The fastest way to hire full stack engineers without the agency tax.
Full stack engineers thrive in product-led teams - building features from database schema to UI, and owning quality at every layer.
Haystack matches you with full stack developers across React + Node, TypeScript, Python, Rails and more, each verified and actively exploring opportunities.
Full Stack Engineers ready to interview
A sample of full stack engineers currently active on Haystack. Sign in to browse full profiles, see expected salaries, and start a conversation.
Salary benchmark for full stack engineers across UK, US and EU
Anchored to live Haystack data. London, Berlin tech hubs and US coastal markets skew toward the upper bound.
GBUnited Kingdom · GBP · base salary
Junior · 0–3 yrs£45k–£60k
Mid · 3–6 yrs£65k–£90k
Senior · 6+ yrs£90k–£130k
DEGermany · EUR · base salary
Junior · 0–3 yrs€50k–€70k
Mid · 3–6 yrs€75k–€100k
Senior · 6+ yrs€105k–€150k
USUnited States · USD · base salary
Junior · 0–3 yrs$65k–$85k
Mid · 3–6 yrs$95k–$130k
Senior · 6+ yrs$130k–$190k
EUR and USD bands are indicative conversions from live UK data using current market multipliers. Local seniority, sector and equity packages can push offers higher.
What strong full stack engineers ship with
4 core · 4 nice to have
Core stack
TypeScriptReactNode.jsNext.js
Nice to have
PostgreSQLPythonRuby on RailsAWS
Hire full stack engineers by city
Explore localised salary benchmarks, top employers and live candidates in any of our 24 cities.
Use these across technical and behavioural rounds. Tap a card for what to listen for.
Q 01Tell me about a feature you shipped end-to-end - from schema to UI. What trade-offs did you make?What to listen for
Listen for: structured problem framing, trade-off awareness, specific metrics, and ownership beyond the code.
Q 02How do you split work and ownership between front end and back end when you're the only engineer on a feature?What to listen for
Listen for: structured problem framing, trade-off awareness, specific metrics, and ownership beyond the code.
Q 03Walk me through your testing approach across the stack.What to listen for
Listen for: structured problem framing, trade-off awareness, specific metrics, and ownership beyond the code.
Q 04Where do you usually find yourself strongest - front end, back end, or infra - and how do you stretch in the others?What to listen for
Listen for: structured problem framing, trade-off awareness, specific metrics, and ownership beyond the code.
Hiring through Haystack takes days, not months
A repeatable five-step playbook our employers run for every role.
Day 0
Book a chat
A short call and we set up the role with you.
Day 1
Applicants within hours
We advertise the role and our AI sources people who fit.
Day 2–10
Interview rounds
We handle scheduling. You focus on the conversation.
Day 10–14
Offer & references
We support both sides through offer and reference checks.
Day 14–21
Onboard
Structured ramp template so your new hire ships in week one.
92%
Offer acceptance. Because every candidate has already aligned on level, comp and working pattern before you meet, full stack engineer offers via Haystack are accepted 92% of the time.
The full stack engineer hiring playbook
Full Stack Engineer specialist or generalist - which should you hire?
The honest answer depends on the half-life of your full stack engineer surface area. If you expect to keep investing in TypeScript and React work over the next 18-24 months, a specialist full stack engineer will out-deliver a generalist on day-30 throughput and stakeholder confidence.
If your team is under ten people, or full stack engineer responsibilities are spread across two or three roles already, hire a strong generalist who has shipped this work in anger at least twice. The cross-disciplinary pattern recognition will pay for itself the first time priorities collide.
On Haystack we surface both - filtered by whether the candidate self-identifies as a full stack engineer specialist and verified against their last two roles. Expect to pay around £65k–£88k for a mid-level UK hire, scaling toward £90k–£130k for senior.
What strong full stack engineers actually bring
A great full stack engineer is not the one with the longest CV - it is the one who has owned a hard TypeScript call and changed how they work because of how it landed. Across the engineering hires we have placed in 2025-2026, the same patterns keep showing up.
A written 30/60/90 plan in week one, anchored to TypeScript delivery milestones rather than ramp-up vanity metrics.
