Gelber Group Interview Guide: Trading and Technology Roles

A Chicago Prop Firm That Still Trades Its Own Capital

Brian and Frank Gelber founded Gelber Group as a brokerage on the Chicago Board of Trade floor in 1982. Fifteen years later they left the floor and turned the firm into a proprietary screen-trading business. Brian Gelber, now CEO, still appears in the firm's public story as a trader who mentors rising talent.

Gelber reports more than 200 employees, with offices in Chicago, White Plains and Amsterdam. It is privately funded and trades its own capital across foreign exchange, fixed income, equities and commodities. That is a different commercial conversation from a hedge fund raising outside money.

The interesting brief is the mix. Gelber still hires experienced discretionary traders, runs an algorithmic group that says it owns the full lifecycle from idea to live operation, and publishes a named competition, theBreakout, for remote futures and FX traders. Current openings lean towards experienced traders and technical operations. The mix changes. There is no published standard graduate-trader loop, no mandatory market-making game, and no official four-to-six-round timetable.

Three Different Routes into Gelber

Experienced trading vacancies

Gelber's current careers page lists roles such as experienced energy, foreign-exchange, equity, equity-options and macro traders. The adverts emphasise trading ideas, technology, entrepreneurship, collaboration and competitive profit splits. For these seats, the interview should be expected to turn on an actual strategy and record rather than undergraduate puzzles.

Prepare a clean account of the mandate: instruments, holding period, gross and net risk, capacity, worst drawdown, technology dependency and where returns came from. Separate audited or broker-verifiable figures from estimates. If a record belongs to a former employer, respect confidentiality and describe the process without taking data or intellectual property.

Gelber is a proprietary trading firm, not a hedge fund accepting outside investors. Our hedge fund versus proprietary trading guide explains why that changes the commercial conversation. A trader is asking Gelber to allocate its own capital, infrastructure and risk budget to a business the trader can run.

theBreakout

Gelber also publishes a genuinely firm-specific route called theBreakout. It is an eight-week remote simulated futures and FX competition with $25,000 in cash prizes and potential employment consideration. The firm explicitly says it assesses both trading statistics and qualitative traits, so the highest P&L is not automatically the preferred candidate.

That is an official process for that programme only. It should not be generalised to software, experienced-trader or other vacancies. A candidate entering it should clarify the current rules, instruments, risk limits, data policy and evaluation window on the programme page.

Algorithmic and technology work

Gelber's trading page says its algorithmic group combines software engineers, traders and researchers. Its leadership page describes proprietary platforms for backtesting, algorithmic trading and risk management, with strategies from medium to high frequency across major futures and securities markets.

That public description supports preparation around research-to-production ownership. It does not prove that every developer interview uses C++, FIX, ITCH, lock-free structures or kernel bypass. Use the vacancy to choose the language and systems topics.

What Candidate Reports Can and Cannot Tell You

Gelber does not publish a company-wide sequence of recruiter call, assessment, technical interview and onsite. Third-party sites aggregate small numbers of reports for individual internships, but their labels and future-dated entries are not strong enough to establish a current standard. We have therefore not reproduced their "real questions".

Candidate reports may still help with one narrow task: identifying possibilities to confirm with recruitment. Ask:

• Is the first conversation with recruitment, the desk or a hiring manager?
• Is there a live technical exercise, a take-home or a trading simulation?
• For a trader, what evidence may be presented without breaching a former employer's confidentiality?
• For an engineer, which language and part of the trading stack will be assessed?
• Will the role sit in Chicago, White Plains, Amsterdam or another arrangement stated in the advert?

A role advert is authoritative about the current vacancy. Gelber's site is authoritative about its business and named programmes. Anonymous recollections are neither.

Preparing Evidence for Different Roles

An experienced trader should build a strategy memorandum that can be discussed without taking confidential material from a former employer. Cover economic or behavioural rationale, instruments, horizon, data dependency, execution, risk limits and capacity. Reconcile gross research returns with realised net performance where evidence is available. If figures cannot be independently shared, say so and focus on the decision process. A polished Sharpe ratio with no explanation of costs, drawdowns or changing market conditions is not enough to justify an allocation.

Discretionary and systematic traders should not force their records into the same format. A discretionary candidate can show repeatable preparation, scenario construction, review notes and adherence to limits even when the sample of trades is small. A systematic candidate should show point-in-time research, parameter discipline and how the model moves from backtest to monitored production. Both should explain when human intervention is permitted and how they distinguish a broken thesis from normal loss.

Engineers and technical-operations candidates need a different evidence pack. Select one incident or system and identify the trading consequence: stale state, rejected orders, uncontrolled exposure, slow recovery or impaired research. Explain detection, containment, communication and prevention. A low-latency candidate may need detailed performance reasoning; an operations candidate may need exchange sessions, monitoring and escalation. The vacancy, not Gelber's broad algorithmic description, decides the balance.

