Hudson River Trading Quantitative Developer Interview Guide

The short answer: Hudson River Trading (HRT) has no Quantitative Developer title. The quant developer match is its engineering side: Software Engineer – C++ in Core Development, campus Software Engineers who interview in C++ or Python, Research Engineers and Algo Software Engineers. Algorithm Developer is HRT's quant research and trading role and overlaps this one only in its coding-heavy research work. HRT publishes the engineering stages: a timed coding test, one or two phone screens and a full day of onsite interviews on coding, debugging, technical design and team fit. HRT prohibits AI tools in interviews and assessments unless it says otherwise. Last reviewed October 2026.

Hudson River Trading quantitative developer interview: quick answers

The Hudson River Trading quantitative developer role

What Hudson River Trading quantitative developers work on, the skills its job postings ask for, and what a week can look like. Hudson River Trading posts the role as Software Engineer – C++ (Core Development), Software Engineer (C++ or Python) for new grads, and Research Engineer; Algorithm Developer is the research-leaning path.

Hudson River Trading quantitative developer levels and pay

Your level sets the bar you are interviewed against and the pay band of the offer.

HRT publishes no level ladder. Postings separate campus roles (2027 Grads, 2027 PhDs and internships) from experienced roles, such as Software Engineer – C++ at 1 or more years, so the pay table uses posting titles.

Pay in Hudson River Trading's US job postings

HRT's postings list an annual base salary in US dollars. The 2027 new-grad postings list a flat base plus a sign-on and a discretionary bonus.

Algorithm Developer, the quant research and trading role, posts the same $200K to $300K range (and a flat $300,000 for 2027 graduates) but is left out of the table. London and Singapore campus roles have local bases. Weekly intern pay is in the FAQ, and the Low Level (C++) postings in Hong Kong and Singapore show no range. Ranges seen October 29, 2026.

Hudson River Trading quantitative developer interview process

The engineering steps follow HRT's own blog posts on interviewing (2021 and 2025) and its student page. Candidate reports add detail on round content. The Algo Developer step comes from candidate guides only, since HRT publishes nothing on its round content.

Based on Hudson River Trading's own pages and candidate reports.

HRT asks you to apply to only one posting, considers applicants for all open positions and says to allow up to 2 weeks for review. It does not publish an overall timeline. Last reviewed October 2026.

What is different at Hudson River Trading

• The titles split by job. HRT has no Quantitative Developer title: Algo Developers own the models, and Software Engineers build the systems, including Core Development, Algo Software Engineers who work alongside Algo Developers, and Research Engineers. Algorithm Developer is filed as quant research and trading and covers statistical modeling, running models live and analyzing their daily performance, so it matches this role only on its coding-heavy research side. HRT's 2025 engineering interview post treats Algo Development as a separate job family.
• Engineering splits into Trading Tech and R&D. HRT says Trading Tech's biggest challenge is latency and R&D's is scale. Trading Tech is about 70% C++ and 30% Python, R&D about the reverse, with the same quality bar for both. Each has Acceleration groups embedded in trading teams and Platform groups building shared products, and engineers are encouraged to rotate.
• HRT avoids puzzles. It says it does not ask burst-of-insight or trick questions, and that a strong programmer from a competitive firm should be able to pass without studying. You may be asked to read code in a language you do not know.
• The AI rule is strict and enforced. Postings prohibit AI tools in interviews and assessments unless HRT says otherwise, and say HRT may end the interview, disqualify you or rescind an offer. HRT's engineering blog says later stages make cheating much harder and that it does not welcome cheating candidates to interview again. The 2021 blog allowed books and the internet as a language reference, which predates the current rule.
• Microseconds matter in Core Development. HRT describes its trading system as on the Pareto frontier of latency and throughput. C++ engineers build market data, order entry and execution infrastructure next to hardware specialists, and the software interfaces with FPGAs and ASICs.
• Everyone writes code. HRT expects engineers at every level, including engineering managers, to make individual technical contributions, and it ships every day.

Hudson River Trading quantitative developer interview questions

Questions from our bank, then practice prompts we wrote for this guide around Hudson River Trading's work.

1from typing import List, Tuple
2
3def process_feed(packets: List[Tuple[int, str]], start_seq: int, max_buffer: int) -> Tuple[List[str], List[Tuple[int, int]]]:
4    """Return delivered payloads in order and the list of skipped gaps."""
5    pass

1from typing import List, Tuple
2
3def process_feed(packets: List[Tuple[int, str]], start_seq: int, max_buffer: int) -> Tuple[List[str], List[Tuple[int, int]]]:
4    expected = start_seq
5    buffer = {}  # seq -> payload for packets that arrived early
6    delivered, gaps = [], []
7    for seq, payload in packets:
8        if seq < expected or seq in buffer:
9            continue  # old or duplicate
10        if seq == expected:
11            delivered.append(payload)
12            expected += 1
13        else:
14            buffer[seq] = payload
15            if len(buffer) > max_buffer:
16                first = min(buffer)
17                gaps.append((expected, first - 1))
18                expected = first
19        while expected in buffer:  # drain packets that are now in order
20            delivered.append(buffer.pop(expected))
21            expected += 1
22    return delivered, gaps
23
24# Complexity: O(n * b) time in the worst case, where b = max_buffer, because of min(); a heap makes the
25# skip O(log b). O(b) extra space for the buffer.

How to prepare

A plan for the Hudson River Trading loop, most important first:

1. Choose C++ or Python for your interviews, then practice coding and debugging in it daily, including reading code you did not write.
2. Review systems fundamentals in depth: memory, pointers and references, I/O, processes and OS internals.
3. Take timed coding tests and write your own corner-case tests, since HRT says the sample tests are incomplete.
4. Practice low-level C++ pieces such as a pool allocator, a ring buffer and an order book, and explain their performance.
5. Rehearse thinking out loud and explaining technical work to non-experts, which HRT asks for.
6. If you are applying as an Algorithm Developer, add expected value and probability questions and quick Python simulations.

Practice path

Courses that cover the rounds above:

• Modern C++
• Data Structures and Algorithms
• Trading Systems Design
• System Design
• Probability for Quant Interviews