew 3x. Supported mobile teams (iOS/Android) by exposing REST APIs for cu

Senior Software Engineer at Photoroom

April 1, 2024 - Present

Architected Rails microservices for image processing pipelines with Sidekiq + Redis, enabling parallel background tasks and reducing processing latency by 22%. Built Node.js services with NestJS to integrate OpenAI Vision API and TensorFlow.js models for real-time AI-driven background removal and generative editing. Refactored legacy Rails monolith into event-driven services with Kafka + Protobuf messaging, improving scalability during peak traffic. Implemented image storage strategy with S3 buckets, CloudFront CDN, and signed URLs, reducing bandwidth usage by 18%. Automated infrastructure with Terraform and deployed services on AWS ECS + Fargate for consistent staging/production parity. Enhanced observability with Datadog APM + OpenTelemetry traces, cutting mean time to resolution by 35%. Designed GraphQL endpoints in Rails to support mobile clients and reduce over-fetching. Conducted stress testing with k6 and JMeter for AI features at 1M+ concurrent image requests. Mentored 6 engine

Full Stack Developer at Lokalise

April 1, 2024 - September 19, 2025

Developed Rails modules for translation memory + glossary services with PostgreSQL full-text search and JSONB indexing, improving query speed by 28%. Built Node.js (Express) microservices for real-time event streaming (webhooks + Slack/GitHub/Jira integrations), handling millions of daily events. Re-architected backend to CQRS + event-sourcing with Rails and Kafka, ensuring traceability of translation changes. Designed scalable GraphQL APIs in Node.js for client dashboards with flexible queries and reduced response sizes. Automated deployments with Kubernetes (GKE) + Helm for zero-downtime migrations. Integrated AI-based translation models (TensorFlow services) into Rails backend, boosting translator efficiency by 15%. Created React dashboards for translation workflows, reused shared GraphQL queries, and implemented Apollo caching. Implemented Redis caching to reduce API latency by 30%. Produced architectural diagrams for onboarding and mentored teammates on Ruby/Node.js modularization

Full Stack Developer at Present Connection

July 1, 2020 - September 19, 2025

Engineered Rails SaaS logistics tracking with geolocation APIs and real-time shipment updates via WebSockets, reducing support tickets by 20%. Implemented Node.js (Express) APIs for healthcare data exchange with FHIR/HL7 compliance (HIPAA and GDPR standards). Built Angular and later React frontends consuming Rails APIs for data-heavy management interfaces. Containerized all client projects with Docker and established GitLab CI/CD pipelines. Designed Azure-based architecture with load-balanced App Services and managed PostgreSQL, scaling to thousands of daily B2B users. Introduced Elasticsearch-backed search for e-commerce projects, cutting product query times by 55%. Automated background processing with Rails ActiveJob + Sidekiq and implemented OAuth2/SAML for enterprise authentication. Optimized Rails ActiveRecord queries and added caching to reduce DB load by ~30%. Documented system architecture with UML/C4 diagrams to improve handovers.

Front End Developer at Picnic

February 1, 2016 - September 19, 2025

Decomposed Rails monolith into modular services (inventory, delivery, billing) and built Node.js APIs for real-time delivery tracking via WebSocket + Redis pub/sub, improving ETA accuracy by 20%. Contributed to internal AngularJS dashboards for operations and later migrated frontend to React. Automated deployment pipelines with CircleCI + Docker, enabling feature releases multiple times per week. Optimized SQL queries and caching with Redis, reducing DB query times by 25%. Integrated RabbitMQ queues for delivery scheduling to smooth spikes, and collaborated with data team to expose APIs for demand forecasting. Authored scaling strategies with database sharding and service boundaries to support 3x growth, and supported mobile teams by providing robust REST APIs.