Staff Full Stack Engineer (Sell Side Engine)

Tem-Energy Limited; United Kingdom; Remote; GBP 90,000 - 125,000; Full time

Job summary

Tem-Energy Limited is hiring a Staff Software Engineer to join Origination & New Products, a new three-person squad inside Sell Side Growth. The role focuses on architecture-level decisions for integration-heavy systems and hands-on delivery across the backend stack.

You will work in a Python/AWS serverless environment with exposure to React/TypeScript frontend work when required, collaborating with Rosso, Data, and Billing to scale the platform.

Qualifications

• Proven track record as senior/Staff engineer in a fast-paced product environment.
• Ownership of architecture decisions on integration-heavy systems.
• Strong problem-solving and systems design abilities.

Responsibilities

• Own architecture-level decisions on integration-heavy systems across multiple teams.
• Build and ship backend with Python and AWS serverless stack.
• Collaborate with Rosso, Data, and Billing teams to ensure smooth integrations.
• Occasional frontend work in React/TypeScript when it matters.
• Maintain high code quality through reviews and testing.

Skills

Backend architecture

Python

AWS serverless

Event-driven design

React/TypeScript exposure

Ambiguity handling

Cross-team collaboration

Mentoring engineers

Startup/fast-paced delivery

Regulated domain experience (energy/fi

Tools

Rosso

Control Room

Pricing engine

Job description

Requirements

• Deep technical depth in backend and systems design, with a track record of owning architecture-level decisions on complex, integration-heavy systems
• Comfortable in our core stack: Python, AWS serverless (Lambda, API Gateway, DynamoDB, EventBridge), and event-driven architectures. React/TypeScript exposure is a plus but not the bar
• Comfort operating without a full spec: able to take a defined slice of an ambiguous problem and turn it into a shippable plan
• Experience delivering work where a critical dependency sits with a team you have no authority over
• Proven product delivery experience: experience as a Full Stack or Backend Engineer in a startup or fast-paced product environment, with ownership of complex projects from start to finish
• (Desirable) Prior experience mentoring engineers or setting technical direction, even without a formal leadership title. Not required. We’d rather have a brilliant engineer who has never led a squad than a mediocre one who has
• (Desirable) Experience in energy, fintech, or another regulated, high-stakes commercial domain
• (Desirable) Exposure to workflow orchestration, event-driven systems, or real-time pricing engines
• (Desirable) Experience originating new product lines from scratch rather than only scaling existing ones

What the job involves

• We're hiring a Staff Software Engineer to join Origination & New Products, a new three-person squad inside Sell Side Growth
• Sell Side Growth originates, contracts, and retains the renewable generators whose volume powers our platform - without generators, there's no product
• The engine is scaling fast, and much of the manual process underneath today's pipeline - tendering, contracting, onboarding - needs to be rebuilt to handle that growth rather than buckle under it
• This is a deep, hands-on IC role, not a squad-lead one - that's owned by the Staff/Senior Staff engineer leading the initiative
• You're free to go all-in on the hardest technical problems: integration with Rosso (our pricing and settlement engine), Control Room (our core tendering and pipeline platform), and the deal-gating risk tooling that lets us take on genuinely new categories of commercial risk safely
• We're not hiring for leadership polish here
• We're hiring a ridiculously good engineer
• Go deep on hard systems: Own architecture-level decisions on integration-heavy systems, reasoning clearly about boundaries, contracts, and failure modes
• Build for ambiguity: Take a piece of an undefined, commercially-driven problem and turn it into a shippable plan, within the direction your squad lead sets
• Work across boundaries: Deliver on dependencies that sit with teams you have no authority over, such as Rosso, Data, and Billing, getting integrations right without needing to own the relationship
• Build with impact: Design, build, and ship the hardest parts of the new-product build sequence yourself, backend-first but comfortable moving into the React/TypeScript front end when it matters
• Maintain high standards: Write clean, well-tested code, contribute to code reviews, and help improve team practices and documentation
• ---In your first 12 months, you might:
• Own architecture-level decisions on the integration-heavy systems connecting Origination & New Products to Rosso, Data, and Billing
• Help ship the first new product category live and generating qualified pipeline within 6 months
• Help solve the tendering automation problem that currently limits how much volume the team can quote on - one of the highest-leverage levers for supporting our growth
• Contribute to productising a currently manual, error-prone pricing process that's already turning away large, complex deals
• Design deal-gating risk tooling for commercial risk categories that don't exist yet at tem, within our React/TypeScript and Python/AWS serverless stack