Third Chair
Automating complex legal workflows with human lawyers in the loop.
Senior Software Engineer (Backend)
About the role
What makes you a good fit:
• 4+ years of professional work experience developing production level Node.js or Go backends.
• Strong experience with relational DBMSs like PostgreSQL and AWS services such as ECS, RDS, Lambda functions, CloudWatch, Elasticache etc.
• Strong understanding of System Design principles for production-grade enterprise systems.
• Well integrated with AI coding tools like Claude, Codex etc.
• Comfortable with US timezones.
What makes you a great fit:
• Past experience with OpenAI APIs for completions, function calling and building context aware assistants.
• Proven experience working with very large datasets and high-throughput systems and working with OLAP databases like Redshift.
• Strong sense of cost optimization strategies, system design, and building efficient API stacks.
• Building multi-agent systems using frameworks like CrewAI or such.
Benefits:
• Work from anywhere - We're a distributed team across multiple timezones with a focus on outputs instead of location or working hours.
• Generous PTO policy.
• Competitive pay bracket.
• Equity at a fast growing YC backed co in a disruptive market.
Please read before applying:
• Please include a note where you answer in not more than 100 words: ‘What is the most complex backend feature you’ve developed where you were the sole or primary developer. Mention the technical details, peak production load etc.’
• Applications that don’t include the note or meet the minimum requirements will not be considered.
• We review every application and have not more than 4 rounds in the process with a decision within 14 days of applying.
About the interview
- Round 1 (15 mins): Knockout round covering background, role relevance, and a few essential technical questions.
- Round 2 (45 mins): Hands-on programming interview; problem solving and code quality. All AI coding tools allowed!
- Round 3 (45 mins): System design discussion with hands-on work focused on building production-ready systems.
- Round 4: HR round covering culture fit, expectations, and alignment.
About Third Chair
Third Chair (YC X25) builds AI-powered legal infrastructure with human lawyers in the loop, helping rightsholders turn complex legal workflows into scalable revenue. We’re founded by two second-time YC founders with prior exits—Yoav previously co-founded Trendpop (YC W21), which scaled to $1M ARR in 16 months processing millions of social posts per day, and Shourya previously co-founded Fello (YC W22), which grew to 2M+ users, processed millions in investments, and raised $4M+. Backed by Y Combinator and FundersClub with $2.3M raised, customers used Third Chair to generate over $1M in revenue in the last six months of 2025.
