Олександр

Oleksandr Holikov
Node.js Backend Developer

l i n ke d i n .co m / i n / h o l i kovo l e ks a n d r

g i t h u b.co m / H o l i kovO l e ks a n d r

s a nya g o l i kov 97@ g m a i l .co m

t . m e / Le s _ H o l i kov

[open contact info](look above in the "contact info" section)

Ky i v, U kra i n e

Technologies

B a cke n d :

 C I /C D :



N o d e . j s , N e s t J S , Ex p re s s . j s
G i t H u b Ac t i o n s

D a t a ba s e s :

 C l o u d :



Po s tg re S Q L , M yS Q L , Ty p e O R M
AWS ( E C2 , S3 , I A M ) , F i re ba s e

I n f ra s t r u c t u re :

 Ve r s i o n Co n t ro l :



L i n u x , N g i n x , D o cke r, D o cke r Co m p o s e Git

Experience

F re e l a n ce p ro j e c t · 2024

B a cke n d D e v e l o p e r / N e s t .js

Enhanced and refactored an existing Nest.js backend API

Implemented new REST endpoints according to business requirements

Worked with SQL database: queries, relations, and data consistency

Improved API performance and stability

Fixed bugs and edge cases in existing business logic

Added input validation and error handling

Ensured code readability and maintainability

Delivered changes within agreed timelines

Projects
CRM B a cke n d API ( p e r s o n a l p ro j e c t)

N o d e .j s / N e s t JS / P o s t g re SQL

Desi g n e d a n d i mp l e m e n te d a C RM- s t y l e ba cke n d API

U s e r , s t a f f , a n d a pp o i n t m e n t /s e s s i o n m a n a g e m e n t

JWT a u t h e n t i c a t i o n a n d ro l e - ba s e d a cce s s co n t ro l

REST AP I w i t h v a l i d a t i o n a n d e rro r h a n d l i n g

P o s t g re SQL + Typ e ORM ( e n t i t i e s , re l a t i o n s , m i g ra t i o n s )

D o cke ri z e d s e t u p fo r l o c a l d e v e l o pm e n t


B a s i c C I /C D w o rk fl o w