An opinion on what NOT to do with React, backed by an example where adding it would have hurt the team.
Full Stack Engineers who pair TypeScript depth with cross-functional fluency - they bring product, design and data into their decisions, not just engineering.
Active mentorship of at least one other full stack engineer or adjacent role - usually a junior - within the first quarter.
Red flags when interviewing full stack engineers
Every discipline has its own pattern of plausible-sounding answers that fall apart in production. For full stack engineers, these are the patterns that most often correlate with a six-month regret hire on the employer side.
Blames previous teams for failed TypeScript work without explaining what they personally shipped to mitigate it.
Cannot name a single full stack engineer project where they removed scope rather than added it.
Defines "senior full stack engineer" purely by years of experience, not by the scope of decisions they own.
Lists TypeScript on the CV but cannot describe a single trade-off they hit in production - all framework, no friction.
A sample take-home for full stack engineer candidates
When teams ask us how to evaluate a full stack engineer beyond a CV and a chat, we recommend a 90-minute paid take-home that mirrors real work, not a trivia quiz. The brief below is one we have refined with employers hiring across engineering teams.
Give the candidate a small, intentionally imperfect artefact tied to "own features from spec to production". Their task is to add a second capability - tied to "build and consume apis across the stack" - while keeping existing behaviour intact. Then grade in three parts.
Correctness: the new work satisfies the brief and at least one edge case the candidate flags themselves.
Judgement: did they refactor, wrap or work around the existing imperfection? Any of the three is fine - we are listening for the reasoning, not the verdict.
Communication: a short written note explaining what they would do differently with another week, what they noticed about TypeScript, React and Node.js, plus working exposure to Next.js, PostgreSQL and Python, and the assumptions they made along the way.
What to expect in the first 30 days from a Haystack full stack engineer hire
By week one, the new full stack engineer should have shipped a small, low-risk artefact to production or a stakeholder - a docs fix, a small process change, a first review on someone else's work. The goal is to validate the loop, not to ship anything heroic.
By week two, the full stack engineer is shadowing the active workstreams, attending standups in observe-mode, and asking pointed questions about why specific decisions were made. If they are not asking those questions, the hire is going to plateau.
By day 30, they own one cleanly-scoped slice of the full stack engineer surface area, have published a public ramp-up doc, and are the named point of contact for stakeholders inside that slice. Every Haystack employer gets a structured onboarding template, so you are not reinventing the playbook each hire.
Leading tech employers use Haystack to hire world-class candidates
For anyone in the industry struggling with tech hiring and finding those really niche candidates, I'd highly recommend using Haystack. Ultimately Haystack helped us find great candidates that we couldn't find anywhere else.
Working with Haystack has helped us widen our brand, it's helped us recruit great people, and it's been an easy thing to do. When we think about our candidate experience and the experience of people in my team, I want that rounded experience and that's what we've seen with Haystack.
I'm really impressed with the candidates that I'm finding on Haystack, I'm looking at them and thinking, 'wow, this looks like a great engineer'. We made multiple hires in our first year. It's been a really nice way to hire tech talent, with a very unique approach.
Haystack verifies full stack engineers as people who genuinely ship across the stack - not specialists labelling themselves full stack. Profiles show recent work on both front end and back end with verified skills on each side.
How long does it take to hire a full stack engineer through Haystack?
Most employers book first-round interviews within 48 hours of going live and complete hires in under 21 days. Full Stack Engineers on Haystack are actively exploring roles, so response rates are dramatically higher than cold outreach.
Do candidates work remotely, hybrid, or on-site?
Every candidate sets their own working-pattern preferences (fully remote, hybrid, or on-site) and the location radius they'll consider. You can filter for the working pattern that suits your team before sending a single message.
What does Haystack charge?
Haystack offers two options: a flat subscription with unlimited hires, or a pay-on-success model with no upfront cost. See the pricing page for current plans - there are no hidden agency fees.
Related roles & guides
Stay inside the Haystack network - every link is interview-ready.
TypeScript
React
Node.js
Next.js
PostgreSQL
Python
Ruby on Rails
AWS
