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Denis
Ivanov

Average Review
0.00
Reputation
21
Finished gigs
0
Finished jobs
0
Website
heaven8.com
Country
Not specified
Skills
Web, Mobile & Software Dev
IT & Networking
Mobile Apps
Back End Developer
Desktop Applications
Specialization
iOS / macOS Developer (Swift, SwiftUI) + DevOps
Hourly rate
$45/hr
Preferred payment options
Ethereum
USDT
USDC
BNB Chain
USDT
USDC
Polygon
USDT
USDC
Fantom
USDC
Arbitrum
USDT
USDC
Optimism
USDT
USDC
Base
USDC
About me
iOS and macOS developer (Swift 6, SwiftUI, StoreKit 2, SwiftData) with 10+ years in DevOps and infrastructure. I ship apps end to end: code, App Store releases, CI/CD and the backend behind them. Three of my apps are live on the App Store: Finsumo, a multi-currency and crypto expense tracker; Balance Burn, a StoreKit 2 app that zeroes an Apple Account balance; and ShotSumo, a native macOS screenshot tool. Links and screenshots are in the Portfolio tab. I also built Sigma9 Wallet, a gasless self-custody USDC/USDT wallet for Chrome. On the infra side I work with Kubernetes, Terraform, GitHub Actions, GitLab CI, Cloudflare and monitoring, so your app gets a backend that stays up. Most of my career has been in crypto and fintech.

Work experience

Crypto media platform (NDA)
January 2025 – July 2026
Job title
Senior DevOps Engineer
Work experience & achievements
High-load crypto media platform, about 5M unique visitors a day. Self-managed Kubernetes (moved from Kubespray to kubeadm, Cilium eBPF CNI, Longhorn, ingress-nginx, Kong). Terraform/Terragrunt and Ansible across Hetzner, AWS, DigitalOcean, Vultr, OVH/OpenStack and others. GitOps with ArgoCD + ApplicationSet and a shared in-house Helm chart; automated test environments. GitLab CI and GitHub Actions shared templates. Cloudflare DNS, LB, WAF, Workers, R2, Zero Trust. Monitoring with Prometheus, VictoriaMetrics, Grafana, Loki, Vector, ClickHouse. PostgreSQL (CloudNative-PG), ClickHouse, Redis, OpenSearch, MinIO; RabbitMQ, Kafka, NATS; Vault, Consul mTLS, Teleport, WireGuard.
Crypto trading and liquid staking company (NDA)
April 2023 – January 2025
Job title
Senior DevOps Engineer
Work experience & achievements
Infrastructure for a crypto trading and liquid staking company. Launched projects from scratch with Terraform and Ansible, moved services to AWS and Alibaba Cloud. AWS network architecture: VPC, Transit Gateway, site-to-site VPN, PrivateLink. Automated monitoring of the existing infrastructure with Prometheus, Grafana and ClickHouse. Servers for in-house trading bots. Deployed and ran blockchain nodes: TON, Optimism, Aurora and others. Kubernetes (kubeadm, Cilium, Longhorn), ArgoCD, Vault, Consul mTLS, Teleport.
Crypto exchange (NDA)
March 2021 – April 2023
Job title
Senior DevOps Engineer
Work experience & achievements
Raised the maturity of existing crypto exchange projects. Launched projects from scratch with Terraform and Ansible, moved services to Hetzner and DigitalOcean. CI/CD pipelines on GitLab and GitHub Actions. Nomad + Consul service discovery with better resource usage. Containerized, deployed and ran 30+ blockchain nodes: BTC, ETH, SOL, ADA, DOT, XMR, TRX and more. Monitoring and logs with Prometheus, Zabbix, Grafana, Loki, ELK, ClickHouse. Vault, Consul mTLS, Teleport, FreeIPA, Harbor.
EU-regulated crypto exchange (NDA)
September 2019 – February 2021
Job title
Senior DevOps Engineer
Work experience & achievements
Took a legally regulated (EU) crypto exchange from zero to multi-stage and production: 4 environments, 50+ applications. Automated deployment of internal apps with 100+ Ansible roles. Worked closely with development and QA. Monitoring with Prometheus, Zabbix, Grafana, ClickHouse. Stack: Ansible, GitLab, Vault, Consul, PostgreSQL, ClickHouse, MySQL, Redis, Kafka, MinIO, Nexus, Harbor, Sentry, Graylog, ELK, Loki, WireGuard, Hetzner Cloud, AWS, Bitcoin node.
Fintech lending company (NDA)
June 2018 – August 2019
Job title
DevOps Engineer
Work experience & achievements
Deployment of Ruby on Rails applications with Capistrano and Ansible. Built the multi-stage test environment. Monitoring and logs with Zabbix, ELK, Grafana, TICK. Documented deployment, monitoring and logging processes. Personal data protection compliance audit. Stack: Ansible, Vault, Keycloak, FreeIPA, MinIO, Nginx, Redis, RabbitMQ, Sentry, GitLab, Docker.
Payment processing company (NDA)
March 2016 – June 2018
Job title
Senior System Administrator
Work experience & achievements
Payment processing, card issuing and acquiring. Passed PCI DSS 3.1 audits several times. Migrated servers from Oracle Linux 6 to CentOS 7 / Oracle Linux 7, network segmentation, SIEM security monitoring, availability monitoring standards. Stack: Oracle RAC, Oracle WebLogic, PostgreSQL, MariaDB, Docker, Ansible, ELK, TICK, Grafana, Zabbix, Bacula.

Education

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