How to break into security engineering

The most reliable way into security engineering is to start as a software engineer and move sideways into application security. At a startup, the first security hire is almost always an appsec or product-security generalist who can read code, fix it, and ship guardrails, not a compliance specialist or a SOC analyst. If you can already write and review code, you are most of the way there. The rest is learning how systems break and proving you can reduce that risk without slowing the team down.

This post is about the engineering route into security: the sub-fields, the skills and certs that actually move a resume, where the demand is at venture-backed startups, what the comp looks like, and a concrete first 90 days. If you are weighing security against other tracks, read platform and infrastructure engineering careers and how to become a staff engineer alongside this one.

What does a security engineer actually do?

Security engineering is not one job. The title covers several distinct disciplines, and the one that hires the most generalists is application security. Knowing which lane you are aiming at changes what you study and what roles you apply to.

The through-line is the same for all of them: you reduce the chance and cost of a breach. The fastest entry point for a working engineer is appsec, because the core skill (reading code and spotting what an attacker would abuse) is an extension of code review you already do.

What skills get you hired into appsec?

Two engineers apply for the same junior appsec role. One has memorized the OWASP Top 10 as a list. The other can take a pull request and explain, in the diff, where an attacker injects, what they get, and how to fix it without breaking the feature. The second one gets the offer. Security hiring rewards demonstrated reasoning over vocabulary.

Here is the foundation, roughly in the order it pays off:

• Real software engineering. You cannot secure code you cannot read. Comfort in at least one backend language, plus HTTP, auth flows, and how a request travels from browser to database, is the floor.
• The web attack surface. Injection (SQL, command, template), broken access control, SSRF, auth and session flaws, and how each one looks in actual code. Work through the OWASP Top 10 and the OWASP ASVS as a checklist you can apply, not recite.
• Hands-on practice. PortSwigger Web Security Academy is free, deep, and the closest thing to a standard curriculum. Finishing the labs is a credible signal on its own.
• Cloud and identity basics. IAM, least privilege, secrets management, and how an over-permissioned role turns a small bug into a full compromise. Most startup breaches are identity and config, not exotic exploits.
• Cryptography literacy, not invention. Know when to use TLS, hashing, and a vetted library, and know never to roll your own. You need judgment, not a number theory degree.
• Writing. A security finding nobody acts on is worthless. Clear, specific writeups that an engineer can fix in an afternoon are a real differentiator.

For more on packaging this on paper, see resume tips for startup engineers. The single most useful artifact is a public writeup: a vulnerability you found in an open-source project (reported responsibly), a CTF solution, or a deep blog post on one bug class. It shows the reasoning that a bullet list cannot.

Do you need security certs?

For the engineering track at startups, certs are a tiebreaker at most, not a gate. A founder hiring their first security person cares whether you can read their codebase and reduce real risk this quarter. A clean portfolio of writeups and finished PortSwigger labs beats a wall of acronyms. That said, some certs do carry weight, and they sort by lane.

If you are an engineer with limited time, skip the survey certs and spend that energy on a portfolio plus OSCP if you want offensive credibility. Certifications open doors at larger companies with checkbox HR filters. Startups, the kind you find on roles.cc, index much more on what you can show.

Is there real demand for security engineers at startups?

Yes, and the trigger is usually predictable. A startup hires its first security engineer when one of three things happens: it raised a round and now has budget and a bigger attack surface, an enterprise customer demands SOC 2 before signing, or it had a scare. The funding trigger is why funding recency is worth watching. A company that just closed a Series A and sells to enterprises is far more likely to open a security role in the next two quarters than one that raised three years ago.

You can watch this directly. The recent raises page sorts companies by how recently they closed, and the main board lists engineering roles pulled from each company's own job site. Fintech, developer tools, and any company handling regulated data or payments tend to hire security earliest. See which startup sectors are hiring engineers for where the volume is.

What does a security engineer get paid?

At venture-backed startups in San Francisco and New York, security engineering comp tracks closely with senior software engineering, often a few points higher because the talent pool is thinner. The ranges below are illustrative, not advice, and depend heavily on stage, level, and leverage.

The first security hire at a funded startup often lands a senior title and meaningful equity because the role is high-trust and hard to fill. For how to read the equity half of the offer, see how to evaluate a startup job offer and senior software engineer salary in SF and NYC for 2026, which sets the baseline security comp builds on.

How do you get the first role with no security title?

Most people break in without ever holding the word security in a previous job title. The two reliable on-ramps are internal moves and proof-of-work.

1. 01The internal pivot. You are already a software engineer somewhere. Volunteer for security work: own the dependency upgrades, fix the findings from the last pentest, write the threat model for a new feature, run the SOC 2 evidence collection. Do this for two quarters and you have a real security track record and an internal reference. This is the lowest-risk path and the most common.
2. 02The external proof-of-work jump. No security work available at your job? Build a public record instead. Finish the PortSwigger labs, place in a CTF, report a real CVE responsibly, or write a sharp teardown of one vulnerability class. Then apply directly to startups hiring their first or second security engineer, where managers read portfolios instead of filtering on titles.

Either way, you are converting general engineering credibility into specific security credibility. A recruiter who knows the funded companies can route you to the ones opening security roles right now. That is the whole point of dropping your resume with us: founders who just raised tell us what they need, and we match against it. On the question of whether to work with a recruiter at all, see do you need a recruiter as a software engineer.

What do the first 90 days look like?

If you are the first or second security hire at a startup, do not arrive with a 40-control compliance framework on day one. The team will route around you. The job in the first quarter is to earn trust by reducing real risk fast and making secure the easy path, not the slow one.

• Weeks 1 to 3: map the attack surface. Read the codebase, the cloud account, and the auth model. Find the crown jewels (customer data, payment flows, admin access) and how someone would reach them. Write it down.
• Weeks 3 to 6: kill the worst few things. Pick the two or three findings with the highest blast radius (an exposed secret, an over-permissioned IAM role, a missing access-control check) and fix them with the owning engineers. Visible wins buy you credibility.
• Weeks 6 to 10: build one guardrail. Add a CI check, a secrets scanner, or a secure-by-default library that prevents a whole bug class going forward. Automation scales better than your review queue ever will.
• Weeks 10 to 13: make it routine. Stand up a lightweight threat-model step for new features, an incident runbook, and a simple way for engineers to ask you questions. You want to be a multiplier, not a gate.

The first security hire who slows everyone down gets ignored. The one who makes the secure path the fast path gets pulled into every design review.

This is also what you talk about in interviews. When a founder asks how you would approach their first 90 days, an answer like the one above (map, fix the worst, automate, make it routine) signals that you understand a startup cannot afford a heavyweight security program. For more on reading the people side of the team, see questions to ask in a startup interview.