Full-stack vs Full Stack, Back-end vs Back end, Front-end vs Front end

orthography

The usual principle is that an attributive adjective gets hyphenated (it was a hard-fought victory), but a predicative adjective does not (the victory was hard fought).

The punctuation usually follows the syllabic stress. Note that in hard-fought victory, there is only one stressed syllable in hard-fought, whereas in the victory was hard fought, there are two stressed syllables in hard fought.

So you'd have front-end system.

The noun phrase front end shouldn't be hyphenated: both words are stressed.

Single word for (shrugging) hands action

Examples of functions where $f(ab)=f(a)+f(b)$

Approximating roots of the truncated Taylor series of $\exp$ by values of the Lambert W function

Let $R$ be a commutative ring with 1 then why does $a\in N(R) \Rightarrow 1+a\in U(R)$?

Is $\frac{\vert x+y\vert}{1+\vert x+y\vert}\leq\frac{\vert x\vert}{1+\vert x\vert}+\frac{\vert y\vert}{1+\vert y\vert}$ true?

Galois Group of $(x^2-p_1)\cdots(x^2-p_n)$

Prove that any continuous integer-valued function of a real variable is constant.

Definite Integral $\int_2^4\frac{\sqrt{\log(9-x)}}{\sqrt{\log(9-x)}+\sqrt{\log(3+x)}}dx$ [duplicate]

The difference between two periodic functions converges to zero, is this two functions identical?

Show that lcm$(a,b)= ab$ if and only if gcd$(a,b)=1$