Identity platform & auth
Canonical user model and cross-system identity strategy, with a central auth service as the single authority for token issuance and validation.
- Python
- Flask
- PostgreSQL
- AWS
Staff Software Engineer
Design and own the platforms products depend on.
Identity and authorization, subscriptions and billing, GDPR workflows — built as shared services across Python backends and AWS infrastructure, with a focus on reliability, observability, and clean integration contracts.
Highlights
GDPR deletion orchestration
Company-wide erasure across internal services and third-party vendors — async workflows with retries, auditing, and verifiable completion.
- Python
- AWS Lambda
- SQS
- EventBridge
Subscriptions & billing platform
Shared platform unifying Google Play, App Store, and web billing behind one API; integrated into the new Forge architecture.
- Python
- Flask
- SQLAlchemy
- PostgreSQL
Experience
Welltech
Staff Software EngineerNov 2022 — Present
- Designed and led the implementation of the company's identity platform — a canonical user model and cross-system identity strategy for web and mobile products.
- Built the centralized authentication service as the single authority for token issuance and validation, replacing duplicated authentication logic across services.
- Designed and implemented the company-wide GDPR deletion orchestration service, coordinating erasure across internal services and third-party vendors with retries, auditing, and completion tracking.
- Owned the shared subscriptions platform unifying Google Play, App Store, and web billing behind a common API; led its integration into the new Forge architecture with entitlement management, notification flows, and analytics.
- Defined integration contracts between new and legacy platforms, enabling gradual migration — with zero-downtime migrations — without disrupting existing products or analytics.
- Designed and maintained AWS infrastructure as code (CDK, CloudFormation) across Lambda, ECS, SQS, EventBridge, and API Gateway, with Datadog-based observability.
- Delivered experimentation infrastructure used by product teams for feature rollouts and A/B testing.
- Python
- TypeScript
- Flask
- SQLAlchemy
- PostgreSQL
- AWS Lambda
- ECS
- API Gateway
- SQS
- EventBridge
- AWS CDK
- CloudFormation
- GitLab CI
- Datadog
- pytest
- mypy
- Ruff
Intive
Backend engineerOct 2021 — Nov 2022
- Refactored a financial accounting system (double-entry) and standardized environments.
- Improved testing (pytest migration) and developer tooling; integrated Plaid and API docs.
- Django
- DRF
- Celery
- PostgreSQL
- Plaid
- Stripe
- Sendgrid
- Swagger
Ivelum
Full-stack engineerJan 2020 — Oct 2021
- Built a developer productivity app with GitHub/Slack integrations, company calendars, and automations.
- Delivered an identity platform providing SSO-style auth tools across products and sites.
- Onboarded entire companies via SAML, OIDC, and OAuth integration flows.
- Worked with trunk-based development and zero-downtime migrations.
- Django
- Celery
- MySQL
- ElasticSearch
- REST
- GraphQL
- React
- AWS
- GitHub API
- Slack API
- SAML
- OIDC
- OAuth
SoftFormance
Full-stack engineerFeb 2018 — Jan 2020
- Built Facebook messaging automation to simulate interactive ads and reply to user messages.
- Delivered a crypto/affiliate platform with KYC onboarding and verification flows.
- Shipped a logistics app with order matching, driver pickup, and Google Maps routing.
- Worked across multiple Django/Celery/PostgreSQL projects plus one Flask/MongoDB stack.
- Django
- Celery
- PostgreSQL
- Flask
- MongoDB
- Angular
- Facebook API
- Google Maps API
- AWS
- Ansible
dvmn.org
Code reviewerSep 2017 — Feb 2022
- Reviewed a high volume of student submissions across synchronous and async lessons.
- Provided detailed, actionable feedback to help students choose approaches and unblock tasks.
- Fed back on curriculum and tasks, suggesting adjustments to improve the learning system.
- Python
- Teaching
- Code review
i-pr.com.ua
Side projectsMay 2017
- Provisioned Linux servers for web deployments, including baseline hardening and updates.
- Established team tooling for PHP delivery (SFTP access, Git workflows, Redmine tracking).
- Optimized web and mail services for performance and deliverability.
- Built a Python parser for
asos.comand integrated imports into OpenCart catalog data.
- Linux
- Python
- OpenCart
- Git
- Redmine
Python development
Learning & practiceDec 2015 — Present
- Built small Python utilities and CLI scripts to automate repetitive work and data processing.
- Developed web scrapers/parsers and normalized extracted data for storage and reporting.
- Improved code quality through refactoring, basic testing, and type hints.
- Python
- Automation
- Parsing
Remote Linux system administration
FreelanceApr 2013
- Administered multiple Linux servers hosting several websites each.
- Provisioning and configuring servers, web services (Apache, Nginx), and databases (MySQL).
- Managing domains and DNS; deploying new sites and updates.
- Setting up and maintaining mail services; keeping deliverability healthy.
- Supporting production systems: troubleshooting, configuration fixes, and performance tuning.
- Handling security issues: patching, access hardening, and anti-spam/anti-malware measures.
- Linux
- Apache
- Nginx
- MySQL
Frontend development
HTML/CSSJul 2012
- Built pages from PSD designs using HTML5 and CSS3.
- HTML5
- CSS3
Skills
Backend
- Python
- Django
- Flask
- Celery
- SQLAlchemy
- REST
- GraphQL
Data & infra
- PostgreSQL
- MySQL
- Redis
- RabbitMQ
- ElasticSearch
- AWS Lambda
- ECS
- SQS
- EventBridge
- AWS CDK
- Docker
Frontend & tools
- React
- Vue
- TypeScript
- Webpack
- pytest
- mypy
- Ruff
- Datadog
- CI/CD
Contact
Best way to reach me: oleg.smedyuk@gmail.com