Edvard Grei

• Delivered the multi-tenant invoice automation platform its enterprise clients run on, Mercedes-Benz among them: 50+ tenants, from a scanned document or inbound email through issuer and tenant resolution to an approved payment. First production workflow shipped within 6 months of joining.
• Moved the company off-premise onto AWS, building the foundation it now runs on and migrating the first 5 of its 30+ ERP modules: infrastructure as code with Terraform, containerization onto Amazon EKS on EC2 node groups with ECR, S3, SQS and SNS, IAM and Route 53, CI/CD on self-hosted GitLab, and the operational model a legacy on-premise organization had never had. Owned the migration path and target architecture, and coached a senior engineer through it so the cloud knowledge did not leave with me.
• Took a 15-person team of legacy Uniface developers from no Git and no Java to Spring Boot, SOLID design, and a two-week release cadence. Introduced SonarQube as an enforced quality gate that cut code-quality violations by more than 60%, established code review, written architecture decisions and runbooks as the default, and trained a team member into a UI/UX and Figma role so requirements were settled in design first, rather than reworked after implementation.
• Made the case to leave the Vaadin monolith for microservices and micro-frontends, carried it against internal resistance, and delivered the services into production, then restructured that single team into a 4-engineer frontend team, a backend team, and a dedicated product manager and designer. Owned the backend foundation throughout: domain-driven design for the service boundaries, hexagonal architecture inside each service, the REST API gateway as single ingress, schema-per-tenant isolation for 50+ tenants on Flyway migrations, and a transactional outbox with idempotent handling so a redelivered invoice never double-pays.
• Replaced brittle user-defined regex extraction with a bounding-box annotation system built on both sides, Java on the backend and TypeScript on the front: a user marks the fields on a PDF once and every similar invoice afterward is extracted automatically. Later migrated detection to AWS Textract and trained a YOLOv8 model, shipped as its own Python/FastAPI microservice, to read the marker barcodes separating documents in a scanned batch that Textract could not handle.
• Designed and built the visual workflow engine on canvas (fabric.js and TypeScript) that routes every invoice: conditional branching on value thresholds, with department, privilege, and hierarchy-aware approval chains ending in payment. Built the Angular front end for the workflow and PDF tooling on top of it.

Ongoing contract engagement covering mobile delivery, backend architecture, and team enablement, across the company's own platform and its client work.

• Direct client work (May 2020 – Dec 2020): technical consulting and remediation on existing web and mobile systems, resolving architecture, data flow, and integration problems.
• Digitex (Jan 2021 – May 2021): owned delivery of the Android client for Blockster, the company's crypto social platform, shipped ahead of a public testnet launch the company had built a 300,000-name waitlist for. Mentored the backend team into mobile development and advised on infrastructure design, going deep on Kubernetes, load balancing, and database sharding. Supervised an iOS developer alongside a PHP/Laravel backend team.
• Crypto-to-fiat platform (Jun 2021 – Feb 2022): supported the engineering team building a platform trading directly with Ukrainian exchanges. Taught and applied domain-driven design, hexagonal architecture, and microservices, designed the transaction pipeline, and advised on the team structure needed to build and run it.

Founded a mobile product studio and shipped two native applications end to end, from backend and infrastructure through design, store release, and user acquisition.

• Shipped two native applications to the stores end to end: MoneyLeft (iOS, Swift with UIKit and SwiftUI), a personal affordability calculator, and Randy (Android, Kotlin), a film recommender over a curated title database.
• Built both backends in Kotlin and Spring Boot on PostgreSQL, three years before Kotlin became the day job, and ran the infrastructure on Google Cloud: Compute Engine, Cloud Storage, Cloud DNS, Cloud IAM and Artifact Registry across dedicated build and application servers. Evaluated GKE and dropped it on cost at that scale.
• Evaluated direct bank-account integration for MoneyLeft and ruled it out on licensing and regulatory grounds rather than building toward a path that could not ship. Owned design, store presence, and acquisition throughout.

Found and delivered my own clients while completing a medical degree, building websites and web applications for small businesses across Kyiv and ranking them on Google.

• Built the booking platform for Lama Lash in Kyiv (Spring Boot and JSP) with client booking and employee scheduling, setting up continuous integration for the first time, and later a barbershop booking system with a separated backend and frontend. Worked across the stacks the clients came with, PHP and WordPress on MySQL alongside the JVM work.
• Integrated PrivatBank24 and, in 2018, Monobank payments into client platforms, and built the business systems around them: CRM, CMS, and accounting and financial management tools for beauty, barbershop and auto-service clients. Most of the direct work came by referral.
• Ranked client sites onto the first page of Google, part of the 100+ ranked across my career: on-page optimization, backlink building, and paid acquisition. Worked as a subcontractor to SEOMID, a Ukrainian SEO agency, on client sites including the training provider Kursor, the online travel agency Advant, and the airline SkyUp, alongside my own direct clients.