developed and managed 3 teams and different projects:

1) payment service for the platform (integrated a lot of payment systems: H2H, Redirect, Crypto, Terminals, Coupons, Bank Transfers)?

the team: 6 developers, 2 mQA, 1 aQA, 2 DevOps, 2 BA, 1 PM

Achievements:

- made reverse engineering from Erlang and PHP projects

- built the project in Docker, Kuber, AWS

- set up documentation (draw.io, PlantUML), logs, monitoring, alerts, tests

- improved integration speed of a new payment system from 1-2 months to 1 week

- improved stability of all payment system integrations (RCA, retry mechanisms, payment balancer)

- speed up of payment processing (up to x10)

- built clear technical roadmap and fixed it step-by-step

- mentored colleagues (1 junior-senior, 2 middle – senior, 1 senior - lead)

2) custom CRM system microservices

- especially bonus system ?

- 3rd party integrations (Optimove, Unisender, Infobip, Amplitude, Smartico, SMSo)

- affiliate program integration?

the team: 1 TL, 3 developers, 2 mQA, 2 aQA, 2 DevOps, 2 BA, 1 PM

Achievements:

- fixed the most important architectural problems (in code, DB, RMQ)

- built the project in Docker, Kuber, AWS

- set up documentation (PlantUML), logs, monitoring, alerts, tests

- made reverse engineering from legacy GoLang projects

- improved stability of all marketing integrations and bonus processing

- speed up of bonus processing (from 200/s to 5k/s events)

- built clear technical roadmap and fixed it step-by-step

- mentored colleagues (2 middle – senior, 1 frontend - backend)

3) business automation service (e.g. customer journey service)

the team: 1 TL, 2 developers, 2 mQA, 1 aQA, 2 DevOps, 2 BA, 1 PM

Achievements:

- a lot of Q&A sessions with stakeholders, BAs, designers, admin panel frontend developers

- investigated different business rules engines, chose one, built and tested the concept, made a demo (saved minimum 3 months of development)

- won the project development - Erlang (min 6 months for PoC) and PHP (min 5 months for PoC)

- provided technical solution for few stages (PoC, MVP, v1), included all documentation in C4 (PlantUML)

- made PoC in short term with a minimum dev/QA resource (1,5 months)

We used NodeJS, GoLang as a back-endPostgreSQL, MongoDB as databases, Redis as a storage and some cached data.?

We used RabbitMQ for queues and async synchronization between services.

Started on some projects and implemented DDD architecture.

Writing auto-tests NodeJS (Jest, Cucumber)

We used AWS (EC2, ECS, S3, CloudFront, CloudWatch)

Tracing (Jaeger), Monitoring and alerting (Grafana, Kibana, Zabbix)

Our VCS was a GIT (GitLab CI/CD)

We worked and planed in JIRA with SAFe, Portfolio, Agile dashboard, Tempo, Confluence etc.