Kushnir

Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
Daniil Kushnir Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram: @DiKey777
.NET Engineer GitHub: Dikeyzio

ABOUT

Software Engineer with 5+ years building enterprise systems for fintech and audit. Backend in C# / ASP.NET Core, data
layer on Entity Framework Core, Dapper and PostgreSQL, APis over REST and SignalR. Frontend in Angular,
TypeScript and RxJS. Works as backend, frontend, or full-stack depending on the team - from API contract to screen when the
squad is lean. Delivers in Agile: requirements, estimates, implementation, code review, production.

SKILLS

Backend: C#, .NET 5+, .NET Core, .NET Framework, ASP.NET, ASP.NET Core, Entity Framework Core, Dapper, LINQ, async/
await, JSON
Frontend: JavaScript, TypeScript, Angular, RxJS, Angular Signals, Angular Material, Kendo UI, HTML5, CSS3, Sass/ SCSS,
Bootstrap, Tailwind CSS, Webpack
Data: PostgreSQL, SQL, Redis, stored procedures, functions, transactions/ ACID, Code-First migrations
APis: REST, OData, Swagger/ OpenAPI, SignalR, WebSocket, JWT
Tools: Git, GitHub, GitFlow, Docker, GitHub Actions, Postman, ESLint, Prettier, Figma
AI: GitHub Copilot, Cursor, ChatGPT - code review, boilerplate, tests, and refactors in daily work
Other: Scrum, Kanban, pull-request reviews, API design, clean code / refactoring

WORK EXPERIENCE

Tieto - .NET Engineer 10.2021 - Present

Product. Financial Forecasting Platform for a Big 4 client. One system for analysis, forecasting, and approval of ~55
financial metrics across 4 departments (~190 MAU). Replaced 4 departmental workbooks and 2 point tools. One role the
whole time - .NET Engineer on this product. The two blocks below are areas of ownership on the same team, not separate
positions: APis and data first, then realtime, delivery, and the Angular client when the feature needed one owner.

APis & data
• Cut p95 load time of the main forecast grid from 2.3 s to 380 ms by rewriting hot paths in Dapper, adding covering
indexes, and replacing chatty EF queries with 23 tuned PostgreSQL procedures.
• Cut approval of an 8.2k-row batch from 14 s to 2.1 s by moving aggregation into SQL transactions (ACID) and
keeping EF Core Change Tracker for the multi-step write path only.
• Shipped 11 ASP.NET Core controllers/ 34 REST endpoints and integrated 4 upstream systems (ERP extract,
headcount, FX rates, document store), so all 4 departments consumed one contract instead of parallel integrations.
• Modeled 40+ entities with EF Core Code-First migrations, so schema changes shipped with the service instead of ad-hoc
scripts on month-end.
Technologies: C#, ASPNET Core, .NET 5+, Entity Framework Core, Dapper, LJNQ, PostgreSQL, REST, OData, async/await

Realtime, delivery & client
• Dropped redundant dashboard reads by ~71% by replacing 15-second polling with SignalR / WebSocket, keeping the thread
pool stable under ~60 concurrent month-end sessions.
• Cut Sev-2 production tickets on the forecast module from 19 to 11 in the next two quarters (-42%) by refactoring
legacy service and data-access code and tightening API validation.
• Delivered API stories from agreed contract to production in 3-5 working days inside 2-week Scrum sprints with a
team of 7 (reviews, estimates with BAs, release).
• Cut a new approval admin screen from ~11 days to ~6.5 by shipping reusable Angular Reactive Forms controls when the
team had no spare frontend capacity.
Technologies: C#, ASPNET Core, SignalR, WebSocket, Angular, TypeScript, RxJS, Kenda UL Angular Material, Scrum

EPAM - Full Stack Developer 12.2020 - 11.2021

Product. Internal operations web app for an EPAM client team - multi-page UI with CRUD over REST, used by about
45 internal users. Replaced a set of static pages and manual spreadsheets for day-to-day records.

• Shipped 9 pages wired to 6 REST resources (full CRUD and list filters) and set up the local frontend environment so new
screens could talk to the same API contract.
• Cut load of the heaviest list page from 3.2 s to 1.4 s by paginating the list payload and dropping unused CSS/JS on first
paint.
• Implemented shared routing for 7 routes instead of separate HTML files; reviewed UI mock-ups with backend
engineers before build so infeasible layouts did not reach sprint.
• Closed 12 cross-browser layout bugs across Chrome, Firefox, Safari and Edge and tightened spacing/contrast so the same
pages stayed usable on laptop and tablet.
Technologies: JavaScript, HTML5, CSS3, Angular, REST APls

EDUCATION LANGUAGES

Master of Law - Kharkiv University of Economic and Law English - Upper-Intermediate (B2)