Applicants to theBreakout should treat simulation results as a research record. Keep notes on each position's premise, intended risk and any rule change. Review whether returns came from a repeatable process or one uncontrolled exposure. Because Gelber explicitly mentions qualitative traits, the ability to follow the framework and explain a mistake may matter alongside the leaderboard, although the firm does not publish a scoring formula.

What Gelber May Be Evaluating

Gelber does not provide a company-wide interview rubric. The following criteria are explicit inferences from its proprietary-capital model, current adverts, algorithmic lifecycle and theBreakout description.

• Capital judgement: can the candidate connect expected return with drawdown, liquidity, capacity and the amount of firm capital at risk?
• Repeatability: is the edge described as a process that can be monitored, or only as a favourable historical result?
• Operational ownership: can the candidate keep research, code and live trading aligned and respond safely when they diverge?
• Entrepreneurship with controls: can someone build a trading business while accepting limits, review and shared infrastructure?
• Collaboration: can traders, researchers, engineers and operations staff exchange challenges without obscuring responsibility?
• Learning under loss: does the candidate update a model or thesis using evidence rather than merely reducing risk after P&L turns negative?

Make those qualities visible in how you answer. Start with the intended edge, identify the scarce resource and name the largest failure mode. For a trading proposal, that resource may be capital, liquidity or engineering effort. For an incident, it may be time before exposure becomes uncontrolled. Quantify where possible, but never invent precision to cover missing evidence.

Firm-Specific Practice

These are our practice prompts, inferred from Gelber's published businesses. They are not claimed as past interview questions.

Experienced trader: Your strategy's Sharpe is stable but its capacity estimate doubles after a change in execution model. Which assumptions would you challenge before requesting more capital? Cover fill probability, impact, crowding and stress liquidity.

Discretionary futures trader: Present one trade with entry, time horizon, catalyst, risk limit and the observation that proves the thesis wrong. Then explain how you would respond if P&L is positive for the wrong reason.

Algorithmic researcher: A backtest performs well in several futures contracts but fails after realistic roll and fee treatment. How would you decide whether to repair or abandon it?

Software engineer: A market-data gap causes a strategy to trade on stale state. Design detection, containment and recovery. Explain what should happen to open orders while confidence in the book is impaired.

Technical operations: An exchange session drops during a volatile market. Set out the first five checks, the escalation path and the evidence needed before re-enabling trading.

theBreakout participant: Two simulations have identical returns, but one repeatedly breaches its intended risk and recovers. Which should receive capital? Gelber's programme explicitly evaluates qualitative traits as well as P&L, so process discipline belongs in the answer.

For foundational practice, use our options market-making guide or mental-maths drills only where they match the role. Gelber's public materials do not say every trader is an options market maker or that every applicant sits a speed-arithmetic test.

Frequently Asked Questions

Does Gelber run a standard online assessment?

No official page describes one for all candidates. An assessment may be used for a particular role, but the format should be confirmed from the vacancy or recruiter. The eight-week theBreakout competition is a separate, named programme.

Is Gelber mainly an options firm?

No. The firm officially lists foreign exchange, fixed income, equities and commodities. Current vacancies include equity options but also energy, FX and macro trading.

Does Gelber hire only experienced traders?

The current vacancy mix is weighted towards experienced seats. Gelber has also advertised internships at times, and theBreakout is a separate, named route. That competition is currently described as open to US residents aged 21 or over with roughly one to two years of profitable trading experience. The careers page and programme page are the current sources.

What is distinctive about its algorithmic work?

Gelber says its algorithmic group owns the process from research through deployment and operation, and trades from medium to high frequency. That makes end-to-end judgement more relevant than claiming knowledge of one private technology stack.

How should candidates discuss pay?

Use the live advert and recruiter. Gelber describes competitive profit splits for some experienced-trader roles, but it does not publish a universal graduate base or partner package. Any total depends on the seat, capital allocation, performance, expenses, location and contract.

How can I assess whether Gelber is a good fit?

Ask what capital, markets and infrastructure the seat can access, who owns risk decisions and how economics change as a strategy grows. A proprietary setting can align resources closely with trading results, but it can also make capacity, drawdown and technology costs central to the role. Experienced traders should understand the path from an idea to additional allocation. Engineers should ask whether they own a shared platform or work directly with one strategy. Candidates who prefer a fixed functional boundary may value a different environment from those who want end-to-end responsibility.

The useful Gelber question is not "Which puzzle will appear?" It is "Which trading business is this role expected to build or support?"